Vulnerability-Lookup

CVE-2026-55792 (GCVE-0-2026-55792)

Vulnerability from cvelistv5 – Published: 2026-07-01 23:20 – Updated: 2026-07-02 14:49

Title

Craft CMS: Sensitive File Disclosure / Server-Side File Read

Summary

Craft CMS is a content management system (CMS). In versions starting from 4.0.0-RC1 and prior to 4.18.0, and 5.0.0-RC1 and above, prior to 5.10.0, the dataUrl() Twig function is included in Craft’s Twig sandbox allowlist, allowing any control panel user granted the utility:system-messages permission to embed a file-reading payload into system email templates. When those emails are sent, the server reads the target file and returns its contents as a base64-encoded data URL embedded in the email body. The .env file, which typically contains the database password, CRAFT_SECURITY_KEY, and third-party API keys, passes all of Craft’s existing dataUrl() protection checks and is fully exfiltrated. Obtaining CRAFT_SECURITY_KEY enables an attacker to forge session tokens and escalate to full admin account takeover. This issue has been fixed in versions 4.18.0 and 5.10.0.

Severity

6 (Medium)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-02 14:48 UTC

CWE

CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7838 records in the last 180 days details

References

2 references

URL	Tags
https://github.com/craftcms/cms/security/advisori…	x_refsource_CONFIRM
https://github.com/craftcms/cms/pull/18559	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
craftcms	cms	Affected: >= 4.0.0-RC1, < 4.18.0 Affected: >= 5.0.0-RC1, < 5.10.0	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-55792

Vulnerability from fkie_nvd - Published: 2026-07-02 00:16 - Updated: 2026-10-25 21:10

Severity

6.0 (Medium) - CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/craftcms/cms/pull/18559
	security-advisories@github.com	https://github.com/craftcms/cms/security/advisories/GHSA-287w-mxq6-x2cp
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/craftcms/cms/pull/18559

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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      "affectedData": [
        {
          "product": "cms",
          "vendor": "craftcms",
          "versions": [
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    },
    {
      "lang": "es",
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          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/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": "HIGH",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-55792",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-07-02T14:48:43.714822Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-07-02T00:16:44.940",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/craftcms/cms/pull/18559"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/craftcms/cms/security/advisories/GHSA-287w-mxq6-x2cp"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/craftcms/cms/pull/18559"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-200"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-287W-MXQ6-X2CP

Vulnerability from github – Published: 2026-07-06 21:29 – Updated: 2026-07-06 21:29

Summary

Craft CMS: Sensitive File Disclosure / Server-Side File Read

Details

The dataUrl() Twig function is included in Craft’s Twig sandbox allowlist, allowing any control panel user granted the utility:system-messages permission to embed a file-reading payload into system email templates. When those emails are sent, the server reads the target file and returns its contents as a base64-encoded data URL embedded in the email body. The .env file, which typically contains the database password, CRAFT_SECURITY_KEY, and third-party API keys, passes all of Craft’s existing dataUrl() protection checks and is fully exfiltrated. Obtaining CRAFT_SECURITY_KEY enables an attacker to forge session tokens and escalate to full admin account takeover.

Details

Affected versions: Craft CMS 4.x, 5.x (confirmed against 5.9.19)

The vulnerability arises from the combination of three code facts: 1. dataUrl is in the Twig sandbox allowlist src/config/twig-sandbox.php, line 115: php'allowedFunctions' => [ ... 'dataUrl', // ← allows file reading inside sandboxed templates ... ],

Html::dataUrl() does not block dotfiles src/helpers/Html.php, lines 1065–1090. The function applies four checks before reading a file:

Must be within the project root .env is at the root Must not be in a system directory (config/, vendor/, storage/, templates/) .env is not Must not be a .php file .env has no extension File must exist .env always exists in a Craft install

There is no check for dotfiles or specifically for .env. All four checks pass silently and file_get_contents() is called, with the result returned as data:text/plain;base64,....

System message body is rendered via renderSandboxedString() src/mail/Mailer.php, lines 181–183: php$subject = $view->renderSandboxedString($systemMessage->subject, $variables); $textBody = $view->renderSandboxedString($systemMessage->body, $variables); $htmlBody = $view->renderSandboxedString($systemMessage->body, $variables, escapeHtml: true);

Any body content saved to a system message is executed inside the Twig sandbox when the email renders. Because dataUrl is in allowedFunctions, the sandbox policy permits its execution without restriction.

