What is CVE-2026-39999?

CVE-2026-39999 is a critical-severity vulnerability in Apache Apisix, classified under Authentication Bypass by Spoofing. CVSS score: 9.1/10. Published 2026-06-19.

How severe is CVE-2026-39999?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Vulnerability in Apache Apisix

CVE-2026-39999

Authentication Bypass by Spoofing vulnerability in Apache APISIX. The attacker can completely bypass authentication capitalising on certain configurations of jwt-auth plugin. This issue affects Apache APISIX: from v2.2 through v3.16.0. U…

EPSS: 0.004 (34.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

Affected products

Apache Apisix
Apache Software Foundation Apisix — versions 2.2

Weakness classification (CWE)

CWE-290 — Authentication Bypass by Spoofing

References

security@apache.org (vendor-advisory, Mailing List, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Third Party Advisory)

Frequently asked questions

What is CVE-2026-39999?: CVE-2026-39999 is a critical-severity vulnerability in Apache Apisix, classified under Authentication Bypass by Spoofing. CVSS score: 9.1/10. Published 2026-06-19.
How severe is CVE-2026-39999?: Critical severity. CVSS v3 base score is 9.1 out of 10.