diff --git a/‎.changeset/21405-permission-denied-status.md‎
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diff --git a/‎packages/plugins/plugin-security/src/errors.test.ts‎
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diff --git a/‎packages/plugins/plugin-security/src/errors.ts‎
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diff --git a/‎packages/runtime/src/domains/share-links-enforcement-context.test.ts‎
Lines changed: 143 additions & 14 deletions b/‎packages/runtime/src/domains/share-links-enforcement-context.test.ts‎
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@@ -0,0 +1,9 @@
+---
+'@objectstack/plugin-security': patch
+---
+
+`PermissionDeniedError` declares its 403 as `status` as well as `statusCode`, so a permission refusal answers 403 at every door (#21405).
+
+Clause-②: no
+
+The class declared `statusCode` alone, unlike every other error class in `errors.ts`, and a door that reads `status` alone derived no status from it. On a showcase boot, a plain member's `POST /api/v1/share-links` on a record they cannot read answered `500` with code `PERMISSION_DENIED` through `plugin-sharing`'s route door, while the runtime dispatcher's `/share-links` domain answered the same refusal with `403`. Both doors now answer `403 PERMISSION_DENIED`. The code, the message and `statusCode` are unchanged.
@@ -0,0 +1,86 @@
+// Copyright (c) 2026 ObjectStack. Licensed under the Apache-2.0 license.
+
+/**
+ * Every error class `errors.ts` exports declares its HTTP status under BOTH
+ * spellings, `status` and `statusCode`, with equal values.
+ *
+ * The rule is the module's own ("Why each carries BOTH `status` and
+ * `statusCode`"): the doors read different property names, so a class that
+ * declares one spelling answers a status at the doors that read it and
+ * nothing at the doors that read the other. `PermissionDeniedError` was that
+ * class — `statusCode` alone — and `plugin-sharing`'s share-link route door,
+ * which reads `status`, answered its 403 refusal as a 500. Its two-door pin is
+ * the `[#21405]` block of
+ * `packages/runtime/src/domains/share-links-enforcement-context.test.ts`.
+ *
+ * The population is ENUMERATED from the module's exports, never listed by
+ * hand, so a class added later is held to the rule the day it lands. The floor
+ * below is what keeps the enumeration from passing over nothing: it names the
+ * classes the module exports today and fails if any of them is not found.
+ */
+
+import { describe, expect, it } from 'vitest';
+import * as errorsModule from './errors.js';
+import { PermissionDeniedError } from './errors.js';
+
+type ErrorClass = new (...args: unknown[]) => Error;
+
+/** The exported values that are `Error` subclasses, by export name. */
+const ERROR_CLASSES: Array<[string, ErrorClass]> = Object.entries(errorsModule)
+  .filter(([, value]) => typeof value === 'function' && value.prototype instanceof Error)
+  .map(([name, value]) => [name, value as unknown as ErrorClass]);
+
+/**
+ * The classes the module exports today. A floor, not the population: a new
+ * class is checked without being added here.
+ */
+const FLOOR = [
+  'PermissionDeniedError',
+  'MasterDetailRelationMissingError',
+  'DetailRecordNotFoundError',
+  'MasterReferenceMissingError',
+  'MaskedValueWriteError',
+  'PermissionSetReadUnansweredError',
+  'ExplainObjectNotFoundError',
+  'PermissionSetNameConflictError',
+];
+
+/**
+ * One argument list every class here accepts. Each constructor reads its
+ * parameters as text (interpolated, or through `String()`) or as a list
+ * (`join`, spread), and a one-element array serves as both.
+ */
+const ARGS: unknown[] = [['a'], ['b'], ['c'], ['d']];
+
+describe('errors.ts — every exported error class declares status and statusCode, equal', () => {
+  it('the enumeration finds every class the module exports today', () => {
+    expect(ERROR_CLASSES.map(([name]) => name)).toEqual(expect.arrayContaining(FLOOR));
+  });
+
+  it('each one carries both spellings, with equal numeric values', () => {
+    const violations: string[] = [];
+    for (const [name, ErrorClass] of ERROR_CLASSES) {
+      let instance: Error & { status?: unknown; statusCode?: unknown };
+      try {
+        instance = new ErrorClass(...ARGS);
+      } catch (e) {
+        violations.push(`${name}: cannot be constructed from the shared argument list (${String(e)})`);
+        continue;
+      }
+      const { status, statusCode } = instance;
+      if (typeof status !== 'number' || typeof statusCode !== 'number') {
+        violations.push(`${name}: status=${String(status)} statusCode=${String(statusCode)} — declare both`);
+      } else if (status !== statusCode) {
+        violations.push(`${name}: status ${status} !== statusCode ${statusCode}`);
+      }
+    }
+    expect(violations).toEqual([]);
+  });
+
+  it('PermissionDeniedError answers 403 under both spellings', () => {
+    const e = new PermissionDeniedError('[Security] Access denied: read on crm_account');
+    expect(e.code).toBe('PERMISSION_DENIED');
+    expect(e.status).toBe(403);
+    expect(e.statusCode).toBe(403);
+  });
+});
@@ -24,9 +24,23 @@ import { unresolvedPostureRemedy } from './unresolved-posture.js';
  * positions and permission sets must not travel that way — see the throw site
  * in `security-plugin.ts` and the measurement recorded in
  * `permission-denied-user-copy.test.ts`.
