CVE-2026-49872 Apache Software Foundation CVE debrief

Who should care

Defenders responsible for Apache APISIX instances, particularly those using the cas-auth plugin, should be aware of this vulnerability. They should assess their exposure and take steps to limit potential damage. This includes reviewing current configurations, monitoring for suspicious activity, and preparing for an upgrade to version 3.17.0.

Technical summary

The CVE-2026-49872 vulnerability is caused by improper authentication in the cas-auth plugin of Apache APISIX. This allows an attacker to potentially authenticate using credentials from a different source when the plugin is used in a route. The affected versions of Apache APISIX range from 3.0.0 to 3.16.0. The vulnerability has a CVSS score of 5.3, indicating medium severity. The CWE associated with this vulnerability is CWE-287, Improper Authentication.

Defensive priority

Medium priority due to CVSS score of 5.3 and potential for authentication bypass.

Recommended defensive actions

• Inventory Apache APISIX instances and identify those using the cas-auth plugin.
• Review current configurations and monitor for suspicious activity.
• Prepare for an upgrade to Apache APISIX version 3.17.0.
• Verify if compensating controls are in place to mitigate potential damage.
• Track exceptions and anomalies in authentication attempts.

Evidence notes

The primary evidence for this vulnerability comes from the CVE record and the NVD detail page. The CVE record provides an overview of the vulnerability, including its description, affected versions, and recommended actions. The NVD detail page offers additional information, such as the CVSS score and vector. The vulnerability affects Apache APISIX versions from 3.0.0 through 3.16.0. Defenders should verify this information from official sources, such as the Apache APISIX documentation and security advisories.

Official resources