# CVE-2026-66002

## Summary

- **CVE ID:** CVE-2026-66002
- **Severity:** MEDIUM
- **CVSS Score:** 6.9 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N)
- **CWE:** CWE-204
- **Published:** Aug 20, 2026
- **Last Modified:** Aug 21, 2026

## Description

Frappe is a full-stack web application framework. Prior to 15.115.0 and 16.27.0, the public request-data web form and PersonalDataDownloadRequest class in frappe/website/doctype/personal_data_download_request/personal_data_download_request.py return distinguishable response shapes for registered and unregistered email addresses, including the user_name field and persistence behavior. A remote attacker can compare the responses to enumerate registered users. This issue is fixed in versions 15.115.0 and 16.27.0.

## Affected Products

- frappe — frappe (< 15.115.0)
- frappe — frappe (>= 16.0.0-beta.1, < 16.27.0)

## References

- [CNA](https://github.com/frappe/frappe/security/advisories/GHSA-c2xv-c53h-qvr5)
- [CNA](https://github.com/frappe/frappe/pull/40787)
- [CNA](https://github.com/frappe/frappe/pull/40814)
- [CNA](https://github.com/frappe/frappe/pull/40815)
- [CNA](https://github.com/frappe/frappe/commit/30fe0b4118ff94c95c239dce4bc74ec4ca10a827)
- [CNA](https://github.com/frappe/frappe/commit/47a396ec59f5362029feb349eb2b9d10a21afcf8)
- [CNA](https://github.com/frappe/frappe/commit/4b32a4e0072e61ce0abcb0d09cfd1f14724fe896)
- [CNA](https://github.com/frappe/frappe/releases/tag/v15.115.0)
- [CNA](https://github.com/frappe/frappe/releases/tag/v16.27.0)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.47%
- **EPSS Percentile:** 39.1

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._