What is CVE-2026-44429?

CVE-2026-44429 is a medium-severity vulnerability in Lfprojects Mcp_registry, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-05-14.

How severe is CVE-2026-44429?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Lfprojects Mcp_registry

CVE-2026-44429

The MCP Registry provides MCP clients with a list of MCP servers, like an app store for MCP servers. Prior to 1.7.7, the public catalogue UI served at GET / (file internal/api/handlers/v0/ui_index.html) is vulnerable to stored cross-site s…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.000 (10.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

Affected products

Lfprojects Mcp_registry
Modelcontextprotocol Registry — versions < 1.7.7

Weakness classification (CWE)

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2026-44429?: CVE-2026-44429 is a medium-severity vulnerability in Lfprojects Mcp_registry, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-05-14.
How severe is CVE-2026-44429?: Medium severity. CVSS v3 base score is 5.4 out of 10.