CVE-2026-56104
Chainlit before 2.10.1 contains a session hijacking vulnerability that allows unauthenticated attackers to restore and inherit authenticated
CVSS
8.2
High
EPSS
0.3%
p17
KEV
—
Exploit Today
5
0-100
Published: Jun 22, 2026 · Last modified: Jul 14, 2026 · CWE-862
0.3%EPSS · 30 days0.3%
2026-06-302026-07-20
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.
- github.comhttps://github.com/Chainlit/chainlit/commit/5effb664f1e0af4a4f0a42fe63ea979676039a7f
- github.comhttps://github.com/Chainlit/chainlit/pull/2857
- github.comhttps://github.com/Chainlit/chainlit/releases/tag/2.10.1
- www.vulncheck.comhttps://www.vulncheck.com/advisories/chainlit-session-hijacking-via-websocket-session-restoration
CVECVSSEPSSKEVRExploitTitleMod.
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