CVE-2023-28835

HighCVSS 7.5/10Last modified Jun 17, 2026

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 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Weakness enumeration

CWE-338

Affected software

Vendor	Product	Versions
nextcloud	security-advisories	< 24.0.10; >= 25.0.0, < 25.0.4

References

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-7w2p-rp9m-9xp9Vendor Advisory
https://github.com/nextcloud/server/pull/36093Issue Tracking, Patch
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-7w2p-rp9m-9xp9Vendor Advisory
https://github.com/nextcloud/server/pull/36093Issue Tracking, Patch

Timeline

Published: Mar 30, 2023
Last modified: Jun 17, 2026
NVD status: Modified

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