[ANN] CVE-2026-73631: Apache Struts: Shared parsing state in the JSON plugin - S2-070

Severity: moderate

Affected versions:
- Apache Struts (org.apache.struts:struts2-json-plugin) 7.2.1

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.

Credit:
g0w6y (https://github.com/g0w6y) (finder)

References:
https://cwiki.apache.org/confluence/display/WW/S2-070
https://www.cve.org/CVERecord?id=CVE-2026-73631


On behalf of the Apache Struts project
Łukasz Lenart