What is CVE-2026-49871?

CVE-2026-49871 is a critical-severity vulnerability in Apache Apisix, classified under Cross-Site Request Forgery (CSRF). CVSS score: 9.3/10. Published 2026-06-19.

How severe is CVE-2026-49871?

Critical severity. CVSS v3 base score is 9.3 out of 10.

CSRF in Apache Apisix

CVE-2026-49871

Cross-Site Request Forgery (CSRF) vulnerability in the cas-auth plugin under default configurations. This defect allows a remote attacker that manages to send a victim to a webpage controlled by them can cause the victim's browser to become authenticated as a different identity. Actions the victim takes upstream are then attributed to attackers identity. 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: CSRF (Cross-Site Request Forgery)

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

CVSS v3 metric

CVSS v3 base score 9.3 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.004 (26.2th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 26.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Apache Apisix
Apache Software Foundation Apisix — versions 3.0.0

Weakness classification (CWE)

CWE-352 — Cross-Site Request Forgery (CSRF)

References

lists.apache.org/thread/1ozsnss0lof4gpwq763d66oxwxt3sycp (vendor-advisory, Mailing List, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Third Party Advisory)

Frequently asked questions

What is CVE-2026-49871?: CVE-2026-49871 is a critical-severity vulnerability in Apache Apisix, classified under Cross-Site Request Forgery (CSRF). CVSS score: 9.3/10. Published 2026-06-19.
How severe is CVE-2026-49871?: Critical severity. CVSS v3 base score is 9.3 out of 10.