CVE-2026-73631 Apache Struts: Shared parsing state in the JSON plugin

What is CVE-2026-73631?

CVE-2026-73631 is a medium-severity vulnerability in Apache Struts, published on 15 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official 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.

Weakness: CWE-567

Which versions are affected by CVE-2026-73631?

It affects 1 product.

Products include Apache Struts.

How do I fix CVE-2026-73631?

No fix has been published for CVE-2026-73631 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-73631 being exploited?

There is no known exploitation of CVE-2026-73631 in the wild and no public exploit code.

Other vulnerabilities in Apache Struts

• CVE-2020-17530 Apache Struts Remote Code Execution Exploited Critical 9.8
• CVE-2017-9791 Apache Struts 1 Improper Input Validation Exploited Critical 9.8
• CVE-2017-5638 Apache Struts Remote Code Execution Exploited Critical 9.8
• CVE-2012-0391 Apache Struts 2 Improper Input Validation Exploited Critical 9.8
• CVE-2018-11776 Apache Struts Remote Code Execution Exploited High 8.1

All Apache Struts vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-gvf6-rf7m-9h3g.