critical7.4
CVE-2026-56104
Chainlit before 2.10.1 contains a session hijacking vulnerability that allows unauthenticated attackers to restore and inherit authenticated user sessions by p…
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | chainlit | < 2.10.1 | 2.10.1 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-c39v-8hrw-h448
- https://nvd.nist.gov/vuln/detail/CVE-2026-56104
- https://github.com/Chainlit/chainlit/pull/2857
- https://github.com/Chainlit/chainlit/commit/5effb664f1e0af4a4f0a42fe63ea979676039a7f
- https://github.com/Chainlit/chainlit/releases/tag/2.10.1
- https://www.vulncheck.com/advisories/chainlit-session-hijacking-via-websocket-session-restoration