What is CVE-2026-105111?

CVE-2026-105111 is a medium-severity vulnerability in Apache Software Foundation Commons Bcel, classified under Cross-site Scripting. CVSS score: 4.7/10. Published 2026-10-06.

How severe is CVE-2026-105111?

Medium severity. CVSS v3 base score is 4.7 out of 10.

XSS in Apache Software Foundation Commons Bcel

CVE-2026-105111

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.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-10-06 · last modified 2026-10-07.

CVSS v3 metric

CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Apache Software Foundation Commons Bcel

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

Frequently asked questions

What is CVE-2026-105111?: CVE-2026-105111 is a medium-severity vulnerability in Apache Software Foundation Commons Bcel, classified under Cross-site Scripting. CVSS score: 4.7/10. Published 2026-10-06.
How severe is CVE-2026-105111?: Medium severity. CVSS v3 base score is 4.7 out of 10.