CVE-2026-85484 HTML::FormHandler versions before 0.410002 for Perl render option group labels and radio button labels into HTML without escaping.
Attacker can inject JavaScript via unescaped form labels in HTML::FormHandler, leading to XSS in applications using dynamic options.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-85484?
CVE-2026-85484 is a medium-severity cross-site scripting vulnerability, published on 8 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-79
Which versions are affected by CVE-2026-85484?
How do I fix CVE-2026-85484?
Upgrade to a fixed version.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-85484 being exploited?
There is no known exploitation of CVE-2026-85484 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-85484, GHSA-mwmv-8rm6-755x, UBUNTU-CVE-2026-85484.