Vulnerability Description
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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/Chainlit/chainlit/commit/5effb664f1e0af4a4f0a42fe63ea97967603
- https://github.com/Chainlit/chainlit/pull/2857
- https://github.com/Chainlit/chainlit/releases/tag/2.10.1
- https://www.vulncheck.com/advisories/chainlit-session-hijacking-via-websocket-se
FAQ
What is CVE-2026-56104?
CVE-2026-56104 is a vulnerability with a CVSS score of 8.2 (HIGH). 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 WebSoc...
How severe is CVE-2026-56104?
CVE-2026-56104 has been rated HIGH with a CVSS base score of 8.2/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-56104?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.