Exploit for Authentication Bypass by Spoofing in Alibaba Nacos

Proof-of-concept exploit for CVE-2021-29441. CVSS 9.8.

Published 8 Oct 2026Updated 8 Oct 202683 sources
CVSS 9.8 ✓ VERIFIED REFERENCE

What happened

Alibaba Nacos authentication bypass via User-Agent: Nacos-Server allows listing and creating users.

Affected versions

Unknown product: See original advisory Fixed: See vendor advisory.

Why it matters

This source correlation may provide earlier visibility while structured CVE metadata is still being updated.

Detection & mitigation

  • Review the original advisory and validate affected versions.
  • Apply vendor-provided updates or mitigations when available.

Public PoC references