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CVE-2026-16520

• Severity: high (CVSS 8.7 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-21 · updated 2026-10-26
• Weakness: CWE-20

Description

Improper input validation and Exposure of sensitive information through data queries vulnerability in Genians Genian NAC V4.0, Genians Genian NAC V5.0, and Genians Genian ZTNA V6.0 allows SQL Injection and Authentication Bypass. This issue affects Genian NAC V4.0: from 4.0.0 before 4.0.175(Revision 150340); Genian NAC V5.0: from 5.0.0 before 5.0.65 LTS(Revision 150331), from 5.0.0 before 5.0.75 LTS(Revision 150330), from 5.0.0 before 5.0.87 Release Stable(Revision 150329), and from 5.0.0 before 5.0.88(Revision 150328); Genian ZTNA V6.0: from 6.0.0 before 6.0.26 LTS(Revision 150337), from 6.0.0 before 6.0.35 LTS(Revision 150336), from 6.0.0 before 6.0.47 Release Stable(Revision 150334), and from 6.0.0 before 6.0.48(Revision 150333).

Affected products

• Genians Genian NAC V4.0: from 4.0.0 before 4.0.175(Revision 150340) — fixed in 4.0.175(Revision 150340)
• Genians Genian NAC V5.0: from 5.0.0 before 5.0.65 LTS(Revision 150331); from 5.0.0 before 5.0.75 LTS(Revision 150330); from 5.0.0 before 5.0.87 Release Stable(Revision 150329); from 5.0.0 before 5.0.88(Revision 150328) — fixed in 5.0.65 LTS(Revision 150331), 5.0.75 LTS(Revision 150330), 5.0.87 Release Stable(Revision 150329), 5.0.88(Revision 150328)
• Genians Genian ZTNA V6.0: from 6.0.0 before 6.0.26 LTS(Revision 150337); from 6.0.0 before 6.0.35 LTS(Revision 150336); from 6.0.0 before 6.0.47 Release Stable(Revision 150334); from 6.0.0 before 6.0.48(Revision 150333) — fixed in 6.0.26 LTS(Revision 150337), 6.0.35 LTS(Revision 150336), 6.0.47 Release Stable(Revision 150334), 6.0.48(Revision 150333)

How to fix

Upgrade to a fixed version: Genians Genian NAC V4.0 4.0.175(Revision 150340); Genians Genian NAC V5.0 5.0.65 LTS(Revision 150331), 5.0.75 LTS(Revision 150330), 5.0.87 Release Stable(Revision 150329), 5.0.88(Revision 150328); Genians Genian ZTNA V6.0 6.0.26 LTS(Revision 150337), 6.0.35 LTS(Revision 150336), 6.0.47 Release Stable(Revision 150334), 6.0.48(Revision 150333). Check the vendor advisory for mitigations.

References

• https://docs.genians.com/release/ko/advisories/GN-SA-2026-003.html
• https://github.com/genians/security-research/security/advisories/GHSA-f6f5-wx2h-ccfw

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