Vulnerability · Published Oct 26, 2026 · Assigned by VulnCheck

CVE-2026-115718Frappe Builder 1.33.0 before 1.36.0 Missing Authorization via improve_prompt

Medium 4.3

In plain English

A medium-severity missing authorization 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 24% of all known vulnerabilities).

Severity (CVSS 3.1)4.3Medium

Exploit odds (30 days)0.3%top 75.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Frappe Builder versions 1.33.0 before1.36.0 contain a missing authorization vulnerability in the improve_prompt endpoint that allows any authenticated non-Guest session to invoke LLM completions without proper permission checks. Attackers can call the improve_prompt API to leverage the site owner's stored OpenRouter API key via resolve_api_key, consuming paid LLM credits and effectively turning the site into a free LLM proxy.

Affected products (as reported)

Vendor	Product	Versions
frappe	builder	1.33.0 – before 1.36.0

Weakness: CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

References

Vendor Patch patch
Vendor Advisory vendor-advisory
VulnCheck Advisory: Frappe Builder 1.33.0 before 1.36.0 Missing Authorization via improve_prompt third-party-advisory