Vulnerability · Published Jun 24, 2026 · Assigned by GitHub_M
CVE-2026-55759Rocket.Chat: Apple Sign-In skips JWT claims validation, allowing expired and cross-audience token replay
High 7.4
In plain English
A high-severity improper authentication in Rocket.Chat from RocketChat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 25% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| RocketChat | Rocket.Chat | >= 8.5.0-rc.0, < 8.5.1>= 8.4.0-rc.0, < 8.4.4>= 8.3.0-rc.0, < 8.3.6>= 8.2.0-rc.0, < 8.2.6>= 8.1.0-rc.0, < 8.1.6>= 7.11.0-rc.0, < 8.0.7< 7.10.13 |
Weakness: CWE-287, CWE-294 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N