CVE-2026-115718
CVE-2026-115718
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.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.
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.
Weakness classification (CWE)
References
- github.com/frappe/builder/releases/tag/v1.36.0 (patch)
- github.com/frappe/builder/security/advisories/GHSA-58mj-c563-p78w (vendor-advisory)
- www.vulncheck.com/advisories/frappe-builder-before-missing-authorization-via-im… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-115718?
- CVE-2026-115718 is a medium-severity vulnerability, classified under Missing Authorization. CVSS score: 4.3/10. Published 2026-10-26.
- How severe is CVE-2026-115718?
- Medium severity. CVSS v3 base score is 4.3 out of 10.