Common Weakness Enumeration

CWE-918

Allowed

Server-Side Request Forgery (SSRF)

Abstraction: Base · Status: Incomplete

API response cwe.mitre.org

The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.

4834 vulnerabilities reference this CWE, most recent first.

GHSA-4FF6-858J-R822

Vulnerability from github – Published: 2025-01-16 23:08 – Updated: 2025-01-17 15:41
VLAI
Summary
Gomatrixserverlib Server-Side Request Forgery (SSRF) on redirects and federation
Details

Impact

Gomatrixserverlib is vulnerable to server-side request forgery, serving content from a private network it can access, under certain conditions.

Patches

c4f1e01eab0dd435709ad15463ed38a079ad6128 fixes this issue.

Workarounds

Use a local firewall to limit the network segments and hosts the service using gomatrixserverlib can access.

References

N/A

Severity
4.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Show details on source website
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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 0.0.0-20250106190028-bf86bc98b879"
      },
      "package": {
        "ecosystem": "Go",
        "name": "github.com/matrix-org/gomatrixserverlib"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.0.0-20250116181547-c4f1e01eab0d"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2024-52594"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-918"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-01-16T23:08:32Z",
    "nvd_published_at": "2025-01-16T19:15:28Z",
    "severity": "MODERATE"
  },
  "details": "### Impact\nGomatrixserverlib is vulnerable to server-side request forgery, serving content from a private network it can access, under certain conditions.\n\n### Patches\n\nc4f1e01eab0dd435709ad15463ed38a079ad6128 fixes this issue.\n\n\n### Workarounds\nUse a local firewall to limit the network segments and hosts the service using gomatrixserverlib can access.\n\n### References\nN/A\n",
  "id": "GHSA-4ff6-858j-r822",
  "modified": "2025-01-17T15:41:23Z",
  "published": "2025-01-16T23:08:32Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/matrix-org/gomatrixserverlib/security/advisories/GHSA-4ff6-858j-r822"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-52594"
    },
    {
      "type": "WEB",
      "url": "https://github.com/matrix-org/gomatrixserverlib/commit/c4f1e01eab0dd435709ad15463ed38a079ad6128"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/matrix-org/gomatrixserverlib"
    },
    {
      "type": "WEB",
      "url": "https://pkg.go.dev/vuln/GO-2025-3396"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Gomatrixserverlib Server-Side Request Forgery (SSRF) on redirects and federation"
}

GHSA-4FG7-F244-3J49

Vulnerability from github – Published: 2026-05-19 14:44 – Updated: 2026-06-09 11:56
VLAI
Summary
HAX open-apis: Credential Theft via Server-Side Request Forgery (SSRF) in open-apis
Details

Summary

Multiple functions conduct substring-only matching to validate hostnames to which basic authorization should be sent. An attacker can append the matched substrings to an attacker-controlled endpoint and capture authentication.

Details

api/services/website/cacheAddress.js, api/apps/haxcms/lib/JOSHelpers.js, and api/apps/haxcms/convert/elmslnToSite.js use similar logic to check for hard-coded site names. However, the logic only looks for the substring to be included in the user-controlled string, allowing an attacker to craft an API call and extract the credentials intended for the hard-coded domains.

PoC

Making API calls to an affected endpoint will result in credential theft. The attacker-controlled domains in these proofs of concept are cloudflared tunnels, protecting the production credentials from unencrypted exposure.

cacheAddress.js: ssrf_cred_theft

elmslnToSite.js: theft2

JOSHelpers.js: theft3

Impact

This vulnerability allows internal data, including secrets, to be exfiltrated to an attacker-controlled domain. Credentials were confirmed with the maintainer to grant access to unreleased LMS content on subsequent systems; out of scope for PoC.

