Vulnerability in Lightpanda-io Browser

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, cr…

CVSS v3 metric

CVSS v3 base score 9.3 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-52843?
CVE-2026-52843 is a critical-severity vulnerability in Lightpanda-io Browser, classified under Origin Validation Error. CVSS score: 9.3/10. Published 2026-07-15.
How severe is CVE-2026-52843?
Critical severity. CVSS v3 base score is 9.3 out of 10.