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.
CVSS Score
CRITICAL
Related Weaknesses (CWE)
References
- https://github.com/lightpanda-io/browser/commit/2cdaac780bed65db98bbb6ed2ad5bc60
- https://github.com/lightpanda-io/browser/pull/2155
- https://github.com/lightpanda-io/browser/releases/tag/0.2.9
- https://github.com/lightpanda-io/browser/security/advisories/GHSA-36mm-v3c2-24cc
FAQ
What is CVE-2026-52843?
CVE-2026-52843 is a vulnerability with a CVSS score of 9.3 (CRITICAL). 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 credenti...
How severe is CVE-2026-52843?
CVE-2026-52843 has been rated CRITICAL with a CVSS base score of 9.3/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-52843?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.