CVE-2023-48303 json
Nextcloud Server admins can change authentication details of user configured external storage
published 2023-11-21 2 y ago modified 2026-06-17 4 mo ago also EUVD-2023-52363
- cvss
- 2.4
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.7%
- EPSS 0.7% chance of exploitation in 30 days, percentile 52%
- public exploits
- 0
- none known
Summary
Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 25.0.0 and prior to versions 25.0.11, 26.0.6, and 27.1.0 of Nextcloud Server and Nextcloud Enterprise Server, admins can change authentication details of user configured external storage. Nextcloud Server and Nextcloud Enterprise Server versions 25.0.11, 26.0.6, and 27.1.0 contain a patch for this issue. No known workarounds are available.
Patch / fix
Exploit prediction
0.67% chance of exploitation in the next 30 days, higher than 52% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 2.4 | CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:N/A:L |
| NVD | 3.1 | 2.7 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N |
Affected products
- nextcloud security-advisories
Classification
- Weakness
-
- CWE-284 Improper Access Control
References
-
github.com
/nextcloud/server/pull/39895
issue-tracking, patch
-
github.com
/nextcloud/security-advisories/security/advisories/GHSA-2448-44rp-c7hh
vendor-advisory
-
hackerone.com
/reports/2107934
permissions-required
Sources
- CVE List CVE-2023-48303
- NVD CVE-2023-48303
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.