CVE-2026-85630 HTML::FormHandler versions before 0.410002 for Perl render field attributes into HTML without escaping using the process_attrs method.
Attacker can inject JavaScript via unescaped field attributes in HTML::FormHandler, leading to cross-site scripting in Perl applications.
- 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-2026-85630?
CVE-2026-85630 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 field attributes into HTML without escaping using the process_attrs method.
Any application with fields or field labels where some attributes are built from data rather than literals allows attacker-influenced text in an attribute value that can override the field attributes or embed JavaScript in rendered pages.
For example, the RadioGroup widget uses the process_attrs method via the render_option and wrap_radio methods.
Weakness: CWE-79
Which versions are affected by CVE-2026-85630?
How do I fix CVE-2026-85630?
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-2026-85630 being exploited?
There is no known exploitation of CVE-2026-85630 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-85630, GHSA-4qf4-6x5x-m29p, UBUNTU-CVE-2026-85630.