Access control: The utility:system-messages permission is a non-admin CP permission grantable to any user group via Settings > Users > Groups. It is not restricted to admins.

Impact

Vulnerability type: Sensitive File Disclosure / Server-Side File Read Who is impacted: Any Craft CMS 4.x or 5.x installation where at least one non-admin control panel user has been granted the utility:system-messages permission, and email sending is configured.

Resources:

https://github.com/craftcms/cms/pull/18559

Severity

6.0 (Medium)


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

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "craftcms/cms"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.0.0-RC1"
            },
            {
              "fixed": "4.18.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "craftcms/cms"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.0.0-RC1"
            },
            {
              "fixed": "5.10.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-55792"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-200"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-06T21:29:49Z",
    "nvd_published_at": "2026-07-02T00:16:44Z",
    "severity": "MODERATE"
  },
  "details": "The `dataUrl()` Twig function is included in Craft\u2019s Twig sandbox allowlist, allowing any control panel user granted the `utility:system-messages` permission to embed a file-reading payload into system email templates. When those emails are sent, the server reads the target file and returns its contents as a base64-encoded data URL embedded in the email body. The .env file, which typically contains the database password, CRAFT_SECURITY_KEY, and third-party API keys, passes all of Craft\u2019s existing `dataUrl()` protection checks and is fully exfiltrated. Obtaining CRAFT_SECURITY_KEY enables an attacker to forge session tokens and escalate to full admin account takeover.\n\n## Details\nAffected versions: Craft CMS 4.x, 5.x (confirmed against 5.9.19)\n\nThe vulnerability arises from the combination of three code facts:\n1. dataUrl is in the Twig sandbox allowlist\nsrc/config/twig-sandbox.php, line 115:\nphp\u0027allowedFunctions\u0027 =\u003e [\n    ...\n    \u0027dataUrl\u0027,   // \u2190 allows file reading inside sandboxed templates\n    ...\n],\n\n2. Html::dataUrl() does not block dotfiles\nsrc/helpers/Html.php, lines 1065\u20131090. The function applies four checks before reading a file:\n\nMust be within the project root .env is at the root\nMust not be in a system directory (config/, vendor/, storage/, templates/) .env is not\nMust not be a .php file  .env has no extension\nFile must exist .env always exists in a Craft install\n\nThere is no check for dotfiles or specifically for .env. All four checks pass silently and file_get_contents() is called, with the result returned as data:text/plain;base64,....\n\n3. System message body is rendered via renderSandboxedString()\nsrc/mail/Mailer.php, lines 181\u2013183:\nphp$subject = $view-\u003erenderSandboxedString($systemMessage-\u003esubject, $variables);\n$textBody = $view-\u003erenderSandboxedString($systemMessage-\u003ebody, $variables);\n$htmlBody = $view-\u003erenderSandboxedString($systemMessage-\u003ebody, $variables, escapeHtml: true);\n\nAny body content saved to a system message is executed inside the Twig sandbox when the email renders. Because dataUrl is in allowedFunctions, the sandbox policy permits its execution without restriction.\n\nAccess control: The utility:system-messages permission is a non-admin CP permission grantable to any user group via Settings \u003e Users \u003e Groups. It is not restricted to admins.\n\n## Impact\nVulnerability type: Sensitive File Disclosure / Server-Side File Read\nWho is impacted: Any Craft CMS 4.x or 5.x installation where at least one non-admin control panel user has been granted the utility:system-messages permission, and email sending is configured.\n\nResources:\n\n- https://github.com/craftcms/cms/pull/18559",
  "id": "GHSA-287w-mxq6-x2cp",
  "modified": "2026-07-06T21:29:49Z",
  "published": "2026-07-06T21:29:49Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/craftcms/cms/security/advisories/GHSA-287w-mxq6-x2cp"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55792"
    },
    {
      "type": "WEB",
      "url": "https://github.com/craftcms/cms/pull/18559"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/craftcms/cms"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Craft CMS: Sensitive File Disclosure / Server-Side File Read"
}

Sightings

Author	Source	Type	Date	Other

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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.

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CVE-2026-55792 (GCVE-0-2026-55792)

FKIE_CVE-2026-55792

GHSA-287W-MXQ6-X2CP

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