What is CVE-2026-49872?

CVE-2026-49872 is a high-severity vulnerability in Apache Apisix, classified under Improper Authentication. CVSS score: 8.1/10. Published 2026-06-19.

How severe is CVE-2026-49872?

High severity. CVSS v3 base score is 8.1 out of 10.

Auth bypass in Apache Apisix

CVE-2026-49872

Improper Authentication vulnerability in Apache APISIX. When the cas-auth plugin is used in a route, an attacker can possibly authenticate itself with credentials from a different source. This issue affects Apache APISIX: from 3.0.0 through 3.16.0. Users are recommended to upgrade to version 3.17.0, which fixes the issue.

Vulnerability class: Broken Authentication

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

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.005 (42.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 42nd percentile — 42.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Apache Apisix
Apache Software Foundation Apisix — versions 3.0.0

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

lists.apache.org/thread/bzjpo60ygxo7kxdqf7vw3l5zw2lh6m5k (vendor-advisory, Mailing List, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Third Party Advisory)

Frequently asked questions

What is CVE-2026-49872?: CVE-2026-49872 is a high-severity vulnerability in Apache Apisix, classified under Improper Authentication. CVSS score: 8.1/10. Published 2026-06-19.
How severe is CVE-2026-49872?: High severity. CVSS v3 base score is 8.1 out of 10.