+ *
+ * ## Both `status` and `statusCode`, like every class in this file
+ *
+ * This class used to declare `statusCode` alone — the only class here that
+ * did — so a door that reads `status` alone derived no status from it.
+ * Measured on a showcase boot: a plain member's `POST /api/v1/share-links` on
+ * a record they cannot read answered `500 PERMISSION_DENIED` through
+ * `plugin-sharing`'s share-link route door (`err?.status ?? 500`), and `403`
+ * through the runtime dispatcher's `/share-links` domain, for the same throw.
+ * The class now carries both spellings with equal values, for the reason the
+ * note below gives its siblings, so a door that reads either one answers
+ * `403`. `errors.test.ts` holds every error class this module exports to that
+ * rule.
  */
 export class PermissionDeniedError extends Error {
   readonly code = 'PERMISSION_DENIED';
+  readonly status = 403;
   readonly statusCode = 403;
   readonly details?: Record<string, unknown>;
   /**
@@ -61,12 +75,16 @@ export class PermissionDeniedError extends Error {
  *
  * ### Why each carries BOTH `status` and `statusCode`
  *
- * The two transports read different property names, and this gate throws on the
- * DATA path, which reaches both: `@objectstack/rest`'s `mapDataError` passes a
- * domain error through on `.status` alone, while the runtime dispatcher's
- * `errorFromThrown` reads `.status` then falls back to `.statusCode`. Declaring
- * one spelling would leave the other transport deriving a status from nothing —
- * which is the defect this split exists to remove, reintroduced at the edge.
+ * The doors read different property names, and this gate throws on the DATA
+ * path, which reaches all of them. `status` is the spelling every door reads
+ * first, and some read nothing else: `plugin-sharing`'s share-link route door
+ * (`err?.status ?? 500`), and the sandbox boundary, whose passthrough list
+ * carries `status` and not `statusCode` (`SANDBOX_ERROR_PASSTHROUGH` in
+ * `runtime/src/sandbox/quickjs-runner.ts`). The runtime dispatcher's
+ * `errorFromThrown` and `@objectstack/rest`'s `mapDataError` read `.status`
+ * then fall back to `.statusCode`. Declaring one spelling would leave a door
+ * that reads the other deriving a status from nothing — which is the defect
+ * this split exists to remove, reintroduced at the edge.
  *
  * ### Why none of them starts with `[Security] Access denied`
  *
@@ -412,10 +430,9 @@ export const PERMISSION_SET_NAME_CONFLICT_STATUS = 409;
  *
  * ## Why BOTH `status` and `statusCode`
  *
- * The same reason every class above records: the two transports read different
- * property names (`mapDataError` passes a domain error through on `.status`;
- * the runtime dispatcher's `errorFromThrown` reads `.status` then falls back to
- * `.statusCode`), and this throws on the DATA path, which reaches both.
+ * The same reason every class above records: the doors read different property
+ * names (see "Why each carries BOTH `status` and `statusCode`" above), and this
+ * throws on the DATA path, which reaches them all.
  *
  * The message is byte-identical to the bare `Error`'s — the wording was never
  * the defect, and the flat door's 4xx arm ships it verbatim.
 
@@ -52,8 +52,9 @@ import { PermissionSetSchema } from '@objectstack/spec/security';
 import type { PermissionSet } from '@objectstack/spec/security';
 import type { ExecutionContext } from '@objectstack/spec/kernel';
 import { SHARE_LINK_SERVICE } from '@objectstack/spec/contracts';
+import type { IHttpRequest, IHttpResponse, IHttpServer, RouteHandler } from '@objectstack/spec/contracts';
 import { PermissionDeniedError, SecurityPlugin } from '@objectstack/plugin-security';
-import { ShareLinkService } from '@objectstack/plugin-sharing';
+import { ShareLinkService, registerShareLinkRoutes } from '@objectstack/plugin-sharing';
 import { ApiErrorSchema, BaseResponseSchema, envelopeViolations } from '@objectstack/spec/api';
 import { BUILTIN_OPERATION_MESSAGES } from '@objectstack/spec/system';
 import { apiErrorResponse } from '../error-envelope.js';
@@ -133,8 +134,8 @@ const EAST_VIEWER: PermissionSet = PermissionSetSchema.parse({
  * withholds read. This set is therefore wired as BOTH the caller's explicit set
  * and the fallback in the #6649 cases below: `allowCreate` alone, so
  * `checkObjectPermission('find', 'crm_account', …)` is false and the security
- * middleware throws `PermissionDeniedError` — the `statusCode`-only shape whose
- * status the domain used to drop.
