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Medium severity · published Aug 15, 2026
CVE-2026-73631
Apache Struts: Shared parsing state in the JSON plugin
4.3
CVSS
0.4%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 31% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ST
Struts · Apache
7.2.1 · source: vendor, NVD
Affected product
ST
Struts
Apache
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-73631
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-73631
Vendor Advisory
https://cwiki.apache.org/confluence/display/WW/S2-070
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