What is CVE-2026-49231?

CVE-2026-49231 is a medium-severity vulnerability in Apache Apisix, classified under Authentication Bypass by Spoofing. CVSS score: 5.4/10. Published 2026-06-19.

How severe is CVE-2026-49231?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Vulnerability in Apache Apisix

CVE-2026-49231

Authentication Bypass by Spoofing vulnerability in opa plugin. An attacker could relay spoofed identity headers to upstream capitalising on non-default configuration in opa plugin. This could allow the attacker to assume higher privileges on the upstream service. This issue affects Apache APISIX: from 3.5.0 through 3.16.0. Users are recommended to upgrade to version 3.17.0, which fixes the issue.

Published 2026-06-19 · last modified 2026-06-23.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.006 (45.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 45.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Apache Apisix
Apache Software Foundation Apisix — versions 3.5.0

Weakness classification (CWE)

CWE-290 — Authentication Bypass by Spoofing

References

lists.apache.org/thread/s1jd1vxm59p6ghx47xhmpjdk1cobo4hn (vendor-advisory, Mailing List, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Third Party Advisory)

Frequently asked questions

What is CVE-2026-49231?: CVE-2026-49231 is a medium-severity vulnerability in Apache Apisix, classified under Authentication Bypass by Spoofing. CVSS score: 5.4/10. Published 2026-06-19.
How severe is CVE-2026-49231?: Medium severity. CVSS v3 base score is 5.4 out of 10.