+ * middleware throws `PermissionDeniedError` — the shape whose status the domain
+ * used to drop, because it declared `statusCode` alone until #21405.
  */
 const ACCT_NO_READ: PermissionSet = PermissionSetSchema.parse({
     name: 'acct_no_read',
@@ -550,6 +551,11 @@ describe('[#6551] the dispatcher seam itself', () => {
  * which reads `status` OR `statusCode`. These cases assert `status` AND `code`
  * together on purpose: a denial arriving as 403 under the wrong code would be
  * just as wrong as the 500, and only the pair separates them.
+ *
+ * [#21405] The paragraphs above describe the class as #6649 found it. It now
+ * carries `status` beside `statusCode`, which is what fixed the OTHER door, and
+ * the shared-catch case below keeps a `statusCode`-only throw so this catch's
+ * second channel stays pinned.
  */
 
 /** The ADR-0112 envelope checks every case below shares. */
@@ -635,17 +641,26 @@ describe('[#6649] a security-middleware refusal keeps its own status through the
         expect(expectDeclaredEnvelope(res).code).toBe('PERMISSION_DENIED');
     }, 30_000);
 
-    it('the catch is shared, so list and revoke answer the statusCode-only refusal identically', async () => {
-        // Driven with a service double raising the REAL `PermissionDeniedError`
-        // (the production class, `statusCode` and no `status`), because what is
-        // under test here is the CATCH, not a second trip through the middleware.
-        for (const verb of ['GET', 'DELETE'] as const) {
-            const res = await refusalFromService(
-                new PermissionDeniedError(`[Security] Access denied: operation on object '${OBJECT}'`),
-                verb,
-            );
-            expect(res.status, `${verb} status`).toBe(403);
-            expect(expectDeclaredEnvelope(res).code, `${verb} code`).toBe('PERMISSION_DENIED');
+    it('the catch is shared, so list and revoke answer the refusal identically — the production class and a statusCode-only throw', async () => {
+        // Driven with a service double, because what is under test here is the
+        // CATCH, not a second trip through the middleware. Two throws: the REAL
+        // `PermissionDeniedError`, and a `statusCode`-only twin of the shape that
+        // class had until #21405. The class now carries `status` beside
+        // `statusCode`, so it no longer reaches the catch's `statusCode` channel
+        // by itself; the twin keeps that channel pinned.
+        const throws = {
+            production: () => new PermissionDeniedError(`[Security] Access denied: operation on object '${OBJECT}'`),
+            statusCodeOnly: () => Object.assign(
+                new Error(`[Security] Access denied: operation on object '${OBJECT}'`),
+                { code: 'PERMISSION_DENIED', statusCode: 403 },
+            ),
+        };
+        for (const [shape, thrown] of Object.entries(throws)) {
+            for (const verb of ['GET', 'DELETE'] as const) {
+                const res = await refusalFromService(thrown(), verb);
+                expect(res.status, `${shape} ${verb} status`).toBe(403);
+                expect(expectDeclaredEnvelope(res).code, `${shape} ${verb} code`).toBe('PERMISSION_DENIED');
+            }
         }
     });
 
@@ -917,3 +932,117 @@ describe('[#14637] the dispatcher probe reads the standing policy before it answ
         expectIndistinguishable(await h.resolve(token, { password: 'hunter2' }), await h.resolve(UNKNOWN_TOKEN));
     });
 });
+
+/**
+ * [#21405] The SAME refusal through the OTHER door.
+ *
+ * `/share-links` has two doors. This file's subject is the dispatcher domain;
+ * `plugin-sharing`'s `registerShareLinkRoutes` is the other, and it is the one
+ * that serves `/api/v1/share-links` on the standalone server (the dispatcher
+ * plugin mounts no route for the path there). Both hand the caller's envelope
+ * to `ShareLinkService`, so one caller and one request reach one refusal, and
+ * the only thing left to differ is how each door's catch reads the throw's
+ * status.
+ *
+ * They differed. The plugin door's catch reads `err?.status ?? 500`, and
+ * `PermissionDeniedError` declared `statusCode = 403` with no `status`, so the
+ * #6649 refusal below — the CRUD gate's denial on `createLink`'s visibility
+ * read — answered 403 here and 500 there. Measured on a showcase boot as a
+ * plain member, `POST /api/v1/share-links` on a record they cannot read: 500
+ * `PERMISSION_DENIED` through the plugin door, 403 through this domain. The
+ * ruled fix is in the class: `PermissionDeniedError` carries `status` beside
+ * `statusCode`, as every sibling in `plugin-security/src/errors.ts` does, so
+ * no door's catch changes.
