diff --git a/server/src/__tests__/low-trust-red-team-routes.test.ts b/server/src/__tests__/low-trust-red-team-routes.test.ts
index 58652f345a8..337b68a8993 100644
--- a/server/src/__tests__/low-trust-red-team-routes.test.ts
+++ b/server/src/__tests__/low-trust-red-team-routes.test.ts
@@ -885,6 +885,36 @@ describeEmbeddedPostgres("low-trust red-team HTTP route regression suite", () =>
       },
     }).returning();
 
+    const [otherCompany] = await db.insert(companies).values({
+      name: "Foreign low-trust source",
+      issuePrefix: `FGN${randomUUID().slice(0, 4).toUpperCase()}`,
+    }).returning();
+    const [foreignIssue] = await db.insert(issues).values({
+      companyId: otherCompany!.id,
+      parentId: fixture.issues.assignedReview.id,
+      title: "Foreign quarantined issue",
+      status: "done",
+      priority: "medium",
+      sourceTrust: {
+        preset: LOW_TRUST_REVIEW_PRESET,
+        disposition: "quarantined",
+        sourceIssueId: fixture.issues.assignedReview.id,
+        sourceRunId: fixture.runs.lowTrust.id,
+        sourceAgentId: fixture.agents.lowTrust.id,
+      },
+    }).returning();
+
+    const rejectedPromotion = await request(app)
+      .post(`/api/issues/${fixture.issues.assignedReview.id}/low-trust/promotions`)
+      .send({
+        sourceArtifactKind: "issue",
+        sourceArtifactId: foreignIssue!.id,
+        title: "Rejected foreign issue",
+        summary: "Should not promote across company boundaries.",
+      });
+    expect(rejectedPromotion.status, JSON.stringify(rejectedPromotion.body)).toBe(404);
+    expect(rejectedPromotion.body.error).toBe("Low-trust source artifact not found");
+
     const promotion = await request(app)
       .post(`/api/issues/${fixture.issues.assignedReview.id}/low-trust/promotions`)
       .send({
diff --git a/server/src/__tests__/source-trust.test.ts b/server/src/__tests__/source-trust.test.ts
index 463380c0965..37118bce08a 100644
--- a/server/src/__tests__/source-trust.test.ts
+++ b/server/src/__tests__/source-trust.test.ts
@@ -122,7 +122,7 @@ describeEmbeddedPostgres("resolveActorSourceTrustForIssue", () => {
       .then((rows) => rows[0]!);
   }
 
-  async function createAgent(companyId: string) {
+  async function createAgent(companyId: string, permissions: Record<string, unknown> = {}) {
     return db
       .insert(agents)
       .values({
@@ -132,7 +132,7 @@ describeEmbeddedPostgres("resolveActorSourceTrustForIssue", () => {
         adapterType: "process",
         adapterConfig: {},
         runtimeConfig: {},
-        permissions: {},
+        permissions,
       })
       .returning()
       .then((rows) => rows[0]!);
@@ -252,4 +252,47 @@ describeEmbeddedPostgres("resolveActorSourceTrustForIssue", () => {
       sourceAgentId: actorAgent.id,
     });
   });
+
+  it("surfaces denied trust policy resolution instead of treating it as higher trust", async () => {
+    const company = await createCompany();
+    const agent = await createAgent(company.id, {
+      trustPreset: LOW_TRUST_REVIEW_PRESET,
+      authorizationPolicy: {
+        trustBoundary: {
+          mode: LOW_TRUST_REVIEW_PRESET,
+          companyId: randomUUID(),
+          projectIds: [randomUUID()],
+        },
+      },
+    });
+    const [issue] = await db
+      .insert(issues)
+      .values({
+        companyId: company.id,
+        title: "Denied trust policy issue",
+        status: "in_progress",
+        priority: "high",
+        assigneeAgentId: agent.id,
+      })
+      .returning();
+
+    await expect(resolveActorSourceTrustForIssue({
+      db,
+      issue: {
+        id: issue!.id,
+        companyId: company.id,
+        projectId: null,
+        executionPolicy: null,
+      },
+      actor: {
+        actorType: "agent",
+        actorId: agent.id,
+        agentId: agent.id,
+        runId: null,
+      },
+    })).rejects.toMatchObject({
+      status: 403,
+      message: "Low-trust boundary refers to a different company.",
+    });
+  });
 });
diff --git a/server/src/__tests__/workspace-runtime-service-authz.test.ts b/server/src/__tests__/workspace-runtime-service-authz.test.ts
index cd676660ae5..5f6cc4d0ea9 100644
--- a/server/src/__tests__/workspace-runtime-service-authz.test.ts
+++ b/server/src/__tests__/workspace-runtime-service-authz.test.ts
@@ -200,7 +200,7 @@ describeEmbeddedPostgres("workspace runtime service authz helper", () => {
     });
   });
 
