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Fencer Intel
medium 4.7

CVE-2026-105111 json

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

published last mo. modified last mo. also EUVD-2026-93972

cvss
4.7
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 16%
public exploits
0
none known

Summary

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.

Patch / fix

  • Apache Software Foundation Apache Commons BCEL 6.13.0
  • bcel Debian 14 6.13.0-1

debian advisories DEBIAN-CVE-2026-105111

  • bcel SLES for SAP applications 16.0, SLES 16.0 6.13.0-160000.1.1

suse advisories SUSE-SU-2026:24258-1

  • bcel openSUSE Leap 16.0 6.13.0-160000.1.1
  • bcel openSUSE Tumbleweed 6.13.0-1.1

opensuse advisories openSUSE-SU-2026:22109-1openSUSE-SU-2026:12080-1

Is CVE-2026-105111 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-105111 updated cvss 4.7

org.apache.bcel/bcel: Apache Commons BCEL: Stored Cross-Site Scripting via untrusted class files in Class2HTML

  • Red Hat build of Apache Camel 4 for Quarkus 3 bcel 6.7.0
    affected: workaround, no fix available
  • Red Hat Enterprise Linux 7 maven-shared-jar-javadoc, maven-shared-jar 1.1-8.el7 Red Hat Enterprise Linux 9 bcel 6.7.0, bcel 6.8.1-4.el10 Red Hat Enterprise Linux 10 bcel 6.8.1-4.el10 Red Hat Enterprise Linux AI (RHEL AI) 3 bazel6 6.5.0-2.el9ai
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Fuse 7 bcel 6.7.0
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat JBoss Web Server 6 jws6-tomcat-jakartaee-migration
    affected: workaround, no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
last mo.

Exploit prediction

0.25% chance of exploitation in the next 30 days, higher than 16% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 4.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
CNA 4.0 2.3 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
CNA 4.0 2.3 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

  • Apache Software Foundation Apache Commons BCEL

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

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