Missing Authentication for Critical Function in Rocket.Chat - CVE-2026-45677
Published: May 14, 2026
Vulnerability identifier: #VU131418
CSH Severity: Medium
CVSS v4.0: 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/E:U/U:Green
CVE-ID: CVE-2026-45677
CWE-ID: CWE-306
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Rocket.Chat Technologies Corp.
Affected software:
Rocket.Chat
Rocket.Chat
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper authentication in SAML logout request processing when handling inbound LogoutRequest messages at the SP logout endpoint. A remote attacker can submit a valid-looking unsigned LogoutRequest for a target user to cause a denial of service.
Exploitation requires knowledge of the target user's SAML NameID.
How to mitigate CVE-2026-45677
Install security update from vendor's website.