Vulnerability · Published Oct 26, 2026 · Assigned by VulnCheck

CVE-2026-115720Frappe Builder before 1.36.1 SSRF Guard Bypass via HTTP Redirect

Medium 5.0

In plain English

A medium-severity server-side request forgery in builder from frappe. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 28% of all known vulnerabilities).

Severity (CVSS 3.1)5.0Medium

Exploit odds (30 days)0.3%top 72.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
frappe	builder	1.0.0 – before 1.36.1

Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N

References

Vendor Patch patch
Vendor Advisory vendor-advisory
VulnCheck Advisory: Frappe Builder before 1.36.1 SSRF Guard Bypass via HTTP Redirect third-party-advisory