CVE-2026-105111: Apache Software Foundation Apache Commons Bcel

Medium severity, CVSS 4.7. EPSS: 0.3% chance of exploitation in the next 30 days.

Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in Apache Commons BCEL. This only happens when you're using Class2HTML to generate webpages for possibly-attacker-controlled class files, where Class2HTML emitters write attacker class-file strings into HTML unescaped (stored XSS in reports). This issue affects Apache Commons BCEL: before 6.13.0. Users are recommended to upgrade to version 6.13.0, which fixes the issue.

Affected products

• Apache Software Foundation Apache Commons Bcel: before 6.13.0 (fixed in 6.13.0)

Published 2026-10-06. Last modified 2026-10-07.