How severe is CVE-2026-66002?

CVE-2026-66002 has a CVSS 4.0 base score of 6.9, rated medium severity.

Is CVE-2026-66002 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-66002?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2026-66002 published?

CVE-2026-66002 was published on 2026-08-20 and last updated on 2026-08-21.

CVE-2026-66002

CVE-2026-66002 is a medium-severity vulnerability with a CVSS 4.0 base score of 6.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-204.

Key facts

Severity: Medium (CVSS 4.0 base score 6.9)
EPSS exploit prediction: 0% (39th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-204
Published: 2026-08-20
Last modified: 2026-08-21

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.

Frequently asked questions

What is CVE-2026-66002?: 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.
How severe is CVE-2026-66002?: CVE-2026-66002 has a CVSS 4.0 base score of 6.9, rated medium severity.
Is CVE-2026-66002 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-66002?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-66002 published?: CVE-2026-66002 was published on 2026-08-20 and last updated on 2026-08-21.

References

Other CWE-204 vulnerabilities

CVE-2018-25350 — Critical (CVSS 9.8): userSpice 4.3.24 contains a username enumeration vulnerability that allows unauthenticated attackers to discover valid…
CVE-2026-15747 — Critical (CVSS 9.1): Mojolicious versions from 4.59 before 9.48 for Perl expose a stable representation of the session CSRF token to a…
CVE-2026-69519 — High (CVSS 8.6): Observable response discrepancy in Azure Stack HCI allows an unauthorized attacker to disclose information over a…
CVE-2025-5485 — High (CVSS 8.6): User names used to access the web management interface are limited to the device identifier, which is a numerical…
CVE-2026-27462 — High (CVSS 7.5): Combodo iTop is a web based IT service management tool. Prior to 3.2.3, iTop returns different responses for…
CVE-2026-33419 — High (CVSS 7.5): MinIO is a high-performance object storage system. Prior to RELEASE.2026-03-17T21-25-16Z, MinIO AIStor's STS (Security…

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