CVE-2026-56104: Chainlit contains a session hijacking vulnerability
(updated )
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.
References
- github.com/Chainlit/chainlit/commit/5effb664f1e0af4a4f0a42fe63ea979676039a7f
- github.com/Chainlit/chainlit/pull/2857
- github.com/Chainlit/chainlit/releases/tag/2.10.1
- github.com/advisories/GHSA-c39v-8hrw-h448
- nvd.nist.gov/vuln/detail/CVE-2026-56104
- www.vulncheck.com/advisories/chainlit-session-hijacking-via-websocket-session-restoration
Code Behaviors & Features
Detect and mitigate CVE-2026-56104 with GitLab Dependency Scanning
Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Dependency Scanning using SBOM also detects vulnerabilities from proprietary advisories that this site does not include. Learn more about Dependency Scanning using SBOM →