CVE-2026-39998

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

Published Jun 19, 2026 CVSS 4.0 · 5.8 Medium EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Apache
Apache apache Apisix
Vendors & Products Apache
Apache apache Apisix
Type Values Removed Values Added
Description 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.
Title Apache APISIX: Identity Injection via forward-auth Plugin Missing Header Cleanup
Weaknesses CWE-20
References
Metrics cvssV4_0

{'score': 5.8, '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
apache
Published
Updated
Jun 22, 2026, 4:16 PM
Reserved
Apr 8, 2026, 2:34 AM
Status
Analyzed
Published
Jun 19, 2026, 2:16 PM
Modified
Oct 26, 2026, 11:10 AM