Description
Frappe Builder before 1.36.1 contains a server-side request forgery vulnerability in builder/api.py where the assert_not_private_url() guard validates only the initial hostname before callers invoke requests.get(url) with default redirect-following and no IP pinning, allowing an attacker-supplied public URL to HTTP-redirect to internal or link-local addresses the guard never validated. An authenticated attacker can call the convert_to_webp endpoint, which lacks a permission decorator, with a URL that redirects to internal targets such as cloud metadata services to perform SSRF, internal port scanning, or trigger a request-hang denial of service due to the missing timeout.
Published: 2026-10-26
Score: 5.3 Medium
EPSS: n/a
KEV: No
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Remediation

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History

Mon, 26 Oct 2026 13:15:00 +0100

Type Values Removed Values Added
Description Frappe Builder before 1.36.1 contains a server-side request forgery vulnerability in builder/api.py where the assert_not_private_url() guard validates only the initial hostname before callers invoke requests.get(url) with default redirect-following and no IP pinning, allowing an attacker-supplied public URL to HTTP-redirect to internal or link-local addresses the guard never validated. An authenticated attacker can call the convert_to_webp endpoint, which lacks a permission decorator, with a URL that redirects to internal targets such as cloud metadata services to perform SSRF, internal port scanning, or trigger a request-hang denial of service due to the missing timeout.
Title Frappe Builder before 1.36.1 SSRF Guard Bypass via HTTP Redirect
First Time appeared Frappe
Frappe builder
Weaknesses CWE-918
CPEs cpe:2.3:a:frappe:builder:*:*:*:*:*:*:*:*
Vendors & Products Frappe
Frappe builder
References
Metrics cvssV3_1

{'score': 5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N'}

cvssV4_0

{'score': 5.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N'}

Subscriptions

Frappe Builder
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-26T12:02:25.906Z

Reserved: 2026-10-23T11:14:36.357Z

Link: CVE-2026-115720

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-26T12:17:05.787

Modified: 2026-10-26T12:17:05.787

Link: CVE-2026-115720

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-26T14:30:08Z

Weaknesses
  • CWE-918

    Server-Side Request Forgery (SSRF)