CVE-2026-45677: CWE-862: Missing Authorization in RocketChat Rocket.Chat
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.
AI Analysis
Technical Summary
CVE-2026-45677 is a missing authorization vulnerability (CWE-862) in Rocket.Chat's SAML integration prior to versions 7.10.11, 7.13.7, 8.0.5, 8.1.4, 8.2.3, 8.3.3, 8.4.1, and 8.5.0. The platform does not verify the signature on inbound LogoutRequest messages, allowing unauthenticated remote attackers who know a target user's SAML NameID to craft unsigned LogoutRequest messages. These messages are accepted and processed by the server, causing immediate session termination of the targeted user. This vulnerability enables denial of service against SAML-authenticated users by repeatedly logging them out without their consent or interaction. The vulnerability has a CVSS 4.0 score of 8.7 (high severity).
Potential Impact
An unauthenticated attacker can forcibly terminate sessions of SAML-authenticated users by submitting unsigned LogoutRequest messages that the server accepts as legitimate. This can be done repeatedly or at scale, effectively denying service to affected users by preventing them from maintaining active sessions. There is no indication of data disclosure or privilege escalation, but the disruption impacts availability for SAML users.
Mitigation Recommendations
This vulnerability is fixed in Rocket.Chat versions 7.10.11, 7.13.7, 8.0.5, 8.1.4, 8.2.3, 8.3.3, 8.4.1, and 8.5.0. Users should upgrade to one of these versions or later to remediate the issue. No other mitigation or workaround is indicated. Patch status is confirmed by the vendor advisory.
CVE-2026-45677: CWE-862: Missing Authorization in RocketChat Rocket.Chat
Description
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.
CVSS v4.0
Score 8.7high
Affected software
pkg:github/rocketchat/Rocket.ChatRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-45677 is a missing authorization vulnerability (CWE-862) in Rocket.Chat's SAML integration prior to versions 7.10.11, 7.13.7, 8.0.5, 8.1.4, 8.2.3, 8.3.3, 8.4.1, and 8.5.0. The platform does not verify the signature on inbound LogoutRequest messages, allowing unauthenticated remote attackers who know a target user's SAML NameID to craft unsigned LogoutRequest messages. These messages are accepted and processed by the server, causing immediate session termination of the targeted user. This vulnerability enables denial of service against SAML-authenticated users by repeatedly logging them out without their consent or interaction. The vulnerability has a CVSS 4.0 score of 8.7 (high severity).
Potential Impact
An unauthenticated attacker can forcibly terminate sessions of SAML-authenticated users by submitting unsigned LogoutRequest messages that the server accepts as legitimate. This can be done repeatedly or at scale, effectively denying service to affected users by preventing them from maintaining active sessions. There is no indication of data disclosure or privilege escalation, but the disruption impacts availability for SAML users.
Mitigation Recommendations
This vulnerability is fixed in Rocket.Chat versions 7.10.11, 7.13.7, 8.0.5, 8.1.4, 8.2.3, 8.3.3, 8.4.1, and 8.5.0. Users should upgrade to one of these versions or later to remediate the issue. No other mitigation or workaround is indicated. Patch status is confirmed by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-12T21:59:25.666Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a3c4ce14853345fc1df8ce9
Added to database: 06/24/2026, 21:32:17 UTC
Last enriched: 07/01/2026, 22:44:04 UTC
Last updated: 08/05/2026, 00:41:14 UTC
Views: 67
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