CVE-2026-52843

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.

Score

CVSS 3.1 9.3 Critical

Status

Deferred - security-advisories@github.com

Published

2026-07-15

Last modified

2026-10-24

Weaknesses

CWE-346

Affected products

• Browser (Lightpanda-io)

References

• https://github.com/lightpanda-io/browser/security/advisories/GHSA-36mm-v3c2-24cc
• https://github.com/lightpanda-io/browser/pull/2155
• https://github.com/lightpanda-io/browser/commit/2cdaac780bed65db98bbb6ed2ad5bc6011863c76
• https://github.com/lightpanda-io/browser/releases/tag/0.2.9