Apache Tomcat has a Cross-site Scripting vulnerability

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

• CISA KEV Not listed.
• EPSS 0.041, the 90th percentile, on 8 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

1. 29 Jun 2026, 21:32 UTC Confirmed by GitHub Advisory Database
2. 4 Nov 2026, 17:10 UTC Confirmed by OSV

Sources

• GitHub Advisory Database: GHSA-pg42-rg8c-j886
• OSV: GHSA-pg42-rg8c-j886
• nvd.nist.gov/vuln/detail/CVE-2026-50229
• github.com/apache/tomcat/commit/0d5bdd5b0dd964e9f73e530b7d753462b9bfd1d0
• github.com/apache/tomcat/commit/1fe95d841e9d461a16069974142d12c3ef68819a
• github.com/apache/tomcat/commit/de5a950415fc67713f17fab63d0c7809e0fca80b
• github.com/apache/tomcat
• lists.apache.org/thread/wlt2no8bw45zl1w8byop4zfqphldf5j0
• tomcat.apache.org/security-10.html
• tomcat.apache.org/security-11.html
• tomcat.apache.org/security-9.html
• www.openwall.com/lists/oss-security/2026/06/29/20

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.