Quick answers
- Is CVE-2026-100868 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-100868 being exploited in the wild.
- How severe is CVE-2026-100868?
- Medium severity, with a CVSS score of 6.3, published 27 September 2026.
- Which products and versions are affected?
- Penpot before 2.18.0.
- Is there a fix for CVE-2026-100868?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-100868 attacked?
- It is attacked from the adjacent network, in a web application.
- Am I affected by CVE-2026-100868?
- Check whether you run Penpot at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The MCP server plugin WebSocket bridge lacks authentication and listens on all network interfaces in single-user mode, allowing unauthenticated adjacent network access. An attacker can connect to the WebSocket port to spoof the Penpot browser plugin, intercept task payloads between the client and plugin, and return malicious forged results. The vulnerability requires no user interaction and affects versions before 2.18.0.
Affected products
- Penpot Penpot before 2.18.0
Timeline
- 2026-09-27: disclosed