CVE-2026-73631: apache software foundation apache struts

Vulnerability summary

CVE-2026-73631 is a medium (CVSS 4.3) vulnerability in apache software foundation apache struts. EPSS estimates a 0.38% chance of exploitation in the next 30 days, higher than 29.9% of scored vulnerabilities.

Timeline

1. 15-08-2026
   PublishedVulnerability first disclosed.
2. 17-08-2026
   Last modifiedVulnerability information updated.

Description

Exposure of data element to wrong session vulnerability in the JSON plugin of Apache Struts. Per-request parsing state could be shared across concurrent requests, allowing data associated with one request to become observable in another, and configured parsing limits not to be enforced as intended. Populating actions from a JSON request body is not enabled by default; applications that do not use the JSON plugin are not affected. This issue affects Apache Struts: 7.2.1. Users are recommended to upgrade to version 7.3.0, which fixes the issue.

• CWE-567Unsynchronized Access to Shared Data in a Multithreaded ContextThe product does not properly synchronize shared data, such as static variables across threads, which can lead to undefined behavior and unpredictable data changes.