CVE-2023-28801: Improper SAML signature verification

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-08-31 · updated 2026-06-17
Weakness: CWE-347

Description

An Improper Verification of Cryptographic Signature in the SAML authentication of the Zscaler Admin UI allows a Privilege Escalation.This issue affects Admin UI: from 6.2 before 6.2r.

Affected products

Zscaler ZIA Admin UI: from 6.2 before 6.2r — fixed in 6.2r

How to fix

Upgrade to a fixed version: Zscaler ZIA Admin UI 6.2r. Check the vendor advisory for mitigations.

References

https://help.zscaler.com/zia/release-upgrade-summary-2023
https://help.zscaler.com/zia/release-upgrade-summary-2023

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