CVE-2026-58066

9.8 criticalEPSS 0.4%

Critical (9.8) in rocket.chat rocket.chat. 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.

Severity

CVSS 3.0

9.8 critical

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.4% chance of exploitation in the next 30 days; higher than 32% of CVEs (scores of 2026-10-31)
CWE: CWE-287
Published: 2026-07-30
Modified: 2026-08-25
Record from: the NVD, synced 2026-10-19

Affected

rocket.chat:rocket.chat

References

https://github.com/RocketChat/Rocket.Chat/pull/41233
https://hackerone.com/reports/3827674

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