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CVE-2026-19872— HTML::FormHandler versions before 0.410000 for Perl allow cross-site scripting via a submitted value rendered unescaped in an error message

Quick assessment

Affected
CVE-2026-19872
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.

HTML::FormHandler 0.410000 及更早版本存在跨站脚本（XSS）漏洞：提交到表单字段的值在错误消息中未被转义地渲染，导致脚本可在浏览器中执行。 具体来说，负责输出表单错误的包装器和渲染器会直接将错误字符串插入 HTML 中，且未进行任何转义处理。该库自身有两条内置错误消息—— 和 ——会将用户提交的值直接拼接进错误字符串；此外，当类型约束校验失败时，被拒绝的值也会被放入由 传递给 的错误消息中。 只要字段声明了正则表达式校验、校验列表或类型约束，且未使用自定义验证器或非常规配置，就可能触发上述

AI Predicted 6.1 Difficulty: Easy

I. Basic Information for CVE-2026-19872

Vulnerability Information
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Vulnerability Title
HTML::FormHandler versions before 0.410000 for Perl allow cross-site scripting via a submitted value rendered unescaped in an error message
Source: CVE Program / CVE List V5
Vulnerability Description
HTML::FormHandler versions before 0.410000 for Perl allow cross-site scripting via a submitted value rendered unescaped in an error message. The wrappers and renderers that emit a form's errors interpolate the error string straight into HTML with no escaping. Two of the library's own messages, no_match and not_allowed, splice the submitted value into that string, and a failing type constraint puts the rejected value into the message it builds, which _apply_actions hands to add_error. A field declared with a check regexp, a check list or a type constraint reaches those messages, with no custom validator and no non-default configuration. Errors rendered through an application's own escaping template layer rather than the library's rendering roles are not affected. A request over the network that submits markup to such a field gets it back live inside the error span, running script in the victim's origin. Re-rendering a rejected value later gives the stored variant.
Source: CVE Program / CVE List V5
CVSS Information
N/A
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
- - 0 ~ 0.410000 -

II. Public POCs for CVE-2026-19872

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III. Intelligence Information for CVE-2026-19872

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Patches & Fixes for CVE-2026-19872 (1)

Vendor Pages for CVE-2026-19872 (1)

IV. Related Vulnerabilities

Same weakness: CWE-79

V. Comments for CVE-2026-19872

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