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Medium severity · published Aug 15, 2026
CVE-2026-73632
Apache Struts: Shared serialization 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-response serialization state could be shared across concurrent requests, allowing response content associated with one request to become observable in another. Only the SMD / JSON-RPC handling of the JSON interceptor is affected, which is not enabled by default; applications using the json result type 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-2026-73632
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-73632
Vendor Advisory
https://cwiki.apache.org/confluence/display/WW/S2-071
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