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CVE-2026-56104— Chainlit < 2.10.1 Session Hijacking via WebSocket Session Restoration

Quick assessment

Affected
Chainlit chainlit
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Chainlit是chainlit组织开源的一个大模型对话界面框架。 Chainlit 2.10.1之前版本存在授权问题漏洞，该漏洞源于WebSocket会话恢复过程中缺少所有权验证，可能导致未经身份验证的攻击者通过提供有效的sessionId来恢复和继承已认证的用户会话，进而获得受害者的权限并调用工具和访问数据。

CVSS 8.2 · High EPSS 0.42% · P36

Possible ATT&CK Techniques 1 AI

T1133 · External Remote Services

Affected Version Matrix 1

VendorProduct Version RangeStatus
Chainlit chainlit < 2.10.1 affected
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I. Basic Information for CVE-2026-56104

Vulnerability Information
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Vulnerability Title
Chainlit < 2.10.1 Session Hijacking via WebSocket Session Restoration
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Chainlit 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Chainlit是chainlit组织开源的一个大模型对话界面框架。 Chainlit 2.10.1之前版本存在授权问题漏洞，该漏洞源于WebSocket会话恢复过程中缺少所有权验证，可能导致未经身份验证的攻击者通过提供有效的sessionId来恢复和继承已认证的用户会话，进而获得受害者的权限并调用工具和访问数据。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Chainlit chainlit 0 ~ 2.10.1 -

II. Public POCs for CVE-2026-56104

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Qwen3.6-35B-A3B · 9656 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-56104

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Patches & Fixes for CVE-2026-56104 (2)

Vendor Advisories for CVE-2026-56104 (1)

Vendor Pages for CVE-2026-56104 (1)

IV. Related Vulnerabilities

Same product: chainlit
Same vendor: Chainlit
Same weakness: CWE-862