RocketChat Rocket.Chat up to 8.4.x SP Logout Endpoint authorization

Summaryinfo

A vulnerability classified as problematic has been found in RocketChat Rocket.Chat up to 8.4.x. The affected element is an unknown function of the component SP Logout Endpoint. Performing a manipulation results in authorization. This vulnerability was named CVE-2026-45677. The attack may be initiated remotely. There is no available exploit. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in RocketChat Rocket.Chat up to 8.4.x. It has been classified as problematic. This affects some unknown processing of the component SP Logout Endpoint. The manipulation with an unknown input leads to a authorization vulnerability. CWE is classifying the issue as CWE-862. The product does not perform an authorization check when an actor attempts to access a resource or perform an action. This is going to have an impact on availability. The summary by CVE is:

Rocket.Chat is an open-source, secure, fully customizable communications platform. Prior to 8.5.0, 8.4.1, 8.3.3, 8.2.3, 8.1.4, 8.0.5, 7.13.7, and 7.10.11, Rocket.Chat's SAML integration does not verify the signature on inbound LogoutRequest messages. An unauthenticated remote attacker who knows a target user's SAML NameID - which major identity providers (Okta, Google Workspace, Microsoft Entra ID, JumpCloud) expose as the user's email address - can craft a valid-looking unsigned LogoutRequest and submit it to the SP logout endpoint. The server processes it as legitimate, immediately destroying the victim's session. Because the attack requires no authentication and no interaction from the victim, it can be repeated in a loop against individual users or scripted across many accounts, effectively rendering the Rocket.Chat instance unusable for SAML-authenticated users. This vulnerability is fixed in 8.5.0, 8.4.1, 8.3.3, 8.2.3, 8.1.4, 8.0.5, 7.13.7, and 7.10.11.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-45677 since 05/12/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available.

Upgrading to version 7.10.11, 7.13.7, 8.0.5, 8.1.4, 8.2.3, 8.3.3, 8.4.1 or 8.5.0 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
• 7.13.0
• 7.13.1
• 7.13.2
• 7.13.3
• 7.13.4
• 7.13.5
• 7.13.6
• 8.0
• 8.0.0
• 8.0.1
• 8.0.2
• 8.0.3
• 8.0.4
• 8.1
• 8.1.0
• 8.1.1
• 8.1.2
• 8.1.3
• 8.2
• 8.2.0
• 8.2.1
• 8.2.2
• 8.3
• 8.3.0
• 8.3.1
• 8.3.2
• 8.4
• 8.4.0

License

• free

Website

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

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