CVE-2026-56104 — Chainlit < 2.10.1 Session Hijacking via WebSocket Session Restoration
Chainlit before 2.10.1 contains a session hijacking vulnerability that allows unauthenticated attackers to restore and inherit authenticated user sessions by presenting a valid …
Published: 2026-06-22 · CVSS: 8.8 · CVSS 4.0
Chainlit before 2.10.1 contains a session hijacking vulnerability that allows unauthenticated attackers to restore and inherit authenticated user sessions by presenting a valid sessionId during WebSocket session restoration without ownership verification. Attackers can exploit the restore_existing_session path to assume a victim's permissions and roles, enabling unauthorized invocation of tools and access to data restricted to the authenticated victim.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7