CVE-2015-5346 Improper Neutralization of Input During Web Page Generation in Apache Tomcat

What is CVE-2015-5346?

CVE-2015-5346 is a high-severity authentication bypass vulnerability in Apache Tomcat, published on 25 Feb 2016. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Session fixation vulnerability in Apache Tomcat 7.x before 7.0.66, 8.x before 8.0.30, and 9.x before 9.0.0.M2, when different session settings are used for deployments of multiple versions of the same web application, might allow remote attackers to hijack web sessions by leveraging use of a requestedSessionSSL field for an unintended request, related to CoyoteAdapter.java and Request.java.

Which versions are affected by CVE-2015-5346?

6 open source packages ship an affected version, including org.apache.tomcat:tomcat. It affects 3 products.

Products include Apache Tomcat, Canonical Ubuntu Linux, Debian Debian Linux.

How do I fix CVE-2015-5346?

Upgrade org.apache.tomcat:tomcat to a fixed version for your release line: 7.0.66, 8.0.31 or 9.0.0.M2.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2015-5346 being exploited?

There is no known exploitation of CVE-2015-5346 in the wild and no public exploit code.

Other vulnerabilities in Apache Tomcat

• CVE-2025-24813 Apache Tomcat Path Equivalence Exploited Critical 10.0
• CVE-2016-8735 Apache Tomcat Remote Code Execution Exploited Critical 9.8
• CVE-2017-12617 Apache Tomcat Remote Code Execution Exploited High 8.1
• CVE-2017-12615 Apache Tomcat on Windows Remote Code Execution Exploited High 8.1
• CVE-2026-34486 Apache Tomcat Missing Encryption of Sensitive Data Exploited High 7.5

All Apache Tomcat vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-jrcp-c39h-r29x, UBUNTU-CVE-2015-5346.