CVE-2026-56104
High · 8.2CVSS
8.2
EPSS
0.4%
Published
Jun 22, 2026
CISA due date
—
The record
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 | Introduced | Fixed |
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