CVE-2026-73631: Unsynchronized Access to Shared Data in a Multithreaded Context

August 15, 2026 (updated August 18, 2026)

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.

References

cwiki.apache.org/confluence/display/WW/S2-070
nvd.nist.gov/vuln/detail/CVE-2026-73631

Code Behaviors & Features

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