{"record":{"id":"5472b86bb1b67f24","repo":"mastra-ai/mastra","slug":"access-denied-unable-to-verify-message-thread-acc","errorCode":null,"errorMessage":"Access denied: unable to verify message thread access","messagePattern":"Access denied: unable to verify message thread access","errorType":"http","errorClass":"HTTPException","httpStatus":403,"severity":"error","filePath":"packages/server/src/server/handlers/memory.ts","lineNumber":169,"sourceCode":"\nasync function enforceDeleteMessagesThreadAccess({\n  mastra,\n  requestContext,\n  memoryStore,\n  messageIds,\n  effectiveResourceId,\n}: {\n  mastra: any;\n  requestContext?: RequestContext;\n  memoryStore: MemoryStorage;\n  messageIds: string[];\n  effectiveResourceId?: string;\n}): Promise<void> {\n  const { messages } = await memoryStore.listMessagesById({ messageIds });\n  const threadIds = [...new Set(messages.map(m => m.threadId).filter(Boolean))] as string[];\n\n  if (messages.some(message => !message.threadId)) {\n    throw new HTTPException(403, { message: 'Access denied: unable to verify message thread access' });\n  }\n\n  for (const threadId of threadIds) {\n    const thread = await memoryStore.getThreadById({ threadId });\n    if (!thread) {\n      throw new HTTPException(403, { message: 'Access denied: unable to verify message thread access' });\n    }\n\n    await enforceThreadAccess({\n      mastra,\n      requestContext,\n      threadId,\n      thread,\n      effectiveResourceId,\n      permission: MastraFGAPermissions.MEMORY_DELETE,\n    });\n  }\n}","sourceCodeStart":151,"sourceCodeEnd":187,"githubUrl":"https://github.com/mastra-ai/mastra/blob/75dd419e613fe9c39f846ffc500716141b74fda6/packages/server/src/server/handlers/memory.ts#L151-L187","documentation":"Thrown by `enforceDeleteMessagesThreadAccess` when at least one of the requested message ids either does not exist or exists but has no `threadId`, so thread-level access cannot be verified. The library refuses to delete messages whose owning thread it cannot determine, treating it as access-denied (403) rather than deleting blindly.","triggerScenarios":"DELETE /api/memory/messages (DELETE_MESSAGES_ROUTE) with a body of `messageIds` where one or more ids are stale/already deleted, belong to another tenant, or were stored without a threadId (e.g. detached/unthreaded messages).","commonSituations":"See trigger scenarios.","solutions":["Re-fetch the thread's current messages and delete only ids that still exist in the list.","Filter out messages with no `threadId` before sending the delete request, and handle detached messages via a separate flow.","Verify you are using the same resourceId/storage scope the messages were created under.","Make the delete idempotent client-side: tolerate 403 for already-deleted ids and retry only the remaining ids."],"exampleFix":"// before\nawait api.deleteMessages({ messageIds: allIds })\n// after\nconst current = await api.getMessages(threadId);\nconst deletable = allIds.filter(id => current.messages.some(m => m.id === id && m.threadId));\nawait api.deleteMessages({ messageIds: deletable });","handlingStrategy":"validation","validationCode":"const { messages } = await api.listThreadMessages(threadId);\nconst deletable = requestedIds.filter(id => messages.some(m => m.id === id && m.threadId));\nif (deletable.length !== requestedIds.length) {\n  console.warn('Skipping ids not found or without thread:', requestedIds.filter(id => !deletable.includes(id)));\n}","typeGuard":"function isDeletable(m: { id: string; threadId?: string | null }): m is { id: string; threadId: string } {\n  return typeof m.threadId === 'string' && m.threadId.length > 0;\n}","tryCatchPattern":"try {\n  await api.deleteMessages({ messageIds });\n} catch (e) {\n  if (isHttpError(e, 403) && e.message.includes('thread access')) {\n    // refetch current messages and retry with only valid ids\n  }\n  throw e;\n}","preventionTips":["Always scope message ids from a fresh fetch of the thread before deleting.","Treat delete as idempotent and handle 403 on already-deleted ids.","Never delete ids captured in long-lived client state without revalidation."],"tags":["memory","authorization","http-403"],"backgroundTag":"thread-access-denied","analyzedSha":"75dd419e613fe9c39f846ffc500716141b74fda6","analyzedAt":"2026-08-30T00:15:31.844Z","schemaVersion":2},"datasetVersion":"2026-08-30T03:17:51.788Z"}