Apache Struts 7.2.1 JSON Plugin Session Data Leak (CVE-2026-73631)
CVE-2026-73631 Published on August 15, 2026
Apache Struts: Shared parsing state in the JSON plugin
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.
Weakness Type
Unsynchronized Access to Shared Data in a Multithreaded Context
The product does not properly synchronize shared data, such as static variables across threads, which can lead to undefined behavior and unpredictable data changes.
Products Associated with CVE-2026-73631
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