What’s Vulnerable › Vulnerabilities

CVE-2023-39961: Text does not respect "Allow download" permissions

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-08-10 · updated 2026-06-17
• Weakness: CWE-284

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.

Affected products

• Nextcloud Server: from 25.0.0 before 25.0.9; from 26.0.0 before 26.0.4; 27.0.0 — fixed in 25.0.9, 26.0.4

How to fix

Upgrade to a fixed version: Nextcloud Server 25.0.9, 26.0.4. Check the vendor advisory for mitigations.

References

• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-qhgm-w4gx-gvgp
• https://github.com/nextcloud/text/pull/4481
• https://hackerone.com/reports/1965156
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-qhgm-w4gx-gvgp
• https://github.com/nextcloud/text/pull/4481
• https://hackerone.com/reports/1965156

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