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.
Published: 2026-07-30
Score: 9.8 Critical
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Remediation

No vendor fix or workaround currently provided.

Additional remediation guidance may be available on OpenCVE Cloud.

Tracking

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Advisories

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History

Sun, 02 Aug 2026 06:00:00 +0000

Type Values Removed Values Added
Title SAML SSO Authentication Bypass via Unbound XML Signature in Rocket.Chat

Fri, 31 Jul 2026 05:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Thu, 30 Jul 2026 09:30:00 +0000

Type Values Removed Values Added
First Time appeared Rocket.chat
Rocket.chat rocket.chat
Vendors & Products Rocket.chat
Rocket.chat rocket.chat

Thu, 30 Jul 2026 06:15:00 +0000

Type Values Removed Values Added
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.
Weaknesses CWE-287
References
Metrics cvssV3_0

{'score': 9.8, 'vector': 'CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

Subscriptions

Rocket.chat Rocket.chat
cve-icon MITRE

Status: PUBLISHED

Assigner: hackerone

Published:

Updated: 2026-07-31T03:55:47.931Z

Reserved: 2026-06-28T15:00:00.719Z

Link: CVE-2026-58066

cve-icon Vulnrichment

Updated: 2026-07-30T12:54:11.684Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-07-30T06:25:55.540

Modified: 2026-07-31T04:17:23.877

Link: CVE-2026-58066

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-03T11:15:04Z

Weaknesses