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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-52842
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-15 17:16:50 UTC
Updated2026-07-15 20:49:41 UTC
DescriptionLightpanda 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.

Risk And Classification

Primary CVSS: v3.1 9.3 CRITICAL from [email protected]

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

EPSS: 0.001610000 probability, percentile 0.056930000 (date 2026-07-20)

Problem Types: CWE-346 | CWE-346 CWE-346: Origin Validation Error

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9.3CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
3.1CNADECLARED9.3CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Lightpanda-io Browser affected < 0.3.1 Not specified

References

ReferenceSourceLinkTags
github.com/lightpanda-io/browser/pull/1998 [email protected] github.com
github.com/lightpanda-io/browser/commit/0588cc374d4af9687cf6f45a7d52f7af... [email protected] github.com
github.com/lightpanda-io/browser/security/advisories/GHSA-mq6p-m9cc-q432 [email protected] github.com
github.com/lightpanda-io/browser/releases/tag/0.3.1 [email protected] github.com
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