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CVE PROGRAM SOURCE RECORD9.3 Critical

CVE-2026-52842

Lightpanda:URL parser misidentifies page origin for URLs containing @ in the path - Same-Origin Policy bypass

Description

Lightpanda is a headless browser designed for AI and automation. Prior to 0.3.1, Lightpanda searched for @ across the entire URL string instead of only the authority component when computing a page origin, so a URL such as `http://attacker.com/@victim.com/` was fetched from attacker.com but treated as `http://victim.com`, allowing a complete Same-Origin Policy bypass. This issue is fixed in version 0.3.1.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

lightpanda-io browser

  • < 0.3.1affected

References