+ *
+ * ## What is real here
+ *
+ * Both doors, their production entries: `registerShareLinkRoutes` mounted on a
+ * route recorder, and `handleShareLinksRequest` over the dispatcher's own
+ * `errorFromThrown`. ONE engine double with the WHOLE `SecurityPlugin`
+ * middleware booted on it, ONE `ShareLinkService` over that engine, ONE
+ * envelope — so the throw each door catches is the middleware's own
+ * `PermissionDeniedError` from the same read, not a double's.
+ *
+ * ## Why create only
+ *
+ * The list's refusal (the member's read of `sys_share_link`) no longer
+ * reaches either door: the member's own list became a self-scoped read
+ * (#21328), and both doors force the creator filter to the caller. Measured on
+ * the showcase boot after that change: `GET /share-links` answers 200 through
+ * both doors.
+ */
+
+/** The smallest `IHttpServer` that keeps the handlers a registrar mounts. */
+class RouteRecorder implements IHttpServer {
+    readonly routes = new Map<string, RouteHandler>();
+    get(path: string, handler: RouteHandler) { this.routes.set(`GET ${path}`, handler); }
+    post(path: string, handler: RouteHandler) { this.routes.set(`POST ${path}`, handler); }
+    put(path: string, handler: RouteHandler) { this.routes.set(`PUT ${path}`, handler); }
+    delete(path: string, handler: RouteHandler) { this.routes.set(`DELETE ${path}`, handler); }
+    patch(path: string, handler: RouteHandler) { this.routes.set(`PATCH ${path}`, handler); }
+    use() { /* no middleware is mounted by the registrar under test */ }
+    async listen() { /* never listens: handlers are driven in-process */ }
+}
+
+/** `POST /share-links` through the plugin door, with `envelope` as the resolved caller. */
+async function mintOnPluginDoor(
+    engine: any,
+    svc: ShareLinkService,
+    envelope: ExecutionContext,
+): Promise<{ status: number; body: any }> {
+    const http = new RouteRecorder();
+    registerShareLinkRoutes(http, svc, engine, { contextFromRequest: () => envelope });
+    const handler = http.routes.get('POST /api/v1/share-links');
+    if (!handler) throw new Error('registerShareLinkRoutes mounted no POST /api/v1/share-links');
+    const captured: { status: number; body: any } = { status: 200, body: undefined };
+    const res: IHttpResponse = {
+        json: (data: any) => { captured.body = data; },
+        send: () => { /* the share-link routes answer JSON only */ },
+        status: (code: number) => { captured.status = code; return res; },
+        header: () => res,
+    };
+    const req: IHttpRequest = {
+        params: {},
+        query: {},
+        body: { object: OBJECT, recordId: RECORD },
+        headers: {},
+        method: 'POST',
+        path: '/api/v1/share-links',
+    };
+    await handler(req, res);
+    return captured;
+}
+
+describe('[#21405] the plugin route door answers the same refusal with the same status', () => {
+    for (const posture of ['single', 'group'] as const) {
+        it(`${posture} posture: no allowRead on the object answers 403 PERMISSION_DENIED through BOTH doors`, async () => {
+            const caller = noReadCaller(posture);
+            const tables: Record<string, any[]> = {
+                [OBJECT]: caller.records,
+                sys_share_link: [],
+                sys_permission_set: [],
+            };
+            const engine = makeEngine(tables);
+            await bootSecurity(engine, posture, caller.permissionSets, caller.fallbackPermissionSet);
+            const svc = new ShareLinkService({ engine: engine as any });
+
+            const plugin = await mintOnPluginDoor(engine, svc, caller.envelope);
+            const dispatched = await handleShareLinksRequest(
+                makeDeps(engine, svc),
+                '',
+                'POST',
+                { object: OBJECT, recordId: RECORD },
+                {},
+                httpContext(caller.envelope),
+            );
+            const dispatcher = dispatched.response as { status: number; body: any };
+
+            expect(plugin.status, `plugin door: ${JSON.stringify(plugin.body)}`).toBe(403);
+            expect(plugin.body).toMatchObject({ success: false, error: { code: 'PERMISSION_DENIED' } });
+            expect(dispatcher.status, `dispatcher door: ${JSON.stringify(dispatcher.body)}`).toBe(403);
+            expect(expectDeclaredEnvelope(dispatcher).code).toBe('PERMISSION_DENIED');
+            // Neither refused mint wrote a link.
+            expect(tables.sys_share_link).toEqual([]);
+        }, 30_000);
+    }
+});