Vulnerability 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.
CVSS Score
CRITICAL
Related Weaknesses (CWE)
References
- https://github.com/lightpanda-io/browser/commit/0588cc374d4af9687cf6f45a7d52f7af
- https://github.com/lightpanda-io/browser/pull/1998
- https://github.com/lightpanda-io/browser/releases/tag/0.3.1
- https://github.com/lightpanda-io/browser/security/advisories/GHSA-mq6p-m9cc-q432
FAQ
What is CVE-2026-52842?
CVE-2026-52842 is a vulnerability with a CVSS score of 9.3 (CRITICAL). 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 or...
How severe is CVE-2026-52842?
CVE-2026-52842 has been rated CRITICAL with a CVSS base score of 9.3/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-52842?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.