Nextcloud Server's brute force protection allows someone to send more requests than intended

8.7 CVSS

Vulnerability Description

Nextcloud Server is a data storage system for Nextcloud, a self-hosted productivity platform. When multiple requests are sent in parallel, all of them were executed even if the amount of faulty requests succeeded the limit by the time the response was sent to the client. This allowed someone to send as many requests the server could handle in parallel to bruteforce protected details instead of the configured limit, default 8. Nextcloud Server versions 25.0.7 and 26.0.2 and Nextcloud Enterprise Server versions 21.0.9.12, 22.2.10.12, 23.0.12.7, 24.0.12.2, 25.0.7 and 26.0.2 contain patches for this issue.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

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Affected Vendor

nextcloud

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Affected Software

security-advisories

Vulnerable Versions:

Nextcloud Server >= 25.0.0, < 25.0.7, Nextcloud Server >= 26.0.0, < 26.0.2, Nextcloud Enterprise Server >= 21.0.0, < 21.0.9.12, Nextcloud Enterprise Server >= 22.0.0, < 22.2.10.12, Nextcloud Enterprise Server >= 23.0.0, < 23.0.12.7, Nextcloud Enterprise Server >= 24.0.0, < 24.0.12.2, Nextcloud Enterprise Server >= 25.0.0, < 25.0.7, Nextcloud Enterprise Server >= 26.0.0, < 26.0.2