CVE WatchNov 2, 2026

CVE-2026-120492

Chainlit 2.12.0 contains a server-side request forgery vulnerability that allows unauthenticated attackers to bypass path-scoped MCP allowed

CVSS

5.4

Medium

EPSS

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KEV

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Exploit Today

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0-100

Published: Nov 2, 2026 · Last modified: Nov 2, 2026 · CWE-918

EPSS · 30d

Not enough EPSS history yet.

Technical 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.

Official references

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