CVE-2026-73631: CWE-567 Unsynchronized Access to Shared Data in a Multithreaded Context in Apache Software Foundation Apache Struts
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.
AI Analysis
Technical Summary
This vulnerability arises from unsynchronized access to per-request parsing state in the JSON plugin of Apache Struts 7.2.1. The shared parsing state across concurrent requests can lead to exposure of data elements from one session to another and prevent configured parsing limits from being enforced properly. The flaw only affects applications that enable populating actions from a JSON request body, which is not enabled by default. The issue is resolved by upgrading to Apache Struts 7.3.0.
Potential Impact
An attacker could observe data associated with other concurrent requests due to shared parsing state, leading to partial data exposure (confidentiality impact). There is no impact on integrity or availability. The vulnerability requires network access with low privileges and no user interaction. The overall impact is limited to information disclosure.
Mitigation Recommendations
Users should upgrade Apache Struts from version 7.2.1 to 7.3.0, where this vulnerability is fixed. Since the vulnerability only affects applications using the JSON plugin with populating actions from JSON request bodies enabled, disabling this feature if not needed can also mitigate exposure. No other official remediation level or patch links are provided, so checking the vendor advisory for updates is recommended.
CVE-2026-73631: CWE-567 Unsynchronized Access to Shared Data in a Multithreaded Context in Apache Software Foundation Apache Struts
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.
CVSS v3.1
Score 4.3medium
Affected software
pkg:maven/org.apache.struts/struts2-coreRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability arises from unsynchronized access to per-request parsing state in the JSON plugin of Apache Struts 7.2.1. The shared parsing state across concurrent requests can lead to exposure of data elements from one session to another and prevent configured parsing limits from being enforced properly. The flaw only affects applications that enable populating actions from a JSON request body, which is not enabled by default. The issue is resolved by upgrading to Apache Struts 7.3.0.
Potential Impact
An attacker could observe data associated with other concurrent requests due to shared parsing state, leading to partial data exposure (confidentiality impact). There is no impact on integrity or availability. The vulnerability requires network access with low privileges and no user interaction. The overall impact is limited to information disclosure.
Mitigation Recommendations
Users should upgrade Apache Struts from version 7.2.1 to 7.3.0, where this vulnerability is fixed. Since the vulnerability only affects applications using the JSON plugin with populating actions from JSON request bodies enabled, disabling this feature if not needed can also mitigate exposure. No other official remediation level or patch links are provided, so checking the vendor advisory for updates is recommended.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- apache
- Date Reserved
- 2026-08-13T11:51:27.818Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a804609bf8831d539f35a7f
Added to database: 08/15/2026, 10:57:13 UTC
Last enriched: 08/22/2026, 13:24:45 UTC
Last updated: 09/06/2026, 22:52:13 UTC
Views: 57
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