MEDIUMCVSS v3.1 5.4Vulnerability
CVE-2026-120492
Chainlit 2.12.0 contains a server-side request forgery vulnerability that allows unauthenticated attackers to bypass path-scoped MCP allowed_urls entries because validate_mcp_url does not reject the semicolon character. Attackers can submit MCP URLs with '..;' segments to the /mcp endpoint, causing requests to paths outside the operator's grant on origins that strip semicolon path parameters.
Properties
- Severity
- MEDIUM
- Nvd fetched at
- 2026-11-02T16:55:11.069321+00:00
- Cvss severity
- MEDIUM
- Cvss score
- 5.4
- Retrieved at
- 2026-11-02T16:56:00+00:00
- Score
- 5.4
- Cvss version
- 3.1
- Last source
- NVD
- Cve id
- CVE-2026-120492
- Cvss vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
- First seen by Signal
- 2026-11-02T16:50:29+00:00
- Vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
- Published at
- 2026-11-02T15:17:31.210
- Last modified
- 2026-11-02T15:17:31.360
Related Entities (1)
HAS_WEAKNESS (1)
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