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GHSA-c39v-8hrw-h448

Chainlit contains a session hijacking vulnerability

Source: GitHub Advisory Database (reviewed) Critical CVE-2026-56104

Packages

EcosystemPackageAffectedFixed in
PyPI chainlit < 2.10.1 2.10.1

Details

As written in the advisory (Markdown source, shown as plain text).

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

External links from the advisory. They lead to third-party sites.