Medium severity · published Aug 10, 2023
CVE-2023-39961
Nextcloud Server provides data storage for Nextcloud, an open source cloud platform
4.3
CVSS
0.6%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 48% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NS
Nextcloud Server · Nextcloud
25.0.0 before 25.0.9; 25.0.0 before 25.0.9; 26.0.0 before 26.0.4; 26.0.0 before 26.0.4; 27.0.0; 27.0.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-39961
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-39961
Vendor Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-qhgm-w4gx-gvgp
Patch
https://github.com/nextcloud/text/pull/4481
Permissions Required
https://hackerone.com/reports/1965156
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