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Vulnerability record · CVE-2026-56104 · published 22 June 2026

CVE-2026-56104: Missing authorization vulnerability

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.

8.8 CVSS 4.0 High EPSS 0.42% · top 66.6% CWE-862 · Missing authorization Deferred
8.8CVSS 4.0 base score
0.42%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
14 Jul 2026Last modified by NVD

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.

CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/Chainlit/chainlit/commit/5effb664f1e0af4a4f0a42fe63ea979676039a7f
https://github.com/Chainlit/chainlit/pull/2857
https://github.com/Chainlit/chainlit/releases/tag/2.10.1
https://www.vulncheck.com/advisories/chainlit-session-hijacking-via-websocket-session-restoration

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Source: NIST National Vulnerability Database (record CVE-2026-56104), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.