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Vulnerability record · CVE-2023-39961 · published 10 August 2023

CVE-2023-39961: Nextcloud server improper access control vulnerability

Nextcloud · Nextcloud Server

Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 24.0.4 and prior to versions 25.0.9, 26.0.4, and 27.0.1, when a folder with images or an image was shared without download permissions, the user could add the image inline into a text file and download it. Nextcloud Server versions 25.0.9, 26.0.4, and 27.0.1 and Nextcloud Enterprise Server versions 24.0.12.5, 25.0.9, 26.0.4, and 27.0.1 contain a patch for this issue. No known workarounds are available.

4.3 CVSS 3.1 Medium EPSS 0.59% · top 54.2% CWE-284 · Improper access control
4.3CVSS 3.1 base score
0.59%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 24.0.4 and prior to versions 25.0.9, 26.0.4, and 27.0.1, when a folder with images or an image was shared without download permissions, the user could add the image inline into a text file and download it. Nextcloud Server versions 25.0.9, 26.0.4, and 27.0.1 and Nextcloud Enterprise Server versions 24.0.12.5, 25.0.9, 26.0.4, and 27.0.1 contain a patch for this issue. No known workarounds are available.

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

Affected products

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

References

LinkTags
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-qhgm-w4gx-gvgp Vendor Advisory
https://github.com/nextcloud/text/pull/4481 Patch
https://hackerone.com/reports/1965156 Permissions Required
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-qhgm-w4gx-gvgp Vendor Advisory
https://github.com/nextcloud/text/pull/4481 Patch
https://hackerone.com/reports/1965156 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-2023-39961), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.