Improper SAML signature verification
Priority MEDIUM 43CWE-347Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-347.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00391 33rd percentileScored 2026-11-07
Fix Fixed ZIA Admin Portal (Zscaler): 6.2 (current)
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
- Fix · CNA ZIA Admin Portal (Zscaler) Fixed in 6.2 (current)
Timeline
- 2026-10-02 Threatist record created from CVE-2023-28801
- 2026-10-03 Alias added: GHSA-wfp5-6m78-crh3
References
More Zscaler Internet Access Admin Portal vulnerabilities
- TI-2026-18135 ZIA Admin UI Input Validation Bug CVSS 3.1HIGH 7.6
- TI-2026-18136 Unauthorized information retrieval in ZIA Admin UI CVSS 3.1MEDIUM 5.5
Sources
- CVE-2023-28801 · CVE Program
- CVE-2023-28801 · NVD
- FIRST EPSS
- GHSA-wfp5-6m78-crh3 · GitHub Advisory Database · CC BY 4.0
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