diff --git a/apps/server/src/integrations/routes.ts b/apps/server/src/integrations/routes.ts
index 95a3d53..b6f0758 100644
--- a/apps/server/src/integrations/routes.ts
+++ b/apps/server/src/integrations/routes.ts
@@ -786,16 +786,17 @@ export async function registerIntegrationRoutes(app: FastifyInstance): Promise<v
     const limit = clampSearchLimit(request.body.limit, 10);
 
     if (externalAccountId) {
-      // Per-user search — fan-out across all workspaces the linked user belongs to
+      // Per-user search, scoped to the integration's own workspace.
+      //
+      // GHSA-fwgr-c6wh-xxff: this used to fan out across every workspace the linked user
+      // belonged to. document-read looks only in integration.workspaceId and 404s anything
+      // else, so search surfaced path/title/snippet for documents read would deny — an
+      // integration authorized for one workspace could enumerate the user's other ones.
+      // Search must never return what read would refuse, so the two now share this scope.
       const externalProvider = (request.body.externalProvider ?? integration.providerKey).trim();
       const link = await resolveLink(integration, externalProvider, externalAccountId, reply);
       if (!link) return;
 
-      const memberships = await prisma.workspaceMembership.findMany({
-        where: { userId: link.userId },
-        select: { workspaceId: true },
-      });
-      const workspaceIds = memberships.map((m) => m.workspaceId);
       await prisma.externalAccountLink.update({ where: { id: link.id }, data: { lastUsedAt: new Date() } });
 
       // A per-user search is an agent tool call; mirror the MCP path.
@@ -806,40 +807,16 @@ export async function registerIntegrationRoutes(app: FastifyInstance): Promise<v
         { tool_name: "document_search", token_id: null, token_kind: "integration", change_source: "agent", surface: "integration_rest", external_provider: externalProvider },
       );
 
-      if (workspaceIds.length === 1) {
-        const results = await searchDocuments({
-          userId: link.userId,
-          workspaceId: workspaceIds[0]!,
-          query,
-          limit,
-          canonicalOnly: request.body.canonicalOnly ?? false,
-        });
-        return { results: results.map((r) => ({ ...r, workspaceId: workspaceIds[0]! })) };
-      }
-
-      const workspaceNames = await prisma.workspace.findMany({
-        where: { id: { in: workspaceIds } },
-        select: { id: true, name: true },
+      // searchDocuments applies the linked user's own permissions within the workspace, so a
+      // document they cannot read is filtered out before any snippet is built.
+      const results = await searchDocuments({
+        userId: link.userId,
+        workspaceId: integration.workspaceId,
+        query,
+        limit,
+        canonicalOnly: request.body.canonicalOnly ?? false,
       });
-      const nameById = new Map(workspaceNames.map((w) => [w.id, w.name]));
-
-      const settled = await Promise.allSettled(
-        workspaceIds.map((wsId) =>
-          searchDocuments({ userId: link.userId, workspaceId: wsId, query, limit, canonicalOnly: request.body.canonicalOnly ?? false }),
-        ),
-      );
-      const resultGroups: Array<{ workspaceId: string; workspaceName: string; results: SearchDocumentsResult[] }> = [];
-      const errors: { workspaceId: string; reason: string }[] = [];
-      for (let i = 0; i < settled.length; i++) {
-        const outcome = settled[i]!;
-        const wsId = workspaceIds[i]!;
-        if (outcome.status === "fulfilled") {
-          resultGroups.push({ workspaceId: wsId, workspaceName: nameById.get(wsId) ?? wsId, results: outcome.value });
-        } else {
-          errors.push({ workspaceId: wsId, reason: outcome.reason instanceof Error ? outcome.reason.message : String(outcome.reason) });
-        }
-      }
-      return { results: mergeWorkspaceSearchResults(resultGroups, limit), errors };
+      return { results: results.map((r) => ({ ...r, workspaceId: integration.workspaceId })) };
     }
 
     // Workspace-level search: canonical only, restricted to allowedFolders
diff --git a/apps/server/test/integration/integrations-linking.test.ts b/apps/server/test/integration/integrations-linking.test.ts
index 63d8b1d..9d13088 100644
--- a/apps/server/test/integration/integrations-linking.test.ts
+++ b/apps/server/test/integration/integrations-linking.test.ts
@@ -430,10 +430,13 @@ describe("REST-mode document action endpoints", () => {
     expect(res.json().results[0]).toHaveProperty("workspaceId");
   });
 
-  it("document-search: 200 fans out across all user workspaces when user is a member of multiple", async () => {
+  // GHSA-fwgr-c6wh-xxff. This endpoint used to fan out across every workspace the linked
+  // user belonged to, while document-read only ever looks in the integration's workspace.
+  // Search must never surface a document read would refuse — not even its path or snippet.
+  it("document-search: stays inside the integration's workspace, matching document-read", async () => {
     const { s, auth } = await setupActions();
 
