CVEvulnerability
CVE-2026-56104
8.8 HIGH
Official page ↗
- Status
- Deferred
- Published
- 2026-06-22
- Last modified
- 2026-10-08
- Assigner
- [email protected]
- CVSS 4.0 ([email protected])
- 8.8 HIGH — CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- CVSS 3.1 ([email protected])
- 8.2 HIGH — CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
- Weaknesses
- CWE-862
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.
Related
Weakness · CWE (1)
- CWE-862 Missing Authorization weakness
References
- https://github.com/Chainlit/chainlit/commit/5effb664f1e0af4a4f0a42fe63ea979676039a7f github.com
- https://github.com/Chainlit/chainlit/pull/2857 github.com
- https://github.com/Chainlit/chainlit/releases/tag/2.10.1 github.com
- https://www.vulncheck.com/advisories/chainlit-session-hijacking-via-websocket-session-restoration www.vulncheck.com