SSRF in Frappe Builder
CVE-2026-115720
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.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.0 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/frappe/builder/releases/tag/v1.36.1 (patch)
- github.com/frappe/builder/security/advisories/GHSA-hvrf-fhv3-3v7p (vendor-advisory)
- www.vulncheck.com/advisories/frappe-builder-before-ssrf-guard-bypass-via-http-r… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-115720?
- CVE-2026-115720 is a medium-severity vulnerability in Frappe Builder, classified under Server-Side Request Forgery (SSRF). CVSS score: 5.0/10. Published 2026-10-26.
- How severe is CVE-2026-115720?
- Medium severity. CVSS v3 base score is 5.0 out of 10.