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.
Metrics
Affected Vendors & Products
References
History
Sat, 07 Nov 2026 19:30:00 +0000
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ssvc
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Mon, 02 Nov 2026 14:30:00 +0000
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| Description | 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. | |
| Title | Chainlit 2.12.0 SSRF via Semicolon Path Segment in MCP allowed_urls | |
| First Time appeared |
Chainlit
Chainlit chainlit |
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| Weaknesses | CWE-918 | |
| CPEs | cpe:2.3:a:chainlit:chainlit:2.12.0:*:*:*:*:*:*:* | |
| Vendors & Products |
Chainlit
Chainlit chainlit |
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| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: VulnCheck
Published: 2026-11-02T14:29:20.711Z
Updated: 2026-11-07T00:22:59.156Z
Reserved: 2026-11-02T14:15:21.510Z
Link: CVE-2026-120492
Updated: 2026-11-07T00:22:51.951Z
Status : Deferred
Published: 2026-11-02T15:17:31.210
Modified: 2026-11-07T01:17:02.410
Link: CVE-2026-120492
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