What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-26 · updated 2026-10-26
• Weakness: CWE-918

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

• frappe builder: from 1.0.0 before 1.36.1 — fixed in 1.36.1

How to fix

Upgrade to a fixed version: frappe builder 1.36.1. Check the vendor advisory for mitigations.

References

• https://github.com/frappe/builder/releases/tag/v1.36.1
• https://github.com/frappe/builder/security/advisories/GHSA-hvrf-fhv3-3v7p
• https://www.vulncheck.com/advisories/frappe-builder-before-ssrf-guard-bypass-via-http-redirect

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