Description
An improper verification of cryptographic signature in Zscaler's SAML authentication mechanism on the server-side allowed an authentication abuse.
Published: 2025-08-05
Score: 9.6 Critical
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
EUVD EUVD EUVD-2025-23602 An improper verification of cryptographic signature in Zscaler's SAML authentication mechanism on the server-side allowed an authentication abuse.
History

Tue, 05 Aug 2025 21:30:00 +0000

Type Values Removed Values Added
First Time appeared Zscaler
Zscaler authentication Server
Vendors & Products Zscaler
Zscaler authentication Server

Tue, 05 Aug 2025 16:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Tue, 05 Aug 2025 05:45:00 +0000

Type Values Removed Values Added
Description An improper verification of cryptographic signature in Zscaler's SAML authentication mechanism on the server-side allowed an authentication abuse.
Title SAML 2.0 Public Key Validation Issue
Weaknesses CWE-347
References
Metrics cvssV3_1

{'score': 9.6, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N'}


Subscriptions

Zscaler Authentication Server
cve-icon MITRE

Status: PUBLISHED

Assigner: Zscaler

Published:

Updated: 2026-02-26T17:49:58.538Z

Reserved: 2025-08-04T14:51:53.367Z

Link: CVE-2025-54982

cve-icon Vulnrichment

Updated: 2025-08-05T15:59:06.512Z

cve-icon NVD

Status : Deferred

Published: 2025-08-05T06:15:26.437

Modified: 2026-04-15T00:35:42.020

Link: CVE-2025-54982

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2025-08-05T21:23:03Z

Weaknesses