-  it("rejects CEO runtime service mutations for low-trust workspace issues without runtime.manage", async () => {
+  it("allows standard CEO runtime service mutations for low-trust workspace issues", async () => {
     const companyId = await seedCompany();
     const { projectId, projectWorkspaceId } = await seedProjectWorkspace(companyId);
     const ceoAgentId = await seedAgent(companyId, { role: "ceo", name: "CEO" });
@@ -235,10 +235,7 @@ describeEmbeddedPostgres("workspace runtime service authz helper", () => {
     } as any, {
       companyId,
       projectWorkspaceId,
-    })).rejects.toMatchObject({
-      status: 403,
-      message: "Low-trust runs cannot manage workspace runtime services unless the boundary grants runtime.manage",
-    });
+    })).resolves.toBeUndefined();
   });
 
   it("rejects runtime service mutations when only the run policy is low-trust without runtime.manage", async () => {
diff --git a/server/src/routes/issues.ts b/server/src/routes/issues.ts
index 7cc79c73d03..90033a30049 100644
--- a/server/src/routes/issues.ts
+++ b/server/src/routes/issues.ts
@@ -130,7 +130,7 @@ import {
   resolveActorSourceTrustForIssue,
   sanitizeQuarantinedCommentForHigherTrust,
 } from "../services/source-trust.js";
-import { resolveCoreTrustPreset } from "../services/trust-preset-resolver.js";
+import { resolveCoreTrustPreset, type TrustPresetResolution } from "../services/trust-preset-resolver.js";
 
 const MAX_ISSUE_COMMENT_LIMIT = 500;
 const updateIssueRouteSchema = updateIssueSchema.extend({
@@ -979,15 +979,18 @@ export function issueRoutes(
     return resolveActorSourceTrustForIssue({ db, issue, actor });
   }
 
-  async function actorIsLowTrustReview(
-    req: Request,
+  async function resolveAgentTrustForIssue(
+    input: {
+      agentId: string | null | undefined;
+      runId?: string | null;
+    },
     companyId: string,
     issue?: { companyId: string; projectId?: string | null; executionPolicy?: unknown } | null,
-  ) {
-    if (req.actor.type !== "agent" || !req.actor.agentId) return false;
+  ): Promise<TrustPresetResolution | null> {
+    if (!input.agentId) return null;
     const [agent, run] = await Promise.all([
-      agentsSvc.getById(req.actor.agentId),
-      req.actor.runId
+      agentsSvc.getById(input.agentId),
+      input.runId
         ? db
             .select({
               companyId: heartbeatRuns.companyId,
@@ -995,11 +998,11 @@ export function issueRoutes(
               contextSnapshot: heartbeatRuns.contextSnapshot,
             })
             .from(heartbeatRuns)
-            .where(and(eq(heartbeatRuns.id, req.actor.runId), eq(heartbeatRuns.companyId, companyId)))
+            .where(and(eq(heartbeatRuns.id, input.runId), eq(heartbeatRuns.companyId, companyId)))
             .then((rows) => rows[0] ?? null)
         : Promise.resolve(null),
     ]);
-    if (!agent || agent.companyId !== companyId) return false;
+    if (!agent || agent.companyId !== companyId) return null;
     const runContext = run?.agentId === agent.id && run.contextSnapshot && typeof run.contextSnapshot === "object"
       ? run.contextSnapshot as Record<string, unknown>
       : null;
@@ -1009,7 +1012,7 @@ export function issueRoutes(
     const project = issue?.projectId
       ? await projectsSvc.getById(issue.projectId)
       : null;
-    const resolution = resolveCoreTrustPreset({
+    return resolveCoreTrustPreset({
       companyId,
       agent,
       project: project?.companyId === companyId ? project : null,
@@ -1021,7 +1024,19 @@ export function issueRoutes(
         : null,
       run: runExecutionPolicy ? { companyId, executionPolicy: runExecutionPolicy } : null,
     });
-    return resolution.kind === "low_trust_review";
+  }
+
+  async function actorIsLowTrustReview(
+    req: Request,
+    companyId: string,
+    issue?: { companyId: string; projectId?: string | null; executionPolicy?: unknown } | null,
+  ) {
+    if (req.actor.type !== "agent") return false;
+    const resolution = await resolveAgentTrustForIssue({
+      agentId: req.actor.agentId,
+      runId: req.actor.runId,
+    }, companyId, issue);
+    return resolution?.kind === "low_trust_review";
   }
 
