CVE-2026-45805: Penpot: MCP REPL server binds to 0.0.0.0 with unauthenticated /execute endpoint — RCE

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-15 · updated 2026-07-15
Weakness: CWE-749

Description

Penpot is an open-source design tool for design and code collaboration. Prior to 2.15.0, Penpot MCP's mcp/packages/server/src/ReplServer.ts bound the ReplServer to 0.0.0.0:4403 and exposed an unauthenticated /execute endpoint that passed the code field to PluginBridge.executePluginTask(), allowing anyone on the network to execute JavaScript on the server. This issue is fixed in version 2.15.0.

Affected products

penpot: before 2.15.0

References

https://github.com/penpot/penpot/commit/798ee46b4a84ee6dfc756b001f33acbe0280d62f
https://github.com/penpot/penpot/issues/9518
https://github.com/penpot/penpot/releases/tag/2.15.0
https://github.com/penpot/penpot/security/advisories/GHSA-22qr-rp27-j9wm
https://github.com/penpot/penpot/security/advisories/GHSA-22qr-rp27-j9wm

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