CVE-2026-52842

CRITICAL 9.3

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

CVSS Score

9.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-346
Vendor	lightpanda-io
Product	browser
Published	Jul 15, 2026
Last Updated	Jul 15, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

High

Integrity

High

Availability

None

Affected Versions

lightpanda-io / browser

< 0.3.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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