CVE-2026-52842

Summary

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 Software

Weaknesses

• CWE-346: CWE-346: Origin Validation Error

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: total

References

• https://github.com/lightpanda-io/browser/security/advisories/GHSA-mq6p-m9cc-q432
• https://github.com/lightpanda-io/browser/pull/1998
• https://github.com/lightpanda-io/browser/commit/0588cc374d4af9687cf6f45a7d52f7af04bbacfb
• https://github.com/lightpanda-io/browser/releases/tag/0.3.1

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