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.
Analysis
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Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
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Vendor Solution
Upgrade to HTML-FormHandler 0.410000 or later.
Tracking
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Thu, 10 Sep 2026 18:30:00 +0000
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cvssV3_1
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Tue, 08 Sep 2026 23:30:00 +0000
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Tue, 08 Sep 2026 20:15:00 +0000
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| 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. | |
| Title | HTML::FormHandler versions before 0.410000 for Perl allow cross-site scripting via a submitted value rendered unescaped in an error message | |
| Weaknesses | CWE-79 | |
| References |
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Subscriptions
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MITRE
Status: PUBLISHED
Assigner: CPANSec
Published:
Updated: 2026-09-10T17:51:23.851Z
Reserved: 2026-08-14T12:49:19.665Z
Link: CVE-2026-19872
Vulnrichment
Updated: 2026-09-08T22:07:16.768Z
NVD
Status : Deferred
Published: 2026-09-08T20:17:29.850
Modified: 2026-09-10T18:17:58.827
Link: CVE-2026-19872
Redhat
No data.
OpenCVE Enrichment
Updated: 2026-09-09T10:30:09Z