What’s Vulnerable › Vulnerabilities

CVE-2026-58066

• Severity: critical (CVSS 9.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-30 · updated 2026-08-25
• Weakness: CWE-287

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.

Affected products

• Rocket.Chat: before 7.10.14; from 8.0.0 before 8.0.8; from 8.1.0 before 8.1.7; from 8.2.0 before 8.2.7; from 8.3.0 before 8.3.7; from 8.4.0 before 8.4.5 — fixed in 7.10.14, 8.0.8, 8.1.7, 8.2.7, 8.3.7, 8.4.5

How to fix

Upgrade to a fixed version: Rocket.Chat 7.10.14, 8.0.8, 8.1.7, 8.2.7. Check the vendor advisory for mitigations.

References

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

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