Auth bypass in Chainlit
CVE-2026-56104
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 ownersh…
Vulnerability class: Broken Access Control
EPSS: 0.003 (17.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N.
Affected products
- Chainlit — versions 0
Weakness classification (CWE)
References
- disclosure@vulncheck.com (release-notes)
- disclosure@vulncheck.com (issue-tracking)
- disclosure@vulncheck.com (patch)
- disclosure@vulncheck.com (third-party-advisory)
Frequently asked questions
- What is CVE-2026-56104?
- CVE-2026-56104 is a high-severity vulnerability in Chainlit, classified under Missing Authorization. CVSS score: 8.2/10. Published 2026-06-22.
- How severe is CVE-2026-56104?
- High severity. CVSS v3 base score is 8.2 out of 10.