Home/CVE/Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 25.0.0 and prio
CVE

CVE-2023-48239

Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 25.0.0 and prio

Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 25.0.0 and prior to versions 25.0.13, 26.0.8, and 27.1.3 of Nextcloud Server and starting in version 20.0.0 and prior to versions 20.0.14.16, 21.0.9.13, 22.2.10.15, 23.0.12.12, 24.0.12.8, 25.0.13, 26.0.8, and 27.1.3 of Nextcloud Enterprise Server, a malicious user could update any personal or global external storage, making them inaccessible for everyone else as well. Nextcloud Server 25.0.13, 26.0.8, and 27.1.3 and Nextcloud Enterprise Server is upgraded to 20.0.14.16, 21.0.9.13, 22.2.10.15, 23.0.12.12, 24.0.12.8, 25.0.13, 26.0.8, and 27.1.3 contain a patch for this issue.

As a workaround, disable app files_external. This workaround also makes the external storage inaccessible but retains the configurations until a patched version has been deployed.

HIGH · CVSS 8.5 EPSS 0.00582
Act now
  • Public exploit or PoC is available
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-284Improper Access Control
▤

Affected Products & Versions

8
nextcloud server>= 20.0.0 and < 20.0.14.16
nextcloud server>= 21.0.0 and < 21.0.9.13
nextcloud server>= 22.0.0 and < 22.2.10.15
nextcloud server>= 23.0.0 and < 23.0.12.12
nextcloud server>= 24.0.0 and < 24.0.12.8
nextcloud server>= 25.0.0 and < 25.0.13
nextcloud server>= 26.0.0 and < 26.0.8
nextcloud server>= 27.0.0 and < 27.1.3
⚠

Public Exploits & PoCs

1
pochackerone.com · 2212627hackerone.com
▣

Scoring & Timeline

8.5
HIGH · CVSS v3.1 · security-advisories@github.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD21 Nov 2023 · 09:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-f962-hw26-g267Vendor Advisory
https://github.com/nextcloud/server/pull/41123Patch
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