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,...

CVE-2026-52843

What is affected: Lightpanda’s headless browser. Issue: Prior to 0.2.9, fetch() and XMLHttpRequest unconditionally attached session cookies to every HTTP request, ignoring credentials mode (omit, same-origin, include) and XMLHttpRequest.withCredentials. Impact: An attacker-controlled origin in a ...