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

Quick assessment

Affected
frappe frappe
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Frappe是印度Frappe公司开源的一款构建业务应用的开发框架。 Frappe 15.115.0之前版本和16.27.0之前版本存在侧信道信息泄露漏洞，该漏洞源于frappe/website/doctype/personal_data_download_request/personal_data_download_request.py中的公开请求数据Web表单和PersonalDataDownloadRequest类对已注册和未注册的电子邮件地址返回可区分的响应形状，包括user_name字段和持久化

CVSS 6.9 · Medium EPSS 0.82% · P56

Possible ATT&CK Techniques 1 AI

T1589.001 · Credentials

Affected Version Matrix 2

VendorProduct Version RangeStatus
frappe frappe < 15.115.0 affected
>= 16.0.0-beta.1, < 16.27.0 affected
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I. Basic Information for CVE-2026-66002

Vulnerability Information
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Vulnerability Title
Frappe: User Enumeration via PDDR
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
响应差异性信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Frappe 侧信道信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Frappe是印度Frappe公司开源的一款构建业务应用的开发框架。 Frappe 15.115.0之前版本和16.27.0之前版本存在侧信道信息泄露漏洞，该漏洞源于frappe/website/doctype/personal_data_download_request/personal_data_download_request.py中的公开请求数据Web表单和PersonalDataDownloadRequest类对已注册和未注册的电子邮件地址返回可区分的响应形状，包括user_name字段和持久化
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
frappe frappe < 15.115.0 -

II. Public POCs for CVE-2026-66002

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III. Intelligence Information for CVE-2026-66002

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Patches & Fixes for CVE-2026-66002 (5)

Vendor Advisories for CVE-2026-66002 (1)

Vendor Pages for CVE-2026-66002 (1)

Same Patch Batch · frappe · 2026-08-20 · 5 CVEs total

CVE-2026-66001 8.5 HIGH Frappe: Improper Authorization in OAuth2 Consent Endpoint
CVE-2026-62315 7.1 HIGH Frappe: Mass assignment via set_value
CVE-2026-63654 6.9 MEDIUM Frappe: Unauthenticated Workflow approval via confirm_action
CVE-2026-53569 5.3 MEDIUM Frappe: Missing authorization in toggle_like and mark_as_seen

IV. Related Vulnerabilities

Same product: frappe
Same vendor: frappe
Same weakness: CWE-204

V. Comments for CVE-2026-66002

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