What’s Vulnerable › Vulnerabilities

CVE-2023-25161: Nextcloud Server's missing rate limiting on password reset functionality allows sending lots of emails

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-02-13 · updated 2026-06-17
• Weakness: CWE-284

Description

Nextcloud Server is the file server software for Nextcloud, a self-hosted productivity platform. Nextcloud Server and Nextcloud Enterprise Server prior to versions 25.0.1 24.0.8, and 23.0.12 missing rate limiting on password reset functionality. This could result in service slowdown, storage overflow, or cost impact when using external email services. Users should upgrade to Nextcloud Server 25.0.1, 24.0.8, or 23.0.12 or Nextcloud Enterprise Server 25.0.1, 24.0.8, or 23.0.12 to receive a patch. No known workarounds are available.

Affected products

• Nextcloud Server: before 23.0.12; from 24.0.0 before 24.0.8; 25.0.0 — fixed in 23.0.12, 24.0.8

How to fix

Upgrade to a fixed version: Nextcloud Server 23.0.12, 24.0.8. Check the vendor advisory for mitigations.

References

• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-492h-596q-xr2f
• https://github.com/nextcloud/server/pull/34632
• https://hackerone.com/reports/1691195
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-492h-596q-xr2f
• https://github.com/nextcloud/server/pull/34632
• https://hackerone.com/reports/1691195

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