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CVE-2023-28835 Details

Description

Nextcloud server is an open source home cloud implementation. In affected versions the generated fallback password when creating a share was using a weak complexity random number generator, so when the sharer did not change it the password could be guessable to an attacker willing to brute force it. It is recommended that the Nextcloud Server is upgraded to 24.0.10 or 25.0.4. This issue only affects users who do not have a password policy enabled, so enabling a password policy is an effective mitigation for users unable to upgrade.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CNA: [email protected]CVSS-B:3.5 LOWVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-7w2p-rp9m-9xp9	CVE	Vendor Advisory
https://github.com/nextcloud/server/pull/36093	CVE	Issue TrackingPatch
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-7w2p-rp9m-9xp9	[email protected]	Vendor Advisory
https://github.com/nextcloud/server/pull/36093	[email protected]	Issue TrackingPatch

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-338	Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)	[email protected]

Affected Products

Product	Versions
nextcloud nextcloud server	>= 23.0.0, < 23.0.14 >= 24.0.0, < 24.0.10 >= 25.0.0, < 25.0.4
CPE cpe:2.3:a:nextcloud:nextcloud_server:::::enterprise:::* cpe:2.3:a:nextcloud:nextcloud_server:::::-:::* Remediation No remediation found in references.

Change History

5 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Jun 17, 2026	CVE Modified	CISA-ADP
Nov 21, 2024	CVE Modified	CVE
May 14, 2024	CVE Modified	[email protected]
Apr 7, 2023	Initial Analysis	[email protected]