Bug 2530115 (CVE-2026-85485)

Summary:	CVE-2026-85485 perl-HTML-FormHandler: HTML::FormHandler: Cross-Site Scripting via unescaped error messages
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	Keywords:	Security
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Hardware:	All
OS:	Linux
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Doc Text:	A flaw was found in HTML::FormHandler for Perl. This vulnerability allows a remote attacker to inject malicious script code into web pages. The component fails to properly escape certain error messages when rendered into HTML. This can lead to a Cross-Site Scripting (XSS) vulnerability, enabling an attacker to execute arbitrary script code in a user's browser, potentially compromising user sessions or disclosing sensitive information.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2533729
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Description OSIDB Bzimport 2026-09-08 20:25:26 UTC

HTML::FormHandler versions before 0.410002 for Perl render some error messages into HTML without escaping.

The Table form layout and the Bootstrap 2 and 3 wrappers splice each error string straight into the surrounding markup. Version 0.410000, the fix for CVE-2026-19872, escaped the equivalent values in the other layouts and wrappers, and 0.410002 extended that to these three.

Error messages that contain attacker-influenced content such as rejected field values could embed JavaScript in rendered pages.