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Vulnerability record · CVE-2023-32320 · published 22 June 2023

CVE-2023-32320: Nextcloud server improper restriction of authentication attempts vulnerability

Nextcloud · Nextcloud Server

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.

7.5 CVSS 3.1 High EPSS 0.87% · top 42.8% CWE-307 · Improper restriction of authentication attempts
7.5CVSS 3.1 base score
0.87%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-qphh-6xh7-vffg PatchVendor Advisory
https://github.com/nextcloud/server/pull/38274 Patch
https://hackerone.com/reports/1918525 Permissions Required
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-qphh-6xh7-vffg PatchVendor Advisory
https://github.com/nextcloud/server/pull/38274 Patch
https://hackerone.com/reports/1918525 Permissions Required

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2023-32320), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.