CVE-2020-17531: Apache Tapestry

Critical severity, CVSS 9.8. EPSS: 10% chance of exploitation in the next 30 days.

A Java Serialization vulnerability was found in Apache Tapestry 4. Apache Tapestry 4 will attempt to deserialize the "sp" parameter even before invoking the page's validate method, leading to deserialization without authentication. Apache Tapestry 4 reached end of life in 2008 and no update to address this issue will be released. Apache Tapestry 5 versions are not vulnerable to this issue. Users of Apache Tapestry 4 should upgrade to the latest Apache Tapestry 5 version.

Affected products

• Apache Tapestry: from 4.0.0, before 5.0.1 (fixed in 5.0.1)

Published 2020-12-08. Last modified 2026-06-17.