CVE-2026-39998CWE-20

Apache APISIX: Identity Injection via forward-auth Plugin Missing Header Cleanup

Medium · published June 19, 2026

CVSS v4.0
5.8
EPSS
1%
Percentile
51.7
In the wild
Unconfirmed
What it is

Improper Input Validation vulnerability in Apache APISIX.

The attacker can take advantage of certain configuration in forward-auth plugin to spoof identity headers.

This issue affects Apache APISIX: from 2.12.0 through 3.16.0.

Users are recommended to upgrade to version 3.17.0, which fixes the issue.

The record
Technical detail
CVSS v4.0
5.8 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H
EPSS
0.00676 · 51.7th percentile
Weakness
CWE-20 · Improper Input Validation
Published
2026-06-19T13:04Z
EPSS history
Timeline
  • 19 JUN 13:04Z
    Apache APISIX: Identity Injection via forward-auth Plugin Missing Header Cleanup
    cvelistv5