-    // Add the same user to a second workspace with its own document
+    // The linked user is also an admin of a second workspace the integration knows nothing about.
     const ws2 = await createWorkspace("Second Workspace", `ws2-${randomUUID().slice(0, 8)}`);
     await addMember(ws2.id, s.admin.id, "admin");
     const f2 = await req({
@@ -450,7 +453,18 @@ describe("REST-mode document action endpoints", () => {
       payload: { workspaceId: ws2.id, folderId: f2.json().id, title: "Runbook 2", slug: "runbook-2", content: "# Runbook 2\n" },
     });
     expect(d2.statusCode).toBe(201);
+    const outOfScopeDocId = d2.json().id as string;
 
+    // document-read refuses the out-of-scope document...
+    const read = await req({
+      method: "POST",
+      url: "/api/integrations/actions/document-read",
+      headers: auth,
+      payload: { externalProvider: "hermes", externalAccountId: "hermes-admin-1", documentId: outOfScopeDocId },
+    });
+    expect(read.statusCode).toBe(404);
+
+    // ...so search must not leak its existence either.
     const res = await req({
       method: "POST",
       url: "/api/integrations/actions/document-search",
@@ -458,12 +472,65 @@ describe("REST-mode document action endpoints", () => {
       payload: { externalProvider: "hermes", externalAccountId: "hermes-admin-1", query: "Runbook" },
     });
     expect(res.statusCode).toBe(200);
-    const { results, errors } = res.json() as { results: Array<{ workspaceId: string }>; errors?: unknown[] };
+    const { results } = res.json() as { results: Array<{ id: string; workspaceId: string }> };
     expect(results).toBeInstanceOf(Array);
-    expect(errors ?? []).toHaveLength(0);
-    const wsIds = new Set(results.map((r) => r.workspaceId));
-    expect(wsIds.has(s.ws.id)).toBe(true);
-    expect(wsIds.has(ws2.id)).toBe(true);
+    // In-scope documents still come back — this is a scope fix, not a shutdown.
+    expect(results.length).toBeGreaterThan(0);
+    expect(new Set(results.map((r) => r.workspaceId))).toEqual(new Set([s.ws.id]));
+    expect(results.some((r) => r.id === outOfScopeDocId)).toBe(false);
+  });
+
+  it("document-search: never returns a document the linked user cannot read", async () => {
+    const { s, auth } = await setupActions();
+
+    // A plain member with no grants on a private folder: document-read denies them.
+    const member = await createUser(`member-${randomUUID()}@t.co`, "Member");
+    await addMember(s.ws.id, member.id, "member");
+    const link = await req({
+      method: "POST",
+      url: "/api/integrations/connect-sessions",
+      headers: auth,
+      payload: { externalProvider: "hermes", externalAccountId: "hermes-member-1" },
+    });
+    expect(link.statusCode).toBe(201);
+    const { sessionId, connectUrl } = link.json() as { sessionId: string; connectUrl: string };
+    await confirm(sessionId, tokenFromConnectUrl(connectUrl), member.id);
+
+    const rf = await req({
+      method: "POST",
+      url: "/api/folders",
+      cookies: s.adminCookie,
+      payload: { workspaceId: s.ws.id, name: "Restricted", slug: "restricted" },
+    });
+    expect(rf.statusCode).toBe(201);
+    const rd = await req({
+      method: "POST",
+      url: "/api/documents",
+      cookies: s.adminCookie,
+      payload: { workspaceId: s.ws.id, folderId: rf.json().id, title: "Layoffs", slug: "layoffs", content: "# Layoffs\nzebrafish plan\n" },
+    });
+    expect(rd.statusCode).toBe(201);
+    const restrictedDocId = rd.json().id as string;
+
+    const read = await req({
+      method: "POST",
+      url: "/api/integrations/actions/document-read",
+      headers: auth,
+      payload: { externalProvider: "hermes", externalAccountId: "hermes-member-1", documentId: restrictedDocId },
+    });
+    expect(read.statusCode).toBe(403);
+
+    const res = await req({
+      method: "POST",
+      url: "/api/integrations/actions/document-search",
+      headers: auth,
+      payload: { externalProvider: "hermes", externalAccountId: "hermes-member-1", query: "zebrafish" },
+    });
+    expect(res.statusCode).toBe(200);
+    const { results } = res.json() as { results: Array<{ id: string; snippet: string | null }> };
+    expect(results.some((r) => r.id === restrictedDocId)).toBe(false);
+    // Not even a snippet: the body must never be excerpted for a denied document.
+    expect(results.some((r) => (r.snippet ?? "").includes("zebrafish"))).toBe(false);
   });
 
   it("document-search: 400 when query is missing", async () => {