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CVE-2026-45677 – Unauthenticated SAML Logout Spoofing Leading to Platform-Wide DoS – Rocket.Chat …

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Summary

CVE-2026-45677 is a high-severity missing authorization vulnerability in Rocket.Chat’s SAML integration that allows an unauthenticated remote attacker to forcibly terminate any SAML-authenticated user’s session by submitting an unsigned LogoutRequest to the service provider logout endpoint. Rated CVSS 4.0: 8.7 (HIGH), the flaw can be automated at scale to render an entire Rocket.Chat deployment unusable for all SAML-authenticated users, constituting a platform-wide availability attack.

Technical details

  • Root cause: Rocket.Chat’s SAML implementation does not verify the cryptographic signature on inbound LogoutRequest messages (CWE-862: Missing Authorization). The server accepts and processes unsigned logout requests as legitimate, immediately destroying the targeted session.
  • Trigger conditions: The vulnerability is exploitable on any Rocket.Chat instance where SAML-based single sign-on has been enabled and configured. The attacker must know a target user’s SAML NameID — which major identity providers (Okta, Google Workspace, Microsoft Entra ID, JumpCloud) expose as the user’s email address.
  • Attack vector: Network-based, fully unauthenticated, no user interaction required. An attacker crafts an unsigned LogoutRequest containing the victim’s NameID and submits it directly to the SAML SP logout endpoint over HTTP/HTTPS.
  • Impact: Immediate and silent session destruction for the targeted user. Because the attack requires no authentication and can be scripted against a list of known email addresses, it can be executed in a loop across all SAML-authenticated accounts, effectively locking every user out of the platform and rendering it operationally unavailable. There is no confidentiality or integrity impact.

Affected software

  • Rocket.Chat all versions prior to 7.10.11
  • Rocket.Chat 7.11.x through versions prior to 7.13.7
  • Rocket.Chat 8.0.x through versions prior to 8.0.5
  • Rocket.Chat 8.1.x through versions prior to 8.1.4
  • Rocket.Chat 8.2.x through versions prior to 8.2.3
  • Rocket.Chat 8.3.x through versions prior to 8.3.3
  • Rocket.Chat 8.4.x through versions prior to 8.4.1
  • Rocket.Chat 8.5.x release candidates prior to 8.5.0

Severity

CVSS 4.0 Base Score: 8.7 (HIGH)
Vector: 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

The score reflects a network-based, zero-complexity, unauthenticated attack with high availability impact and no confidentiality or integrity compromise.

Mitigation and recommended actions

  • Immediate action — patch: Upgrade to one of the fixed releases that corresponds to your current branch:
    • 8.5.0 (latest stable)
    • 8.4.1, 8.3.3, 8.2.3, 8.1.4, 8.0.5 (patch releases for active branches)
    • 7.13.7, 7.10.11 (patch releases for older supported branches)
  • If immediate patching is not feasible: No vendor-documented workarounds have been published. Organizations that cannot patch immediately should assess the operational risk and consider restricting network access to the SAML logout endpoint at the perimeter, or temporarily disabling SAML SSO until the upgrade can be applied.

IONIX Status

The IONIX research team is tracking ongoing exploitation attempts and recommends immediate patching. Potentially affected assets are outlined in this post.

References

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