GitHub Kanban MCP Server vulnerable to Command Injection

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

8.9 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X · score source

EPSS

• CVE-2025-53818: 1.38% estimated exploitation activity in the next 30 days; percentile 72.15 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

The MCP Server at https://github.com/Sunwood-ai-labs/github-kanban-mcp-server/ is written in a way that is vulnerable to command injection vulnerability attacks as part of some of its MCP Server tool definition and implementation. Vulnerable tool The MCP Server exposes the tool addcomment which relies on Node.js child process API exec to execute the GitHub (gh) command, is an unsafe and vulnerable API if concatenated with untrusted user input. Data flows from the tool definition here which takes in args.issuenumber and calls handleAddComment() in this definitino that uses exec in an insecure way. Vulnerable line of code: https://github.com/Sunwood-ai-labs/github-kanban-mcp-server/blob/main/src/handlers/comment-handlers.ts#L8-L23 Exploitation Proof of Concept When LLMs are tricked through prompt injection (and other techniques and attack vectors) to call the tool with input that uses special shell characters such as ; rm -rf /tmp;

(be careful actually executing this payload) and…

Published by the source

15 Jul 2025, 17:06 UTC

Last modified by the source

15 Jul 2025, 17:42 UTC

Source last checked

26 Oct 2026, 12:37 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-6jx8-rcjx-vmwf

2. Revision 2 · amended · 24 Oct 2026

   Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

3. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-6jx8-rcjx-vmwf

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# Patch Next advisory brief: CVE-2025-53818

Advisory: GitHub Kanban MCP Server vulnerable to Command Injection
IDs: CVE-2025-53818, GHSA-6jx8-rcjx-vmwf
Record: https://patchnext.com/advisories/cve-2025-53818 (revision 3, source checked 26 Oct 2026, 12:37 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.9)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @sunwood-ai-labs/github-kanban-mcp-server: affected <= 0.3.0

## Suggested inspection (read-only)
- `npm ls @sunwood-ai-labs/github-kanban-mcp-server --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on @sunwood-ai-labs/github-kanban-mcp-server.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-6jx8-rcjx-vmwf (OSV record GHSA-6jx8-rcjx-vmwf lists affected ranges: npm @sunwood-ai-labs/github-kanban-mcp-server >=0 <=0.3.0)
- Verified: https://github.com/advisories/GHSA-6jx8-rcjx-vmwf (GitHub-reviewed advisory GHSA-6jx8-rcjx-vmwf lists affected ranges: npm @sunwood-ai-labs/github-kanban-mcp-server >=0 <=0.3.0)

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