CVE-2026-52842 | Lightpanda is a headless browser designed for AI and automat… | CVSS 9.3 CRITICAL

Description

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.

Metadata

CVE ID: CVE-2026-52842
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-06-08 18:41 UTC
Published: 2026-07-15 16:18 UTC
Last updated: 2026-07-15 16:35 UTC
Primary CWE: CWE-346
CWE-346: Origin Validation Error
Vendor / Product: lightpanda-io / browser
Sources: cve.org · NVD

Severity & Metrics

9.3 CRITICAL CVSS 3.1

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

SSVC — CISA Coordinator

Exploitation: none
Automatable: no
Tech. Impact: total

Affected products (1)

Vendor	Product	Platform	Versions
lightpanda-io	browser	—	< 0.3.1

Weakness (CWE)

CWE	Source	Description
CWE-346	cna	CWE-346: Origin Validation Error

CVSS scores (1)

Score	Severity	Version	Source	Vector
9.3	CRITICAL	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

References (4)

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