Critical severity · published Dec 22, 2023
CVE-2023-49792
Nextcloud Server provides data storage for Nextcloud, an open source cloud platform
9.8
CVSS
1%
EPSS
No
On KEV
Description
Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. In Nextcloud Server prior to versions 26.0.9 and 27.1.4; as well as Nextcloud Enterprise Server prior to versions 23.0.12.13, 24.0.12.9, 25.0.13.4, 26.0.9, and 27.1.4; when a (reverse) proxy is configured as trusted proxy the server could be tricked into reading a wrong remote address for an attacker, allowing them executing authentication attempts than intended. Nextcloud Server versions 26.0.9 and 27.1.4 and Nextcloud Enterprise Server versions 23.0.12.13, 24.0.12.9, 25.0.13.4, 26.0.9, and 27.1.4 contain a patch for this issue. No known workarounds are available.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.0% · higher than 64% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NS
Nextcloud Server · Nextcloud
23.0.0 before 23.0.12.13; 24.0.0 before 24.0.12.9; 25.0.0 before 25.0.13.4; 26.0.0 before 26.0.9; 26.0.0 before 26.0.9; 27.0.0 before 27.1.4; +1 more · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-49792
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-49792
Vendor Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-5j2p-q736-hw98
Patch
https://github.com/nextcloud/server/pull/41526
Permissions Required
https://hackerone.com/reports/2230915
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