Severity
8.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:L/SI:N/SA:N
Show details on source website
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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "@haxtheweb/open-apis"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "26.0.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-46391"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-183",
      "CWE-918"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-19T14:44:46Z",
    "nvd_published_at": "2026-06-05T19:16:33Z",
    "severity": "HIGH"
  },
  "details": "### Summary\nMultiple functions conduct substring-only matching to validate hostnames to which basic authorization should be sent. An attacker can append the matched substrings to an attacker-controlled endpoint and capture authentication.\n\n### Details\n[api/services/website/cacheAddress.js](https://github.com/haxtheweb/open-apis/blob/ff694ce91442c39ae1a78dc21e9ce50546aa207a/api/services/website/cacheAddress.js#L21), [api/apps/haxcms/lib/JOSHelpers.js](https://github.com/haxtheweb/open-apis/blob/ff694ce91442c39ae1a78dc21e9ce50546aa207a/api/apps/haxcms/lib/JOSHelpers.js#L26), and [api/apps/haxcms/convert/elmslnToSite.js](https://github.com/haxtheweb/open-apis/blob/ff694ce91442c39ae1a78dc21e9ce50546aa207a/api/apps/haxcms/convert/elmslnToSite.js#L37) use similar logic to check for hard-coded site names. However, the logic only looks for the substring to be included in the user-controlled string, allowing an attacker to craft an API call and extract the credentials intended for the hard-coded domains.\n\n### PoC\nMaking API calls to an affected endpoint will result in credential theft. The attacker-controlled domains in these proofs of concept are `cloudflared` tunnels, protecting the production credentials from unencrypted exposure.\n\ncacheAddress.js:\n\u003cimg width=\"3404\" height=\"1656\" alt=\"ssrf_cred_theft\" src=\"https://github.com/user-attachments/assets/0a87cef5-3c4d-450a-8bb7-35123d5f621b\" /\u003e\n\nelmslnToSite.js:\n\u003cimg width=\"3409\" height=\"1641\" alt=\"theft2\" src=\"https://github.com/user-attachments/assets/bede82cc-a613-4fc7-bbf6-76166af784f5\" /\u003e\n\nJOSHelpers.js:\n\u003cimg width=\"3407\" height=\"1597\" alt=\"theft3\" src=\"https://github.com/user-attachments/assets/4f3f8bee-443e-4b22-9d41-eb9726619d36\" /\u003e\n\n### Impact\nThis vulnerability allows internal data, including secrets, to be exfiltrated to an attacker-controlled domain. Credentials were confirmed with the maintainer to grant access to unreleased LMS content on subsequent systems; out of scope for PoC.",
  "id": "GHSA-4fg7-f244-3j49",
  "modified": "2026-06-09T11:56:37Z",
  "published": "2026-05-19T14:44:46Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/haxtheweb/issues/security/advisories/GHSA-4fg7-f244-3j49"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46391"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/haxtheweb/issues"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:L/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "HAX open-apis: Credential Theft via Server-Side Request Forgery (SSRF) in open-apis"
}

GHSA-4FG9-5W46-XMRJ

Vulnerability from github – Published: 2023-09-06 15:30 – Updated: 2023-09-08 12:18
VLAI
Summary
Apache Superset Server Side Request Forgery vulnerability
Details

Improper REST API permission in Apache Superset up to and including 2.1.0 allows for an authenticated Gamma users to test network connections, possible SSRF.

Severity
4.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Show details on source website
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "apache-superset"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "2.1.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2023-36388"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-918"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2023-09-08T12:18:25Z",
    "nvd_published_at": "2023-09-06T13:15:08Z",
    "severity": "MODERATE"
  },
  "details": "Improper REST API permission in Apache Superset up to and including 2.1.0 allows for an authenticated Gamma users to test network connections, possible SSRF.\n\n",
  "id": "GHSA-4fg9-5w46-xmrj",
  "modified": "2023-09-08T12:18:25Z",
  "published": "2023-09-06T15:30:26Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-36388"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/apache/superset"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread/ccmjjz4jp17yc2kcd18qshmdtf7qorfs"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Apache Superset Server Side Request Forgery vulnerability"
}

GHSA-4FV2-MMC2-3P6X

Vulnerability from github – Published: 2026-04-25 12:32 – Updated: 2026-04-25 12:32
VLAI
Details

