GitHub Advisoryadvisory · PyPI

GHSA-c39v-8hrw-h448 Chainlit contains a session hijacking vulnerability

CRITICAL Published 2026-06-22 Modified 2026-09-21 Official page ↗
Aliases
CVE-2026-56104
Ecosystem
PyPI
Packages
chainlit
Severity
Critical
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Weaknesses
CWE-862
Reviewed
2026-09-21

Affected packages

• PyPI chainlit: < 2.10.1 → fixed in 2.10.1

Description

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.

Related

Alias · CVE (1)

  • CVE-2026-56104 Chainlit before 2.10.1 contains a session hijacking vulnerability that allows unauthenticated attackers to restore and inherit… vulnerability

Weakness · CWE (1)

  • CWE-862 Missing Authorization weakness

References