CVE-2026-58066
Received
Received - Intake
SAML Signature Bypass in Rocket.Chat
Vulnerability report for CVE-2026-58066, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-07-30
Last updated on: 2026-07-30
Assigner: HackerOne
Description
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 Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| rocket_chat | saml_sso | to 8.7.0 (exc) |
| rocket.chat | rocket.chat | to 8.7.0 (exc) |
| rocket.chat | rocket.chat | 8.7.0 |
| rocket.chat | rocket.chat | 8.6.1 |
| rocket.chat | rocket.chat | 8.5.2 |
| rocket.chat | rocket.chat | 8.4.5 |
| rocket.chat | rocket.chat | 8.3.7 |
| rocket.chat | rocket.chat | 8.2.7 |
| rocket.chat | rocket.chat | 8.1.7 |
| rocket.chat | rocket.chat | 8.0.8 |
| rocket.chat | rocket.chat | 7.10.14 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-287 | When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. |
