CVE-2026-55759 Details
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.
A vulnerability in Rocket.Chat's Apple Sign-In handler prior to versions 8.5.1, 8.4.4, 8.3.6, 8.2.6, 8.1.6, 8.0.7, and 7.10.13 allows for the replay of Apple-signed JWTs. While the handler verifies JWT signatures, it fails to validate key claims such as audience, expiration, not before, and nonce. This oversight enables an attacker to authenticate as a user by replaying an intercepted Apple identity token, without any limitation on the replay window.
Users can upgrade to Rocket.Chat versions 8.5.1, 8.4.4, 8.3.6, 8.2.6, 8.1.6, 8.0.7, or 7.10.13 to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Jun 24, 2026CISA-ADP
Assessed Jun 25, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/RocketChat/Rocket.Chat/security/advisories/GHSA-c75c-5hc7-j4vp | [email protected] | AdvisoryTechnical AnalysisVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-287 | Improper Authentication | [email protected] |
| CWE-294 | Authentication Bypass by Capture-replay | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Rocket.Chat | < 8.5.1 (semver) < 8.4.4 (semver) < 8.3.6 (semver) < 8.2.6 (semver) < 8.1.6 (semver) < 8.0.7 (semver) < 7.10.13 (semver) |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 26, 2026 | CVE Modified | CISA-ADP |
| Jun 26, 2026 | CVE Modified | CISA-ADP |
| Jun 24, 2026 | New CVE Received | [email protected] |