CVE-2026-49871 Apache Software Foundation CVE debrief

Who should care

Defenders managing Apache APISIX instances, especially those using the cas-auth plugin, should prioritize patching to prevent potential impersonation attacks. Security teams responsible for web application security and identity management should review the affected versions and upgrade to 3.17.0. This vulnerability is particularly concerning for environments where user impersonation could lead to unauthorized access or actions.

Technical summary

The CVE-2026-49871 vulnerability is a Cross-Site Request Forgery (CSRF) issue in the cas-auth plugin of Apache APISIX. It allows an attacker to forge requests that appear to come from a legitimate user, potentially leading to unauthorized actions. The vulnerability is rated with a CVSS score of 2.1, indicating low severity. It affects Apache APISIX versions from 3.0.0 to 3.16.0. The recommended mitigation is to upgrade to version 3.17.0, which fixes the CSRF vulnerability. The attack vector is network-based, and the attack complexity is low.

Defensive priority

Low severity, but high priority for patching due to potential for user impersonation

Recommended defensive actions

• Upgrade Apache APISIX to version 3.17.0 or later
• Review and adjust configurations of the cas-auth plugin
• Monitor for suspicious activity that could indicate exploitation attempts
• Implement additional CSRF protections if upgrading is not immediately feasible
• Inventory APISIX instances to ensure all affected versions are patched

Evidence notes

The primary evidence for this vulnerability comes from the CVE record and the NVD detail page. The vulnerability affects Apache APISIX versions from 3.0.0 through 3.16.0. Defenders should verify their APISIX versions and configurations to determine exposure. The CVSS score of 2.1 indicates low severity, but the potential for user impersonation requires prompt attention.

Official resources