{
  "id": 18292155,
  "title": "Why JWT Signature Verification Alone Can't Prevent Token Replay",
  "url": "https://urgent.news/2026/11/05/why-jwt-signature-verification-alone-cant-prevent-token-replay",
  "topic": "tech",
  "section": "Tech",
  "published": "2026-11-05T07:05:57.000Z",
  "source": {
    "name": "HackerNoon",
    "slug": "hackernoon",
    "url": "https://hackernoon.com/why-jwt-signature-verification-alone-cant-prevent-token-replay?source=rss"
  },
  "original_language": "en",
  "account": "Verifying the signature of an access token alone is insufficient to prevent unauthorized access to APIs when multiple APIs trust the same identity provider. While a correctly signed and valid token may pass signature verification, authentication logs may not reveal any issues, leading to a successful authentication despite the token being intended for a different resource server. The audience claim (aud) within the token's payload specifies the intended recipient, which should be checked by the resource server to ensure the token is valid for the requested API. If the audience check is omitted, a token issued for one service can be accepted as valid for another, resulting in a token replay vulnerability. This scenario, while hypothetical, highlights a configuration gap in relying solely on signature verification for API authorization and emphasizes the importance of enforcing proper token audience validation to maintain security boundaries between APIs.",
  "summary": "A valid JWT isn't always authorized. Discover how missing audience checks expose APIs to token replay and how to prevent it.",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}