Vulnerability in Apache Software Foundation Apache Struts

[ Why it matters ]Priority signals

• Critical severity: CVSS 9.8

[ Description ]Official description

Improper neutralization of special elements used in an expression language statement ('Expression Language Injection') vulnerability in Apache Struts. If the application is configured to use the legacy RESTful action mapper, a crafted request can inject an OGNL expression that may lead to remote code execution. Struts 7 is affected only when the OGNL allowlist is disabled; it is enabled by default. Applications using the default action mapper, the restful2 mapper, or the Struts REST plugin are not affected. This issue affects Apache Struts: from 2.0.0 through 2.3.37, from 2.5.0 through 2.5.33, from 6.0.0 through 6.11.0, from 7.0.0 through 7.3.0. Users are recommended to upgrade to version 6.12.0 or 7.4.0, which fixes the issue.

[ Fixes ]Fixes and patches

• Security bulletin: Apache Struts S2-077Vendor patch or bulletin · CERT-FR · cwiki.apache.org/confluence/display/WW/S2-077, cited by CERT-FR CERTFR-2026-AVI-1290
• Security bulletin: Apache Struts S2-076Vendor patch or bulletin · CERT-FR · cwiki.apache.org/confluence/display/WW/S2-076, cited by CERT-FR CERTFR-2026-AVI-1290
• Security bulletin: Apache Struts S2-075Vendor patch or bulletin · CERT-FR · cwiki.apache.org/confluence/display/WW/S2-075, cited by CERT-FR CERTFR-2026-AVI-1290
• Security bulletin: Apache Struts S2-078Vendor patch or bulletin · CERT-FR · cwiki.apache.org/confluence/display/WW/S2-078, cited by CERT-FR CERTFR-2026-AVI-1290

[ Advisories ]Government CERT advisories

• CERT-FR9 Oct 2026CERTFR-2026-AVI-1290

  Multiple vulnerabilities in Apache Struts Translated from French

  Multiple vulnerabilities have been discovered in Apache Struts. Some of them allow an attacker to cause remote arbitrary code execution, remote denial of service and a breach of data confidentiality. The vendor states…

  CVE-2026-104714CVE-2026-104711CVE-2026-104713+1 more CVEs
• BSI CERT-Bund4 Oct 2026WID-SEC-2026-3723

  Apache Struts: Multiple vulnerabilities Translated from German

  CVE-2026-104711CVE-2026-104714CVE-2026-104713+1 more CVEs

[ References ]References

• cwiki.apache.org/confluence/display/WW/S2-075Vendor Advisory
• www.openwall.com/lists/oss-security/2026/10/05/10Mailing ListThird Party Advisory