CVE-2026-73180 Apache Tomcat: Authenticated WebSocket session survives end of HTTP session
Authenticated WebSocket sessions persist after HTTP session termination, allowing unauthorized access to active connections.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-73180?
CVE-2026-73180 is a medium-severity missing authorization vulnerability in Apache Tomcat, published on 25 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-613
Which versions are affected by CVE-2026-73180?
1 open source package ship an affected version, including tomcat. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
tomcat Bitnami | From 7.0.43 | 9.0.121, 10.1.58, 11.0.25 |
Products include Apache Tomcat.
How do I fix CVE-2026-73180?
Upgrade tomcat to a fixed version for your release line: 9.0.121, 10.1.58 or 11.0.25.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-73180 being exploited?
There is no known exploitation of CVE-2026-73180 in the wild and no public exploit code.
Other vulnerabilities in Apache Tomcat
Sources
Also known as BIT-tomcat-2026-73180, CLSA-2026-1788514837, DEBIAN-CVE-2026-73180, GHSA-wrvx-pxxf-g8fg, MINI-43h7-vrmw-x88m, MINI-rpfx-cgmc-hrhv and 2 more.