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Vulnerability record · CVE-2026-58066 · published 30 July 2026

CVE-2026-58066: Rocket.chat improper authentication vulnerability

RRocket.Chat · Rocket.Chat

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.

9.8 CVSS 3.0 Critical EPSS 0.38% · top 70.4% CWE-287 · Improper authentication
9.8CVSS 3.0 base score
0.38%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
25 Aug 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/RocketChat/Rocket.Chat/pull/41233 Issue Tracking
https://hackerone.com/reports/3827674 Third Party AdvisoryIssue Tracking

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Source: NIST National Vulnerability Database (record CVE-2026-58066), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.