Bug 2530096 (CVE-2026-85484)

Summary: CVE-2026-85484 perl-HTML-FormHandler: HTML::FormHandler: Cross-Site Scripting (XSS) via unescaped HTML labels
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in HTML::FormHandler for Perl. This vulnerability allows a remote attacker to inject malicious script into web pages. The component fails to properly escape option group labels and radio button labels when rendering them into HTML. This can lead to Cross-Site Scripting (XSS) attacks, enabling an attacker to execute arbitrary code in the user's browser, potentially leading to information disclosure or unauthorized actions.
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Bug Depends On: 2533728    
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Description OSIDB Bzimport 2026-09-08 20:24:38 UTC 
HTML::FormHandler versions before 0.410002 for Perl render option group labels and radio button labels into HTML without escaping.

The Select, RadioGroup, CheckboxGroup and HorizCheckboxGroup widgets render a group label unescaped, Select into a label attribute and the other three into element content. RadioGroup also renders each radio button's own label unescaped.

Any application whose option list is built from data rather than literals, using options_from, an options_fieldname method, or the DBIC model, allows attacker-influenced text in a label that can override the options or embed JavaScript in rendered pages.