What’s Vulnerable › Vulnerabilities
CVE-2026-55759: Rocket.Chat: Apple Sign-In skips JWT claims validation, allowing expired and cross-audience token replay
- Severity: high (CVSS 7.4 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-06-24 · updated 2026-10-25
- Weakness: CWE-287
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
- Rocket.Chat: from 8.5.0-rc.0, < 8.5.1; from 8.4.0-rc.0, < 8.4.4; from 8.3.0-rc.0, < 8.3.6; from 8.2.0-rc.0, < 8.2.6; from 8.1.0-rc.0, < 8.1.6; from 7.11.0-rc.0, < 8.0.7
References
Get alerted when CVE-2026-55759 or the next vulnerability affects your stack