Bug 2533729

Summary: CVE-2026-85485 perl-HTML-FormHandler: HTML::FormHandler: Cross-Site Scripting via unescaped error messages [fedora-all]
Product: [Fedora] Fedora Reporter: Vladimir Vasilev <vvasilev>
Component: perl-HTML-FormHandlerAssignee: Emmanuel Seyman <emmanuel>
Status: CLOSED ERRATA QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: high Docs Contact:
Priority: high    
Version: rawhideCC: emmanuel, perl-devel
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["a90a66d9-6b36-4ba4-a5eb-d0419ea9ab23"]}
Fixed In Version: perl-HTML-FormHandler-0.410002-1.fc44 Doc Type: ---
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2026-09-22 00:54:01 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 2530115    

Description Vladimir Vasilev 2026-09-15 12:34:50 UTC 
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 0.410002 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.
Comment 1 Fedora Update System 2026-09-15 13:50:51 UTC 
FEDORA-2026-21850d7df0 (perl-HTML-FormHandler-0.410002-1.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-21850d7df0
Comment 2 Fedora Update System 2026-09-22 00:54:01 UTC 
FEDORA-2026-21850d7df0 (perl-HTML-FormHandler-0.410002-1.fc44) has been pushed to the Fedora 44 stable repository.
If problem still persists, please make note of it in this bug report.