RocketChat Rocket.Chat up to 8.5.0 improper authentication

Summaryinfo

A vulnerability, which was classified as critical, was found in RocketChat Rocket.Chat up to 8.5.0. This affects an unknown part. Executing a manipulation can lead to improper authentication. This vulnerability is handled as CVE-2026-55759. The attack can be executed remotely. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in RocketChat Rocket.Chat up to 8.5.0. It has been declared as critical. This vulnerability affects some unknown functionality. The manipulation with an unknown input leads to a improper authentication vulnerability. The CWE definition for the vulnerability is CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability was named CVE-2026-55759 since 06/17/2026. The exploitation appears to be difficult. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available.

Upgrading to version 7.10.13, 8.0.7, 8.1.6, 8.2.6, 8.3.6, 8.4.4 or 8.5.1 eliminates this vulnerability.

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Productinfo

Type

• Chat Software

Vendor

• RocketChat

Name

• Rocket.Chat

Version

• 7.10.0
• 7.10.1
• 7.10.2
• 7.10.3
• 7.10.4
• 7.10.5
• 7.10.6
• 7.10.7
• 7.10.8
• 7.10.9
• 7.10.10
• 7.10.11
• 7.10.12
• 8.0
• 8.0.0
• 8.0.1
• 8.0.2
• 8.0.3
• 8.0.4
• 8.0.5
• 8.0.6
• 8.1
• 8.1.0
• 8.1.1
• 8.1.2
• 8.1.3
• 8.1.4
• 8.1.5
• 8.2
• 8.2.0
• 8.2.1
• 8.2.2
• 8.2.3
• 8.2.4
• 8.2.5
• 8.3
• 8.3.0
• 8.3.1
• 8.3.2
• 8.3.3
• 8.3.4
• 8.3.5
• 8.4
• 8.4.0
• 8.4.1
• 8.4.2
• 8.4.3
• 8.5.0

License

• free

Website

• Product: https://github.com/RocketChat/Rocket.Chat/

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