Is CVE-2026-58066 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-58066?

CVE-2026-58066 has a CVSS v3 severity of CRITICAL (9.8).

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CVE-2026-58066

Description

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.