CVE-2026-105111

MEDIUM 4.7

Apache Commons BCEL: Class2HTML emits unescaped class strings, enabling stored XSS

CVSS Score

4.7

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-79
Vendor	apache software foundation
Product	apache commons bcel
Published	Oct 6, 2026
Last Updated	Oct 6, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Affected Versions

Apache Software Foundation / Apache Commons BCEL

0 < 6.13.0 0 < fb72c225cbc6ec3d94060ed6edb269f07428d504

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/apache/commons-bcel/commit/fb72c225cbc6ec3d94060ed6edb269f07428d504.patch lists.apache.org: https://lists.apache.org/thread.html/co1wfk2lyrmpnfhn49o370pvfl978rw6

Credits

The Apache Software Foundation Claude Security