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CVE

CVE-2026-52843

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

CVE-2026-52843

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

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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.3
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
C
H
U
-

Related Resources

No items found.

References

https://github.com/lightpanda-io/browser/releases/tag/0.2.9, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52843.json, https://github.com/lightpanda-io/browser/security/advisories/GHSA-36mm-v3c2-24cc, https://nvd.nist.gov/vuln/detail/CVE-2026-52843, https://github.com/lightpanda-io/browser/commit/2cdaac780bed65db98bbb6ed2ad5bc6011863c76, https://github.com/lightpanda-io/browser/pull/2155

Severity

9.3

CVSS Score
0
10

Basic Information

Base CVSS
9.3
EPSS Probability
0.00234%
EPSS Percentile
0.14169%
Introduced Version
0
Fix Available
b2b1302fa2638bcc295c6ad0d9a71bf9aa75adb1

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