https://bugzilla.redhat.com/show_bug.cgi?id=2533273
Bug ID: 2533273
Summary: CVE-2026-19872 perl-HTML-FormHandler:
HTML::FormHandler: Cross-site scripting via unescaped
error messages [fedora-all]
Product: Fedora
Version: rawhide
Status: NEW
Whiteboard: {"flaws": ["2676ed70-77c5-42e8-9f28-a33747bb106d"]}
Component: perl-HTML-FormHandler
Keywords: Security, SecurityTracking
Severity: medium
Priority: medium
Assignee: [email protected]
Reporter: [email protected]
QA Contact: [email protected]
CC: [email protected], [email protected]
Blocks: 2530105 (CVE-2026-19872)
Target Milestone: ---
Classification: Fedora
Disclaimer: Community trackers are created by Red Hat Product Security team on
a best effort basis. Package maintainers are required to ascertain if the flaw
indeed affects their package, before starting the update process.
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.
Referenced Bugs:
https://bugzilla.redhat.com/show_bug.cgi?id=2530105
[Bug 2530105] CVE-2026-19872 perl-HTML-FormHandler: HTML::FormHandler:
Cross-site scripting via unescaped error messages
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