CVE-2026-52842

CRITICAL9.3

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

Published Jul 15, 2026

Modified 1 months ago

Details

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.

References

WEB

https://github.com/lightpanda-io/browser/commit/0588cc374d4af9687cf6f45a7d52f7af04bbacfb

WEB

https://github.com/lightpanda-io/browser/pull/1998

WEB

https://github.com/lightpanda-io/browser/releases/tag/0.3.1

WEB

https://github.com/lightpanda-io/browser/security/advisories/GHSA-mq6p-m9cc-q432

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2026-52842

CVSS Analysis