A flaw has been found in devlikeapro WAHA up to 2026.3.4. This affects an unknown function of the file src/api/media.controller.ts of the component API Request Handler. This manipulation causes server-side request forgery. The attack can be initiated remotely. The exploit has been published and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Severity
6.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
2.1 (Low)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
Show details on source website
To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2026-6979"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-918"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-25T12:15:59Z",
    "severity": "MODERATE"
  },
  "details": "A flaw has been found in devlikeapro WAHA up to 2026.3.4. This affects an unknown function of the file src/api/media.controller.ts of the component API Request Handler. This manipulation causes server-side request forgery. The attack can be initiated remotely. The exploit has been published and may be used. The vendor was contacted early about this disclosure but did not respond in any way.",
  "id": "GHSA-4fv2-mmc2-3p6x",
  "modified": "2026-04-25T12:32:05Z",
  "published": "2026-04-25T12:32:05Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-6979"
    },
    {
      "type": "WEB",
      "url": "https://github.com/wing3e/public_exp/issues/36"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/submit/795416"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/vuln/359522"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/vuln/359522/cti"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/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",
      "type": "CVSS_V4"
    }
  ]
}

GHSA-4FWH-VHV3-7XX7

Vulnerability from github – Published: 2024-01-13 03:30 – Updated: 2024-01-24 18:30
VLAI
Details

An issue in rymcu forest v.0.02 allows a remote attacker to obtain sensitive information via manipulation of the HTTP body URL in the com.rymcu.forest.web.api.common.UploadController file.

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Show details on source website
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{
  "affected": [],
  "aliases": [
    "CVE-2023-51804"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-918"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-01-13T02:15:07Z",
    "severity": "HIGH"
  },
  "details": "An issue in rymcu forest v.0.02 allows a remote attacker to obtain sensitive information via manipulation of the HTTP body URL in the com.rymcu.forest.web.api.common.UploadController file.",
  "id": "GHSA-4fwh-vhv3-7xx7",
  "modified": "2024-01-24T18:30:59Z",
  "published": "2024-01-13T03:30:17Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-51804"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rymcu/forest/issues/149"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-4G3W-2657-GJQ5

Vulnerability from github – Published: 2025-04-14 03:30 – Updated: 2025-04-14 03:30
VLAI
Details

SmartRobot from INTUMIT has a Server-Side Request Forgery vulnerability, allowing unauthenticated remote attackers to probe internal network and even access arbitrary local files on the server.

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Show details on source website
To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2025-3572"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-918"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-04-14T03:15:17Z",
    "severity": "HIGH"
  },
  "details": "SmartRobot from INTUMIT has a Server-Side Request Forgery vulnerability, allowing unauthenticated remote attackers to probe internal network and even access arbitrary local files on the server.",
  "id": "GHSA-4g3w-2657-gjq5",
  "modified": "2025-04-14T03:30:34Z",
  "published": "2025-04-14T03:30:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-3572"
    },
    {
      "type": "WEB",
      "url": "https://www.twcert.org.tw/en/cp-139-10065-2494c-2.html"
    },
    {
      "type": "WEB",
      "url": "https://www.twcert.org.tw/tw/cp-132-10064-6346a-1.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-4G5W-3WHP-5G88

Vulnerability from github – Published: 2025-04-24 18:31 – Updated: 2026-04-01 18:34
VLAI
Details

Server-Side Request Forgery (SSRF) vulnerability in Ankur Vishwakarma WP AVCL Automation Helper (formerly WPFlyLeads) allows Server Side Request Forgery. This issue affects WP AVCL Automation Helper (formerly WPFlyLeads): from n/a through 3.4.

Severity
4.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N
Show details on source website
To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2025-46531"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-918"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-04-24T16:15:44Z",
    "severity": "MODERATE"
  },
  "details": "Server-Side Request Forgery (SSRF) vulnerability in Ankur Vishwakarma WP AVCL Automation Helper (formerly WPFlyLeads) allows Server Side Request Forgery. This issue affects WP AVCL Automation Helper (formerly WPFlyLeads): from n/a through 3.4.",
  "id": "GHSA-4g5w-3whp-5g88",
  "modified": "2026-04-01T18:34:59Z",
  "published": "2025-04-24T18:31:08Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-46531"
    },
    {
      "type": "WEB",
      "url": "https://patchstack.com/database/wordpress/plugin/woozap/vulnerability/wordpress-wp-avcl-automation-helper-formerly-wpflyleads-3-4-server-side-request-forgery-ssrf-vulnerability?_s_id=cve"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-4G6X-74C2-RFR9

Vulnerability from github – Published: 2025-12-30 21:30 – Updated: 2025-12-30 21:30
VLAI
Details

A vulnerability was determined in FeehiCMS up to 2.1.1. Impacted is an unknown function of the file frontend/web/timthumb.php of the component TimThumb. Executing manipulation of the argument src can lead to server-side request forgery. The attack can be launched remotely. The exploit has been publicly disclosed and may be utilized. The vendor was contacted early about this disclosure but did not respond in any way.

