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Vulnerability · Published Oct 6, 2026 · Assigned by apache

CVE-2026-105111Apache Commons BCEL: Class2HTML emits unescaped class strings, enabling stored XSS

Medium 4.7

In plain English

A medium-severity cross-site scripting in Apache Commons BCEL from Apache Software Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.7Medium
Exploit odds (30 days)0.2%top 83.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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 packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12bcelno fix listedDEBIAN-CVE-2026-105111
Debian:13bcelno fix listedDEBIAN-CVE-2026-105111
Debian:14bcel6.13.0-1DEBIAN-CVE-2026-105111
Ubuntu:22.04:LTSbcelno fix listedUBUNTU-CVE-2026-105111
Ubuntu:24.04:LTSbcelno fix listedUBUNTU-CVE-2026-105111
Ubuntu:26.04:LTSbcelno fix listedUBUNTU-CVE-2026-105111
Ubuntu:26.10bcelno fix listedUBUNTU-CVE-2026-105111
Ubuntu:22.04:LTSopenjdk-17no fix listedUBUNTU-CVE-2026-105111
Ubuntu:24.04:LTSopenjdk-17no fix listedUBUNTU-CVE-2026-105111
Ubuntu:26.04:LTSopenjdk-17no fix listedUBUNTU-CVE-2026-105111
Ubuntu:26.10openjdk-17no fix listedUBUNTU-CVE-2026-105111
Ubuntu:26.04:LTSopenjdk-17-cracno fix listedUBUNTU-CVE-2026-105111
Ubuntu:26.10openjdk-17-cracno fix listedUBUNTU-CVE-2026-105111
Ubuntu:22.04:LTSopenjdk-18no fix listedUBUNTU-CVE-2026-105111
Ubuntu:22.04:LTSopenjdk-21no fix listedUBUNTU-CVE-2026-105111
Ubuntu:24.04:LTSopenjdk-21no fix listedUBUNTU-CVE-2026-105111
Ubuntu:26.04:LTSopenjdk-21no fix listedUBUNTU-CVE-2026-105111
Ubuntu:26.10openjdk-21no fix listedUBUNTU-CVE-2026-105111
Ubuntu:26.04:LTSopenjdk-21-cracno fix listedUBUNTU-CVE-2026-105111
Ubuntu:26.10openjdk-21-cracno fix listedUBUNTU-CVE-2026-105111
Ubuntu:22.04:LTSopenjdk-25no fix listedUBUNTU-CVE-2026-105111
Ubuntu:24.04:LTSopenjdk-25no fix listedUBUNTU-CVE-2026-105111
Ubuntu:26.04:LTSopenjdk-25no fix listedUBUNTU-CVE-2026-105111
Ubuntu:26.10openjdk-25no fix listedUBUNTU-CVE-2026-105111
Ubuntu:22.04:LTSopenjdk-8no fix listedUBUNTU-CVE-2026-105111
Ubuntu:24.04:LTSopenjdk-8no fix listedUBUNTU-CVE-2026-105111
Ubuntu:26.04:LTSopenjdk-8no fix listedUBUNTU-CVE-2026-105111
Ubuntu:26.10openjdk-8no fix listedUBUNTU-CVE-2026-105111
Ubuntu:22.04:LTSopenjdk-ltsno fix listedUBUNTU-CVE-2026-105111
Ubuntu:26.04:LTSopenjdk-ltsno fix listedUBUNTU-CVE-2026-105111
Ubuntu:26.10openjdk-ltsno fix listedUBUNTU-CVE-2026-105111

Affected products (as reported)

VendorProductVersions
Apache Software Foundation Apache Commons BCEL 0 – before 6.13.00 – before fb72c225cbc6ec3d94060ed6edb269f07428d504

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N

References