5.3 Medium

Frappe Builder versions 1.33.0 before1.36.0 contain a missing authorization vulnerability in the improveprompt endpoint that allows any…

CVE-2026-115718

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

Assessment

CVSS: 5.3 (v4.0)
Severity: Medium
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 26 October 2026
Last updated: 26 October 2026
Weakness: CWE-862
Assigner: disclosure@vulncheck.com

CVSS vectorCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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