CVE-2026-58066: Rocket.chat

Critical severity, CVSS 9.8. EPSS: 0.4% chance of exploitation in the next 30 days.

Rocket.Chat's SAML SSO before versions 8.7.0, 8.6.1, 8.5.2, 8.4.5, 8.3.7, 8.2.7, 8.1.7, 8.0.8, and 7.10.14 verified XML signatures but did not bind the validated signature to samlp:Response / saml:Assertion. An attacker could submit a wrapped document carrying forged identity attributes alongside any valid signature made by the trusted IdP certificate, and log in as an arbitrary user.

Affected products

• Rocket.chat Rocket.chat: before 7.10.14 (fixed in 7.10.14); from 8.0.0, before 8.0.8 (fixed in 8.0.8); from 8.1.0, before 8.1.7 (fixed in 8.1.7); from 8.2.0, before 8.2.7 (fixed in 8.2.7); from 8.3.0, before 8.3.7 (fixed in 8.3.7); from 8.4.0, before 8.4.5 (fixed in 8.4.5); …

Published 2026-07-30. Last modified 2026-08-25.