CVE-2026-53957
- Source
- https://cve.org/CVERecord?id=CVE-2026-53957
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53957.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-53957
- Aliases
- Published
- 2026-09-15T14:34:53Z
- Modified
- 2026-10-28T02:31:09Z
- Severity
-
- 7.7 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N CVSS Calculator
- Summary
- Contentful MCP Server: export_space/import_space tools pass LLM-controlled `host`/`proxy` args to CMA client, redirecting server PAT to attacker-controlled endpoint
- Details
-
Contentful MCP Server is a Model Context Protocol server for the Contentful Management API. Prior to @contentful/mcp-server 1.7.19 and @contentful/mcp-tools 0.4.5, export_space and import_space in packages/mcp-tools/src/tools/jobs/space-to-space-migration/exportSpace.ts and packages/mcp-tools/src/tools/jobs/space-to-space-migration/importSpace.ts expose host, proxy, rawProxy, and insecure network options to LLM-controlled tool arguments and combine those options with the server's CONTENTFUL_MANAGEMENT_TOKEN. After space_to_space_migration_handler enables the migration tools, a direct MCP call or prompt injection through attacker-controlled Contentful content can redirect Contentful Management API requests and their Authorization header to an attacker-controlled host or proxy. The regular tools that use createToolClient are unaffected because those tools pin the host from server configuration. Exposure of the personal access token permits persistent out-of-band access to every Contentful space within the token's scope. This issue is fixed in @contentful/mcp-server 1.7.19 and @contentful/mcp-tools 0.4.5.
- Database specific
{ "cna_assigner": "GitHub_M", "cwe_ids": [ "CWE-918" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53957.json" }- References
-
- https://github.com/contentful/contentful-mcp-server/releases/tag/mcp-server@1.7.19
- https://github.com/contentful/contentful-mcp-server/releases/tag/mcp-tools@0.4.5
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53957.json
- https://github.com/contentful/contentful-mcp-server/security/advisories/GHSA-2xhg-73j7-rrgx
- https://nvd.nist.gov/vuln/detail/CVE-2026-53957
- https://github.com/contentful/contentful-mcp-server/commit/fa7477ee48515f4248bc91a025eab0ca83423fe0
- https://github.com/contentful/contentful-mcp-server/pull/376
Affected packages
Git / github.com/contentful/contentful-mcp-server
Affected ranges
- Type
- GIT
- Repo
- https://github.com/contentful/contentful-mcp-server
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixedFixed
- Database specific
-
Show details
{ "extracted_events": [ { "range": [ { "introduced": "0" }, { "fixed": "1.7.19" } ], "source": "AFFECTED_FIELD", "strategy": "StringRangeExpression" }, { "range": [ { "introduced": "0" }, { "fixed": "0.4.5" } ], "source": "AFFECTED_FIELD", "strategy": "StringRangeExpression" }, { "range": [ { "fixed": "fa7477ee48515f4248bc91a025eab0ca83423fe0" } ], "source": "REFERENCES_COMMIT" }, { "original_tag": "mcp-server@1.7.19", "range": [ { "fixed": "ce904443ae38dfeaeadf305591c95b800e782570" } ], "source": "REFERENCES_TAG" }, { "original_tag": "mcp-tools@0.4.5", "range": [ { "fixed": "ce904443ae38dfeaeadf305591c95b800e782570" } ], "source": "REFERENCES_TAG" } ] }