CVE-2026-73180

Insufficient Session Expiration vulnerability in Apache Tomcat meant that if the session ID for an authenticated HTTP session was changed after a WebSocket connection had been established under that authenticated HTTP session, the WebSokcet session would not be closed as required by the Jakarta WebSocket specification when the HTTP session ended. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.24, from 10.1.0-M1 through 10.1.57, from 9.0.0.M1 through 9.0.120. The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.0 through 8.5.100, from 7.0.43 through 7.0.109. Other unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.25, 10.1.58 or 9.0.121, which fix the issue.

We have discovered 5,519 live websites that are affected by CVE-2026-73180.

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Affected Software

Product	Apache Tomcat
Category	Web Servers
Vulnerable Domains	5,519 live websites (77% of Apache Tomcat install base)
Vulnerable Versions	from 7.0.43 through 7.0.109 from 8.5 through 8.5.100 from 9 through 9.0.120 from 10.1 through 10.1.57 from 11 through 11.0.24
Vulnerable Versions Count	277 versions ( 73% of all versions)