Vulnerability record · CVE-2023-48303 · published 21 November 2023

CVE-2023-48303: Nextcloud server improper access control vulnerability

Nextcloud · Nextcloud Server

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.

2.7 CVSS 3.1 Low EPSS 0.67% · top 49.9% CWE-284 · Improper access control

2.7CVSS 3.1 base score

0.67%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

6References

17 Jun 2026Last modified by NVD

Description

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

Nextcloud Server Nextcloud

References

Link	Tags
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-2448-44rp-c7hh	Vendor Advisory
https://github.com/nextcloud/server/pull/39895	Issue TrackingPatch
https://hackerone.com/reports/2107934	Permissions Required
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-2448-44rp-c7hh	Vendor Advisory
https://github.com/nextcloud/server/pull/39895	Issue TrackingPatch
https://hackerone.com/reports/2107934	Permissions Required

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2023-48303), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.