AI and data stack advisories

Severe, 6 weeks1496Projects326

1496 severe, 6 weeks · 326 projects

chainlitGHSA-c39v-8hrw-h448

Chainlit contains a session hijacking vulnerability

chainlit

CVE-2026-56104 · Published Jun 22, 2026 · updated Oct 1, 2026

Critical7.4
Fix: upgrade to 2.10.1 or later
GitHub advisory

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 versions

PackageAffectedFixed in
chainlit
PyPI
< 2.10.12.10.1
Details and references

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