CVE-2026-73631

Analyzed Analyzed - Analysis Complete

JSON Plugin Session Data Exposure in Apache Struts

Publication date: 2026-08-15

Last updated on: 2026-08-18

Assigner: Apache Software Foundation

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 Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-08-15

Last Modified

2026-08-18

Generated

2026-09-05

AI Q&A

2026-08-15

EPSS Evaluated

2026-09-03

NVD

CVE-2026-73631

EUVD

EUVD-2026-59605

Affected Vendors & Products

Vendor	Product	Version / Range
apache	struts	7.2.1

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-567	The product does not properly synchronize shared data, such as static variables across threads, which can lead to undefined behavior and unpredictable data changes.

Attack-Flow Graph

Executive Summary

This vulnerability involves a data exposure issue in Apache Struts' JSON plugin. It allows the parsing state of one request to be shared with another concurrent request, potentially exposing data from one request to another. This happens because parsing limits are not enforced correctly across requests.

Detection Guidance

Detection requires checking if Apache Struts version 7.2.1 is installed and if the JSON plugin is enabled. Verify the version using server logs or application metadata. If the JSON plugin is used, inspect request handling for concurrent session data exposure.

Impact Analysis

If you use Apache Struts with the JSON plugin enabled, an attacker could exploit this to access sensitive data from other users' requests. This could lead to unauthorized data disclosure or manipulation. Applications not using the JSON plugin are not affected.

Compliance Impact

This vulnerability could lead to unauthorized data exposure, which may violate GDPR's data protection principles or HIPAA's security requirements for safeguarding sensitive information. Compliance could be impacted if user data is compromised.

Mitigation Strategies

Upgrade Apache Struts to version 7.3.0 or later to address the vulnerability in the JSON plugin.

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