Vulnerability · Published Aug 5, 2025 · Assigned by Zscaler
CVE-2025-54982SAML 2.0 Public Key Validation Issue
Critical 9.6
In plain English
A critical-severity security flaw in Authentication Server from Zscaler. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 36% of all known vulnerabilities).
Severity (CVSS 3.1)9.6Critical
Exploit odds (30 days)0.4%top 64.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
An improper verification of cryptographic signature in Zscaler's SAML authentication mechanism on the server-side allowed an authentication abuse.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Zscaler | Authentication Server | 0 – before 6.2r |
Weakness: CWE-347 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N