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CVE-2026-52843— Lightpanda: fetch() and XMLHttpRequest attach session cookies to cross-origin requests regardless of credentials mode

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 0.2.9之前版本存在输入验证错误漏洞，该漏洞源于fetch()和XMLHttpRequest无条件地将会话Cookie附加到每个HTTP请求，忽略了credentials: omit、credentials: same-origin、credentials: include以及XMLHttpRequest.withCredentials设置，可能导致攻击者控制的来源在Lightpa

CVSS 9.3 · Critical EPSS 0.23% · P13

Affected Version Matrix 1

VendorProduct Version RangeStatus
lightpanda-io browser < 0.2.9 affected
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I. Basic Information for CVE-2026-52843

Vulnerability Information
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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Lightpanda: fetch() and XMLHttpRequest attach session cookies to cross-origin requests regardless of credentials mode
Source: CVE Program / CVE List V5
Vulnerability Description
Lightpanda is a headless browser designed for AI and automation. Prior to 0.2.9, Lightpanda fetch() and XMLHttpRequest unconditionally attached session cookies to every HTTP request, ignoring credentials: omit, credentials: same-origin, credentials: include, and XMLHttpRequest.withCredentials, allowing an attacker-controlled origin in a Lightpanda session to issue authenticated cross-origin requests against a victim origin. This issue is fixed in version 0.2.9.
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 0.2.9之前版本存在输入验证错误漏洞，该漏洞源于fetch()和XMLHttpRequest无条件地将会话Cookie附加到每个HTTP请求，忽略了credentials: omit、credentials: same-origin、credentials: include以及XMLHttpRequest.withCredentials设置，可能导致攻击者控制的来源在Lightpa
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 < 0.2.9 -

II. Public POCs for CVE-2026-52843

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 10099 chars
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III. Intelligence Information for CVE-2026-52843

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Patches & Fixes for CVE-2026-52843 (2)

Vendor Advisories for CVE-2026-52843 (1)

Vendor Pages for CVE-2026-52843 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-52843

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