CVE-2026-45677
HighCVSS 8.7Exploitation Probability (EPSS)
Low risk36th percentile — higher than 36% of all known CVEs
Summary
Rocket.Chat prior to version 8.5.0 does not verify the signature on LogoutRequest messages in SAML integration. An unauthorized attacker can craft a fake logout request, leading to the immediate termination of the victim's session.
Risk Assessment
An attacker can repeatedly log out users utilizing SAML authentication, resulting in loss of access to the Rocket.Chat platform for those users. This may cause disruptions in communication within the organization.
Recommendation
It is recommended to upgrade to versions 8.5.0, 8.4.1, 8.3.3, 8.2.3, 8.1.4, 8.0.5, 7.13.7, or 7.10.11 to mitigate this vulnerability.
Original NVD description (English source)
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.