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

Quick assessment

Affected
Apache Software Foundation Apache Commons BCEL
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Apache Commons BCEL 中在生成网页时存在不恰当的对输入进行中性化处理（即“跨站脚本攻击”，XSS）的漏洞。 该问题仅在使用 Class2HTML 为可能由攻击者控制的类文件生成网页时发生。Class2HTML 的 emitter 组件将攻击者提供的类文件字符串以未转义的方式直接写入 HTML 中，从而导致存储型 XSS（在报告中出现）。 此漏洞影响 Apache Commons BCEL 6.13.0 之前的版本。 建议用户升级至 6.13.0 版本，该版本已修复此问题。

CVSS 4.7 · Medium

Affected Version Matrix 2

VendorProduct Version RangeStatus
Apache Software Foundation Apache Commons BCEL < 6.13.0 affected
< fb72c225cbc6ec3d94060ed6edb269f07428d504 affected
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I. Basic Information for CVE-2026-105111

Vulnerability Information
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Vulnerability Title
Apache Commons BCEL: Class2HTML emits unescaped class strings, enabling stored XSS
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache Commons BCEL 0 ~ 6.13.0 -

II. Public POCs for CVE-2026-105111

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III. Intelligence Information for CVE-2026-105111

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Other References for CVE-2026-105111 (2)

Same Patch Batch · Apache Software Foundation · 2026-10-06 · 8 CVEs total

CVE-2026-94114 5.9 MEDIUM Apache Commons BCEL: Nested Code/Record attributes drive unbounded parse-time recursion in
CVE-2026-105244 5.3 MEDIUM Apache log4net: RemoteSyslogAppender silently deletes non-ASCII content
CVE-2026-105243 5.3 MEDIUM Apache log4net: Oversize EventLogAppender record silently discarded
CVE-2026-105242 5.3 MEDIUM Apache log4net: Request validation failure drops the event in the aspnet-request converter
CVE-2026-105241 5.3 MEDIUM Apache log4net: Unencodable content discards a whole SmtpPickupDirAppender batch
CVE-2026-105240 5.3 MEDIUM Apache log4net: NUL character truncates OutputDebugStringAppender records
CVE-2026-105239 5.3 MEDIUM Apache log4net: NUL character truncates EventLogAppender records

IV. Related Vulnerabilities

Same product: Apache Commons BCEL
Same vendor: Apache Software Foundation
Same weakness: CWE-79

V. Comments for CVE-2026-105111

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