CVE-2026-52842

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 v3 9.3 CRITICAL

9.3^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 2.8 / Impact : 5.8

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope CHANGED

References

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

Configurations

No configuration.

History

15 Jul 2026, 17:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-07-15 17:16

Updated : 2026-07-15 20:49

NVD link : CVE-2026-52842

Mitre link : CVE-2026-52842

CVE.ORG link : CVE-2026-52842

JSON object : View

Products Affected

No product.

CWE

CWE-346

Origin Validation Error

{"id": "CVE-2026-52842", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-52842", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-07-15T16:35:12.169514Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 9.3, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.8, "exploitabilityScore": 2.8}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "lightpanda-io", "product": "browser", "versions": [{"status": "affected", "version": "< 0.3.1"}]}]}], "published": "2026-07-15T17:16:50.317", "references": [{"url": "https://github.com/lightpanda-io/browser/commit/0588cc374d4af9687cf6f45a7d52f7af04bbacfb", "source": "security-advisories@github.com"}, {"url": "https://github.com/lightpanda-io/browser/pull/1998", "source": "security-advisories@github.com"}, {"url": "https://github.com/lightpanda-io/browser/releases/tag/0.3.1", "source": "security-advisories@github.com"}, {"url": "https://github.com/lightpanda-io/browser/security/advisories/GHSA-mq6p-m9cc-q432", "source": "security-advisories@github.com"}], "vulnStatus": "Deferred", "weaknesses": [{"type": "Primary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-346"}]}], "descriptions": [{"lang": "en", "value": "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."}], "lastModified": "2026-07-15T20:49:41.640", "sourceIdentifier": "security-advisories@github.com"}