CVE-2026-100868Penpot before 2.18.0 Unauthenticated WebSocket Access via MCP Bridge
Updated under an hour ago ()
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It affects penpot and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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Free account, 1 product
Penpot before 2.18.0 binds the MCP server plugin WebSocket bridge to all network interfaces without authentication in single-user mode. Unauthenticated attackers on adjacent networks can connect to the WebSocket port to impersonate the Penpot browser plugin, intercept task payloads, and return forged results to the MCP client.
- CVSS
- 6.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
- Weakness (CWE)
- CWE-1327
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Deferred
- Record last updated
- Oct 8, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
penpot penpot penpot:penpot (from the name) | before 2.18.0 | CNA record |
penpot @penpot/mcp penpot:mcp (from the name) | through 2.15.4 | CNA record |
References
- https://github.com/penpot/penpot/security/advisories/GHSA-ch2q-6x56-qg5rvendor-advisory
- https://github.com/penpot/penpot/commit/b5274a44766d095247037be18c1d1918ac67ddebpatch
- https://github.com/penpot/penpot/blob/1d2c37e52c733f74017d90b0fd1ae2d074a5c33d/mcp/packages/server/src/PluginBridge.ts#L52technical-description
- https://github.com/penpot/penpot/security/advisories/GHSA-22qr-rp27-j9wmrelated, vendor-advisory
- https://github.com/penpot/penpotproduct
- https://www.vulncheck.com/advisories/penpot-before-2.18.0-unauthenticated-websocket-access-via-mcp-bridgethird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.