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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.

PUBLISHED Reserved 2026-04-08 | Published 2026-06-19 | Updated 2026-06-22 | Assigner apache




MEDIUM: 5.8CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H

Problem types

CWE-20 Improper Input Validation

Product status

Default status
unaffected

2.12.0 (semver)
affected

Credits

Fernando Mecozzi reporter

References

www.openwall.com/lists/oss-security/2026/06/19/4

lists.apache.org/thread/vgkvy396010d7g6m0jrn4d3hjf2svlvv vendor-advisory

cve.org (CVE-2026-39998)

nvd.nist.gov (CVE-2026-39998)

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