CVE-2026-53957

See a problem?
Please try reporting it to the source first.
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
2026-09-18T03:30:59Z
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

Affected packages

Git / github.com/contentful/contentful-mcp-server

Affected ranges

Type
GIT
Repo
https://github.com/contentful/contentful-mcp-server
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
fa7477ee48515f4248bc91a025eab0ca83423fe0
Fixed
ce904443ae38dfeaeadf305591c95b800e782570
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "1.7.19"
        },
        {
            "fixed": "0.4.5"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

mcp-server@1.*
mcp-server@1.7.0
mcp-server@1.7.1
mcp-server@1.7.10
mcp-server@1.7.11
mcp-server@1.7.12
mcp-server@1.7.13
mcp-server@1.7.14
mcp-server@1.7.15
mcp-server@1.7.16
mcp-server@1.7.17
mcp-server@1.7.18
mcp-server@1.7.2
mcp-server@1.7.3
mcp-server@1.7.4
mcp-server@1.7.5
mcp-server@1.7.6
mcp-server@1.7.7
mcp-server@1.7.8
mcp-server@1.7.9
mcp-tools@0.*
mcp-tools@0.1.0
mcp-tools@0.1.1
mcp-tools@0.1.2
mcp-tools@0.2.0
mcp-tools@0.2.1
mcp-tools@0.2.2
mcp-tools@0.2.3
mcp-tools@0.2.4
mcp-tools@0.2.5
mcp-tools@0.2.6
mcp-tools@0.3.0
mcp-tools@0.3.1
mcp-tools@0.3.2
mcp-tools@0.4.0
mcp-tools@0.4.1
mcp-tools@0.4.2
mcp-tools@0.4.3
mcp-tools@0.4.4
v1.*
v1.0.1
v1.0.2
v1.0.3
v1.0.4
v1.0.5
v1.1.0
v1.2.0
v1.2.1
v1.2.2
v1.3.0
v1.4.0
v1.5.0
v1.6.0
v1.6.1
v1.6.2

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53957.json"