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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-56104 Detail

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.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

Nist CVSS score does not match with CNA score
CNA:  VulnCheck
CVSS-B 8.8 HIGH
Vector:  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

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://github.com/Chainlit/chainlit/commit/5effb664f1e0af4a4f0a42fe63ea979676039a7f VulnCheck
https://github.com/Chainlit/chainlit/pull/2857 VulnCheck
https://github.com/Chainlit/chainlit/releases/tag/2.10.1 VulnCheck
https://www.vulncheck.com/advisories/chainlit-session-hijacking-via-websocket-session-restoration VulnCheck

Weakness Enumeration

CWE-ID CWE Name Source
CWE-862 Missing Authorization VulnCheck  

Change History

4 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-56104
NVD Published Date:
06/22/2026
NVD Last Modified:
07/14/2026
Source:
VulnCheck