CVE-2023-25816: nextcloud vulnerable to Uncontrolled Resource Consumption

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.4% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2023-02-25 · updated 2026-06-17
Weakness: CWE-400

Description

Nextcloud is an Open Source private cloud software. Versions 25.0.0 and above, prior to 25.0.3, are subject to Uncontrolled Resource Consumption. A user can configure a very long password, consuming more resources on password validation than desired. This issue is patched in 25.0.3 No workaround is available.

Affected products

Nextcloud Server: from 25.0.0 before 25.0.3 — fixed in 25.0.3

How to fix

Upgrade to a fixed version: Nextcloud Server 25.0.3. Check the vendor advisory for mitigations.

References

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-53q2-cm29-7j83
https://github.com/nextcloud/server/pull/35965
https://hackerone.com/reports/1820864
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-53q2-cm29-7j83
https://github.com/nextcloud/server/pull/35965
https://hackerone.com/reports/1820864

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