CVE-2026-120492VulnerabilityPublished
Chainlit 2.12.0 SSRF via Semicolon Path Segment in MCP allowed_urls
A 0-10 score for how bad the bug is in the worst case. It does not say how common the affected setup is.What do these mean? →6.3MediumCNA
- Exploited
- No known exploitation
- Fix
- No fix listed
- Who is exposed
- Not reported
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- Published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 28/100 · provisional
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
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.
Timeline
- CVE published
- First seen by cve.now
Affected versions
- Chainlit Chainlit
2.12.0
Evidence 4
- Advisory
- Repository
- Repository
- Link
Corrections
None so far.
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