Severity
7.3 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
5.5 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
Show details on source website
To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2025-15264"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-918"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-12-30T19:15:44Z",
    "severity": "MODERATE"
  },
  "details": "A vulnerability was determined in FeehiCMS up to 2.1.1. Impacted is an unknown function of the file frontend/web/timthumb.php of the component TimThumb. Executing manipulation of the argument src can lead to server-side request forgery. The attack can be launched remotely. The exploit has been publicly disclosed and may be utilized. The vendor was contacted early about this disclosure but did not respond in any way.",
  "id": "GHSA-4g6x-74c2-rfr9",
  "modified": "2025-12-30T21:30:32Z",
  "published": "2025-12-30T21:30:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-15264"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/?ctiid.338663"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/?id.338663"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/?submit.718278"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/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",
      "type": "CVSS_V4"
    }
  ]
}

GHSA-4GG8-4J5V-PVFM

Vulnerability from github – Published: 2025-08-18 18:30 – Updated: 2025-08-18 18:30
VLAI
Details

ColdFusion versions 2025.1, 2023.13, 2021.19 and earlier are affected by a Server-Side Request Forgery (SSRF) vulnerability that could lead to limited file system read. A high-privilege authenticated attacker can force the application to make arbitrary requests via injection of arbitrary URLs. Exploitation of this issue does not require user interaction.

Severity
2.2 (Low)
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:N
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{
  "affected": [],
  "aliases": [
    "CVE-2025-54234"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-918"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-08-18T17:15:29Z",
    "severity": "LOW"
  },
  "details": "ColdFusion versions 2025.1, 2023.13, 2021.19 and earlier are affected by a Server-Side Request Forgery (SSRF) vulnerability that could lead to limited file system read. A high-privilege authenticated attacker can force the application to make arbitrary requests via injection of arbitrary URLs. Exploitation of this issue does not require user interaction.",
  "id": "GHSA-4gg8-4j5v-pvfm",
  "modified": "2025-08-18T18:30:35Z",
  "published": "2025-08-18T18:30:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-54234"
    },
    {
      "type": "WEB",
      "url": "https://helpx.adobe.com/security/products/coldfusion/apsb25-52.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-4GGG-H7PH-26QR

Vulnerability from github – Published: 2026-04-08 19:53 – Updated: 2026-04-09 19:05
VLAI
Summary
n8n-mcp has authenticated SSRF via instance-URL header in multi-tenant HTTP mode
Details

Impact

An authenticated Server-Side Request Forgery in n8n-mcp allows a caller holding a valid AUTH_TOKEN to cause the server to issue HTTP requests to arbitrary URLs supplied through multi-tenant HTTP headers. Response bodies are reflected back through JSON-RPC, so an attacker can read the contents of any URL the server can reach — including cloud instance metadata endpoints (AWS IMDS, GCP, Azure, Alibaba, Oracle), internal network services, and any other host the server process has network access to.

The primary at-risk deployments are multi-tenant HTTP installations where more than one operator can present a valid AUTH_TOKEN, or where a token is shared with less-trusted clients. Single-tenant stdio deployments and HTTP deployments without multi-tenant headers are not affected.

Affected versions

n8n-mcp ≤ 2.47.3 (all versions up to and including 2.47.3).

Patched versions

n8n-mcp 2.47.4 and later.

