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CVE-2026-52842— Lightpanda:URL parser misidentifies page origin for URLs containing @ in the path - Same-Origin Policy bypass

Quick assessment

Affected
lightpanda-io browser
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Lightpanda Browser是Lightpanda公司开源的一款无头浏览器。 Lightpanda Browser 0.3.1之前版本存在输入验证错误漏洞，该漏洞源于在计算页面源时在整个URL字符串中搜索@字符而非仅搜索授权组件，可能导致完全绕过同源策略。

CVSS 9.3 · Critical EPSS 0.25% · P14

Possible ATT&CK Techniques 2 AI

T1562 T1078 · Valid Accounts

Affected Version Matrix 1

VendorProduct Version RangeStatus
lightpanda-io browser < 0.3.1 affected
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I. Basic Information for CVE-2026-52842

Vulnerability Information
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Vulnerability Title
Lightpanda:URL parser misidentifies page origin for URLs containing @ in the path - Same-Origin Policy bypass
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
源验证错误
Source: CVE Program / CVE List V5
Vulnerability Title
Lightpanda Browser 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Lightpanda Browser是Lightpanda公司开源的一款无头浏览器。 Lightpanda Browser 0.3.1之前版本存在输入验证错误漏洞，该漏洞源于在计算页面源时在整个URL字符串中搜索@字符而非仅搜索授权组件，可能导致完全绕过同源策略。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
lightpanda-io browser < 0.3.1 -

II. Public POCs for CVE-2026-52842

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7698 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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Trigger conditions & impact
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Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-52842

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Patches & Fixes for CVE-2026-52842 (3)

Vendor Advisories for CVE-2026-52842 (1)

IV. Related Vulnerabilities

Same product: browser
Same vendor: lightpanda-io
Same weakness: CWE-346

V. Comments for CVE-2026-52842

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