CVE-2023-35928Nextcloud user scoped external storage can be used to gather credentials of other users
- 8.5HighCVSS base score
- 0.98%Exploitation in 30 daysEPSS · top 37% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
Nextcloud Server is a space for data storage on Nextcloud, a self-hosted productivity playform. In NextCloud Server versions 25.0.0 until 25.0.7 and 26.0.0 until 26.0.2 and Nextcloud Enterprise Server versions 19.0.0 until 19.0.13.9, 20.0.0 until 20.0.14.14, 21.0.0 until 21.0.9.12, 22.0.0 until 22.2.10.12, 23.0.0 until 23.0.12.7, 24.0.0 until 24.0.12.2, 25.0.0 until 25.0.7, and 26.0.0 until 26.0.2, a user could use this functionality to get access to the login credentials of another user and take over their account. This issue has been patched in Nextcloud Server versions 25.0.7 and 26.0.2 and NextCloud Enterprise Server versions 19.0.13.9, 20.0.14.14, 21.0.9.12, 22.2.10.12, 23.0.12.7, 24.0.12.2, 25.0.7, and 26.0.2. Three workarounds are available. Disable app files_external. Change config setting "Allow users to mount external storage" to disabled in "Administration" > "External storage" settings `…/index.php/settings/admin/externalstorages`. Change config setting to disallow users to create external storages in "Administration" > "External storage" settings `…/index.php/settings/admin/externalstorages` with the types FTP, Nextcloud, SFTP, and/or WebDAV.
Timeline
ID reserved
By GitHub_M
- 3 days later
· 3 days later
Published
- 18 months later
· 18 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | High8.5 | CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | High8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.98% · top 37% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.5.
Affected products
nextcloud · security-advisories
- affected Nextcloud Enterprise Server >= 19.0.0, < 19.0.13.9
- affected Nextcloud Enterprise Server >= 20.0.0.0, < 20.0.14.14
- affected Nextcloud Enterprise Server >= 21.0.0.0, < 21.0.9.12
- affected Nextcloud Enterprise Server >= 22.0.0.0, < 22.2.10.12
- affected Nextcloud Enterprise Server >= 23.0.0.0, < 23.0.12.7
- affected Nextcloud Enterprise Server >= 24.0.0.0, < 24.0.12.2
- affected Nextcloud Enterprise Server >= 25.0.0, < 25.0.7
- affected Nextcloud Enterprise Server >= 26.0.0, < 26.0.2
- affected Nextcloud Server >= 25.0.0, < 25.0.7
- affected Nextcloud Server >= 26.0.0, < 26.0.2
References
References3
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-637g-xp2c-qh5h (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://github.com/nextcloud/server/pull/38265 (opens in a new tab)x_refsource_MISCx_transferred
- https://hackerone.com/reports/1978882 (opens in a new tab)x_refsource_MISCx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2023-39917 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2023-35928)Record last updated .