Workarounds

If you cannot immediately upgrade: 1. Egress filtering at the network layer — block outbound traffic from the n8n-mcp container to RFC1918 ranges (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16), link-local 169.254.0.0/16, and any other internal ranges. This defends against any future SSRF-class issue and is recommended even after upgrading. 2. Disable multi-tenant headers — if your deployment does not require per-request instance switching, unset ENABLE_MULTI_TENANT and do not accept x-n8n-url / x-n8n-key headers at the reverse proxy. 3. Restrict AUTH_TOKEN distribution — ensure the bearer token is only held by fully trusted operators until you can upgrade.

Remediation

Upgrade to n8n-mcp 2.47.4 or later. No configuration changes are required; the fix adds validation at the URL entry points and normalizes URLs at the API client layer.

Credits

Reported by the Eresus Security Research Team. @ibrahmsql

Severity
8.5 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 2.47.3"
      },
      "package": {
        "ecosystem": "npm",
        "name": "n8n-mcp"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.47.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-39974"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-918"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-08T19:53:48Z",
    "nvd_published_at": "2026-04-09T17:16:30Z",
    "severity": "HIGH"
  },
  "details": "## Impact\nAn authenticated Server-Side Request Forgery in `n8n-mcp` allows a caller holding a valid `AUTH_TOKEN` to cause the server to issue HTTP requests to arbitrary URLs supplied through multi-tenant HTTP headers. Response bodies are reflected back through JSON-RPC, so an attacker can read the contents of any URL the server can reach \u2014 including cloud instance metadata endpoints (AWS IMDS, GCP, Azure, Alibaba, Oracle), internal network services, and any other host the server process has network access to.\n\nThe primary at-risk deployments are multi-tenant HTTP installations where more than one operator can present a valid `AUTH_TOKEN`, or where a token is shared with less-trusted clients. Single-tenant stdio deployments and HTTP deployments without multi-tenant headers are not affected.\n\n## Affected versions\n`n8n-mcp` \u2264 `2.47.3` (all versions up to and including 2.47.3).\n\n## Patched versions\n`n8n-mcp` `2.47.4` and later.\n\n## Workarounds\nIf you cannot immediately upgrade:\n1. **Egress filtering at the network layer** \u2014 block outbound traffic from the `n8n-mcp` container to RFC1918 ranges (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16), link-local `169.254.0.0/16`, and any other internal ranges. This defends against any future SSRF-class issue and is recommended even after upgrading.\n2. **Disable multi-tenant headers** \u2014 if your deployment does not require per-request instance switching, unset `ENABLE_MULTI_TENANT` and do not accept `x-n8n-url` / `x-n8n-key` headers at the reverse proxy.\n3. **Restrict `AUTH_TOKEN` distribution** \u2014 ensure the bearer token is only held by fully trusted operators until you can upgrade.\n\n## Remediation\nUpgrade to `n8n-mcp` 2.47.4 or later. No configuration changes are required; the fix adds validation at the URL entry points and normalizes URLs at the API client layer.\n\n## Credits\nReported by the Eresus Security Research Team. @ibrahmsql",
  "id": "GHSA-4ggg-h7ph-26qr",
  "modified": "2026-04-09T19:05:56Z",
  "published": "2026-04-08T19:53:48Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-4ggg-h7ph-26qr"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-39974"
    },
    {
      "type": "WEB",
      "url": "https://github.com/czlonkowski/n8n-mcp/commit/d9d847f230923d96e0857ccecf3a4dedcc9b0096"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/czlonkowski/n8n-mcp"
    },
    {
      "type": "WEB",
      "url": "https://github.com/czlonkowski/n8n-mcp/releases/tag/v2.47.4"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "n8n-mcp has authenticated SSRF via instance-URL header in multi-tenant HTTP mode"
}

No mitigation information available for this CWE.

CAPEC-664: Server Side Request Forgery

An adversary exploits improper input validation by submitting maliciously crafted input to a target application running on a server, with the goal of forcing the server to make a request either to itself, to web services running in the server’s internal network, or to external third parties. If successful, the adversary’s request will be made with the server’s privilege level, bypassing its authentication controls. This ultimately allows the adversary to access sensitive data, execute commands on the server’s network, and make external requests with the stolen identity of the server. Server Side Request Forgery attacks differ from Cross Site Request Forgery attacks in that they target the server itself, whereas CSRF attacks exploit an insecure user authentication mechanism to perform unauthorized actions on the user's behalf.

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