CVE-2026-55759
Rocket.Chat: Apple Sign-In skips JWT claims validation, allowing expired and cross-audience token replay
Description
Rocket.Chat is an open-source, secure, fully customizable communications platform. Prior to 8.5.1, 8.4.4, 8.3.6, 8.2.6, 8.1.6, 8.0.7, and 7.10.13, Rocket.Chat's Apple Sign-In handler verifies JWT signatures but skips claims validation. Any Apple-signed JWT with a non-empty iss is accepted regardless of aud, exp, nbf, or nonce. An attacker who obtains a target user's Apple identity token (from server logs, an intercepted sign-in flow, or another application sharing the same Apple developer team) can replay it to authenticate as that user, with no expiration on the replay window. This vulnerability is fixed in 8.5.1, 8.4.4, 8.3.6, 8.2.6, 8.1.6, 8.0.7, and 7.10.13.
INFO
Published Date :
June 24, 2026, 9:07 p.m.
Last Modified :
June 24, 2026, 9:07 p.m.
Remotely Exploit :
Yes !
Source :
GitHub_M
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | MITRE-CVE |
Solution
- Update Rocket.Chat to version 8.5.1 or later.
- Apply patches for versions 8.4.4, 8.3.6, 8.2.6, 8.1.6, 8.0.7, or 7.10.13.
- Verify JWT claims validation is correctly implemented.
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CVE-2026-55759 vulnerability anywhere in the article.