Figma MCP Server: Unprotected Alternate Channel
CVE-2025-53967 is a high-severity unprotected alternate channel vulnerability in Figma MCP Server from Framelink, with a CVSS 3.1 base score of 8.0 out of 10. It can be exploited from the same local network by an unauthenticated attacker, without any action from a user. The record lists version 0.6.3 as the first without the flaw, so updating Figma MCP Server to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 6.61% chance of exploitation within 30 days, which is in the top 6.04% of all scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Figma MCP Server to 0.6.3 or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Framelink | Figma MCP Server | before 0.6.3 | 0.6.3 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- AdjacentThe attacker must be on the same local network segment.
- Attack complexity
- HighSuccess depends on conditions outside the attacker's control.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- ChangedThe attack can reach beyond the vulnerable component into other systems.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- NoneAvailability is not affected.
Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N. Scored by CNA (mitre.org).
Official description
Framelink Figma MCP Server before 0.6.3 allows an unauthenticated remote attacker to execute arbitrary operating system commands via a crafted HTTP POST request with shell metacharacters in input that is used by a fetchWithRetry curl command. The vulnerable endpoint fails to properly sanitize user-supplied input, enabling the attacker to inject malicious commands that are executed with the privileges of the MCP process. Exploitation requires network access to the MCP interface.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Unprotected Alternate Channel
The product protects a primary channel, but it does not use the same level of protection for an alternate channel.
How developers prevent this class of flaw
- Identify all alternate channels and use the same protection mechanisms that are used for the primary channels.
More Unprotected Alternate Channel vulnerabilities (CWE-420)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: poc, automatable: no, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Patches and release notes
Other references
Other vulnerabilities in Figma MCP Server
- 9.8 Critical severity
Recent Unprotected Alternate Channel vulnerabilities
- 8.8 High severity
- 7.4 High severity
- 9.8 Critical severity
CrushFTP Unprotected Alternate Channel Exploited
- 9.9 Critical severity
- 7.8 High severity
- 8.1 High severity
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