CVE-2026-56104Chainlit < 2.10.1 Session Hijacking via WebSocket Session Restoration
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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
- 8.2 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
- Weakness (CWE)
- CWE-862
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Deferred
- Record last updated
- Oct 8, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Chainlit chainlit chainlit:chainlit (from the name) | before 2.10.1 | CNA record |
References
- https://github.com/Chainlit/chainlit/releases/tag/2.10.1release-notes
- https://github.com/Chainlit/chainlit/pull/2857issue-tracking
- https://github.com/Chainlit/chainlit/commit/5effb664f1e0af4a4f0a42fe63ea979676039a7fpatch
- https://www.vulncheck.com/advisories/chainlit-session-hijacking-via-websocket-session-restorationthird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.