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9.6

Zscaler SAML Authentication Allows Unauthorized Access

CVE-2025-54982 · published 1 year ago
Summary

A security flaw in Zscaler's SAML authentication process may allow attackers to access accounts without proper authorization. This vulnerability affects organizations using Zscaler for SAML-based authentication. To protect, ensure you have the latest Zscaler updates installed and follow recommended security best practices for SAML configuration.

Original advisory text
An improper verification of cryptographic signature in Zscaler's SAML authentication mechanism on the server-side allowed an authentication abuse.
An improper verification of cryptographic signature in Zscaler's SAML authentication mechanism on the server-side allowed an authentication abuse.
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker full control
Severity
9.6 Critical
Exploitation
<1% chance of attack within 30 days
Type
CWE-347Improper Verification of Cryptographic Signature
Timeline
Published5 Aug 2025
Updated4 Nov 2026
First seen7 Mar 2026
Sources
CVE-2025-54982 · NVD
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