CVE-2026-73631
MediumCVSS 4.3Exploitation Probability (EPSS)
Low risk14th percentile - higher than 14% of all known CVEs
Summary
A vulnerability in the JSON plugin of Apache Struts allows per-request parsing state to be shared across concurrent requests, potentially exposing data from one request to another and not enforcing configured parsing limits. Populating actions from JSON request bodies is not enabled by default, so applications not using the JSON plugin are unaffected.
Risk Assessment
The risk involves potential data leakage between requests and possible bypass of limits, which could lead to unauthorized information access or system overload.
Recommendation
Upgrade Apache Struts to version 7.3.0, which fixes the issue. If you do not use the JSON plugin, no further action is required.
Other vulnerabilities in Apache Struts
See all- CVE-2016-3090High
The TextParseUtil.translateVariables method in Apache Struts 2.x before version 2.3.20 allows remote attackers to execute arbitrary code via a crafted OGNL expression using ANTLR tooling.
- CVE-2016-4461High
Apache Struts 2.x before version 2.3.29 allows remote attackers to execute arbitrary code via a "%{}" sequence in a tag attribute, known as forced double OGNL evaluation.
- CVE-2017-9804High
In Apache Struts versions 2.3.7 through 2.3.33 and 2.5 through 2.5.12, it is possible to prepare a special URL that can overload the server process during URL validation in a form. This issue exists due to an incomplete fix for S2-047 / CVE-2017-7672.
- CVE-2015-5209High
Apache Struts 2.x before version 2.3.24.1 allows remote attackers to manipulate Struts internals, which may lead to altering user sessions or affecting container settings.
- CVE-2017-9787High
Using Spring AOP functionality to secure Struts actions can lead to a DoS attack.
- CVE-2016-4433High
Apache Struts 2 versions 2.3.20 through 2.3.28.1 allows remote attackers to bypass intended access restrictions and conduct redirection attacks via a crafted request.
- CVE-2016-4431High
Apache Struts 2 versions 2.3.20 through 2.3.28.1 allow remote attackers to bypass intended access restrictions and conduct redirection attacks by leveraging a default method.
- CVE-2016-4430High
Apache Struts 2 versions 2.3.20 through 2.3.28.1 mishandle token validation, allowing remote attackers to conduct cross-site request forgery (CSRF) attacks via unspecified vectors.
- CVE-2016-0785High
Apache Struts 2.x before version 2.3.28 allows remote attackers to execute arbitrary code via a "%{}" sequence in a tag attribute, known as forced double OGNL evaluation.
- CVE-2015-1831High
The default exclude patterns (excludeParams) in Apache Struts 2.3.20 allow remote attackers to compromise internal state of an application via unspecified vectors.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS