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.

No CVSS v4.0

No CVSS v3.1

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00209.

Exploitation none

Automatable yes

Technical Impact total

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Rocket.Chat Rocket.Chat unaffected
Version Status Constraints
0 affected < 8.7.0
0 affected < 8.6.1
0 affected < 8.5.2
0 affected < 8.4.5
0 affected < 8.3.7
0 affected < 8.2.7
0 affected < 8.1.7
0 affected < 8.0.8
0 affected < 7.10.14

No data.

No data.

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Vendors Products
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Project Subscriptions

Vendors Products
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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/RocketChat/Rocket.Chat/pull/41233 cve-icon
https://hackerone.com/reports/3827674 cve-icon
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'}

Projects

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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

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-02T05:45:03Z

Weaknesses