PT-2026-60226 · Lightpanda Io · Browsers

Published 2026-07-15 · Updated 2026-07-15 · CVE-2026-52842

NVD

CVSS v3.1

9.3

Critical

Base vector

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

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.

Fix

Origin Validation Error

Weakness Enumeration

CWE-346

Related Identifiers

CVE-2026-52842

Affected Products

Browsers

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-52842 · Security Note
• https://github.com/lightpanda-io/browser/security/advisories/GHSA-mq6p-m9cc-q432 · Note
• https://github.com/lightpanda-io/browser/releases/tag/0.3.1 · Note
• https://github.com/lightpanda-io/browser/pull/1998 · Note
• https://github.com/lightpanda-io/browser/commit/0588cc374d4af9687cf6f45a7d52f7af04bbacfb · Note