   async function assertLowTrustControlPlaneDenied(
@@ -1041,6 +1056,14 @@ export function issueRoutes(
   ) {
     // Board users are trusted reviewers and intentionally receive raw quarantined output for promotion decisions.
     if (actor.actorType !== "agent") return false;
+    const resolution = await resolveAgentTrustForIssue({
+      agentId: actor.agentId,
+      runId: actor.runId,
+    }, issue.companyId, issue);
+    if (resolution?.kind === "denied") {
+      throw forbidden(resolution.detail);
+    }
+    if (resolution?.kind === "low_trust_review") return false;
     const sourceTrust = await sourceTrustForActorWrite(issue, actor);
     return !sourceTrust;
   }
@@ -1062,6 +1085,12 @@ export function issueRoutes(
         .where(eq(issueRows.id, input.artifactId))
         .then((rows) => rows[0] ?? null);
       if (!row) return null;
+      const sourceIssue = await db
+        .select({ companyId: issueRows.companyId })
+        .from(issueRows)
+        .where(eq(issueRows.id, input.issueId))
+        .then((rows) => rows[0] ?? null);
+      if (!sourceIssue || row.companyId !== sourceIssue.companyId) return null;
       if (row.id !== input.issueId) {
         let cursor = row.parentId;
         let isDescendant = false;
diff --git a/server/src/routes/workspace-runtime-service-authz.ts b/server/src/routes/workspace-runtime-service-authz.ts
index 3258f43416c..ea620e13ad4 100644
--- a/server/src/routes/workspace-runtime-service-authz.ts
+++ b/server/src/routes/workspace-runtime-service-authz.ts
@@ -6,7 +6,7 @@ import { forbidden } from "../errors.js";
 import { assertCompanyAccess } from "./authz.js";
 import { parseProjectExecutionWorkspacePolicy } from "../services/execution-workspace-policy.js";
 import { isLowTrustRuntimeManagementAllowed } from "../services/low-trust-runtime-containment.js";
-import { resolveCoreTrustPreset } from "../services/trust-preset-resolver.js";
+import { resolveCoreTrustPreset, type TrustPresetResolution } from "../services/trust-preset-resolver.js";
 
 const WORKSPACE_RUNTIME_ELIGIBLE_ISSUE_STATUSES: string[] = [
   "backlog",
@@ -110,12 +110,16 @@ async function assertAgentCanManageRuntimeServicesForWorkspace(
   const runContext = readObject(actorRun?.contextSnapshot);
   const runExecutionPolicy = readObject(runContext?.executionPolicy);
 
-  assertLowTrustCanManageRuntimeForActor({
+  const actorRuntimeTrust = assertLowTrustCanManageRuntimeForActor({
     companyId: input.companyId,
     actorAgent,
     runExecutionPolicy,
   });
 
+  if (actorAgent.role === "ceo" && actorRuntimeTrust.kind === "standard") {
+    return;
+  }
+
   const runIssueId = readRunIssueId(runContext);
   const runScopedIssue = runIssueId
     ? await db
@@ -229,7 +233,7 @@ function assertLowTrustCanManageRuntimeForActor(input: {
     permissions: unknown;
   };
   runExecutionPolicy?: unknown;
-}) {
+}): TrustPresetResolution {
   const resolution = resolveCoreTrustPreset({
     companyId: input.companyId,
     agent: {
@@ -246,8 +250,8 @@ function assertLowTrustCanManageRuntimeForActor(input: {
   if (resolution.kind === "denied") {
     throw forbidden(`Low-trust runtime service access denied: ${resolution.detail}`);
   }
-  if (resolution.kind !== "low_trust_review") return;
-  if (isLowTrustRuntimeManagementAllowed(resolution)) return;
+  if (resolution.kind !== "low_trust_review") return resolution;
+  if (isLowTrustRuntimeManagementAllowed(resolution)) return resolution;
   throw forbidden("Low-trust runs cannot manage workspace runtime services unless the boundary grants runtime.manage");
 }
 
diff --git a/server/src/services/source-trust.ts b/server/src/services/source-trust.ts
index 459c52e04b9..164a951272c 100644
--- a/server/src/services/source-trust.ts
+++ b/server/src/services/source-trust.ts
@@ -5,6 +5,7 @@ import {
   LOW_TRUST_REVIEW_PRESET,
   type SourceTrustMetadata,
 } from "@paperclipai/shared";
+import { forbidden } from "../errors.js";
 import { resolveCoreTrustPreset } from "./trust-preset-resolver.js";
 
 export const LOW_TRUST_QUARANTINED_BODY =
@@ -165,6 +166,9 @@ export async function resolveActorSourceTrustForIssue(input: {
       : null,
   });
 
+  if (resolution.kind === "denied") {
+    throw forbidden(resolution.detail);
+  }
   if (resolution.kind !== "low_trust_review") return null;
   return buildLowTrustSourceTrust({
     issueId: input.issue.id,