Medium severity · published Oct 26, 2026
CVE-2026-115718
Frappe Builder 1.33.0 before 1.36.0 Missing Authorization via improve_prompt
New
4.3
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 24% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
BU
builder · frappe
1.33.0 before 1.36.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-115718
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-115718
github.com
https://github.com/frappe/builder/releases/tag/v1.36.0
github.com
https://github.com/frappe/builder/security/advisories/GHSA-58mj-c563-p78w
www.vulncheck.com
https://www.vulncheck.com/advisories/frappe-builder-before-missing-authorization-via-improve-prompt
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