ZIA, ZPA and connectors
CVE-2025-54982: SAML 2.0 Public Key Validation Issue
An improper verification of cryptographic signature in Zscaler's SAML authentication mechanism on the server-side allowed an authentication abuse.
Published
ExploitedNot in CISA KEV
Ransomware useNot reportedPer CISA
SeverityCRITICALCVSS 3.1 9.6
EPSS0.40%Chance of exploitation in 30 days
Public exploitNot tracked
FixAvailable
Automatic summary from the vendor's CVE record. We haven't written a full analysis of this vulnerability yet.
Affected and fixed versions
| Product / branch | Fixed in |
|---|---|
| Authentication Server 0 | 6.2r or later |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
An improper verification of cryptographic signature in Zscaler's SAML authentication mechanism on the server-side allowed an authentication abuse.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 13 Oct 2026.