CVE-2026-45677 (GCVE-0-2026-45677)

Vulnerability from cvelistv5 – Published: 2026-06-24 20:54 – Updated: 2026-06-25 13:41
VLAI
Title
Rocket.Chat: Lack of SAML Signature Check During Logout Could Lead To DoS
Summary
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.
Severity
8.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-25 13:40 UTC
CWE
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7868 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
RocketChat Rocket.Chat Affected: >= 8.5.0-rc.0, < 8.5.0
Affected: >= 8.4.0-rc.0, < 8.4.1
Affected: >= 8.3.0-rc.0, < 8.3.3
Affected: >= 8.2.0-rc.0, < 8.2.3
Affected: >= 8.1.0-rc.0, < 8.1.4
Affected: >= 8.0.0-rc.0, < 8.0.5
Affected: >= 7.11.0-rc.0, < 7.13.7
Affected: < 7.10.11
guessed Create a notification for this product.
Show details on NVD website
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