CVE-2026-66002: frappe · Observable Response Discrepancy
Affects frappeSource GCVE Database
Not known to be exploited · CVSS 6.9 Medium : upgrade to 16.27.0 or 15.115.0 when convenient.
Data as of 26 Oct 2026, 17:16 UTC
- EPSS
- 0.8% chance of exploitation in 30 days – higher than 57% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 16.27.0, 15.115.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:NExploitation evidence
Disclosed: evidence found.
CVE published 20 Aug 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Upgrade frappe to 16.27.0 or 15.115.0.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| frappe frappe | Affected
| Fixed in
|
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.
References
- github.com/frappe/frappe/security/advisories/GHSA-c2xv-c53h-qvr5 (opens in a new tab)
- github.com/frappe/frappe/pull/40787 (opens in a new tab)
- github.com/frappe/frappe/pull/40814 (opens in a new tab)
- github.com/frappe/frappe/pull/40815 (opens in a new tab)
- github.com/frappe/frappe/commit/30fe0b4118ff94c95c239dce4bc74ec4ca10a827 (opens in a new tab)
- github.com/frappe/frappe/commit/47a396ec59f5362029feb349eb2b9d10a21afcf8 (opens in a new tab)
- github.com/frappe/frappe/commit/4b32a4e0072e61ce0abcb0d09cfd1f14724fe896 (opens in a new tab)
- github.com/frappe/frappe/releases/tag/v15.115.0 (opens in a new tab)
- github.com/frappe/frappe/releases/tag/v16.27.0 (opens in a new tab)