CVE-2023-39960

Nextcloud Server has improper restriction of excessive authentication attempts on WebDAV endpoint

HIGH

7.5

CVSS Score

Published: October 13, 2023 at 12:07 PM UTC

Updated: June 17, 2026 at 06:13 AM UTC

1 product affected across 1 vendorNextcloud/server

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Severity

HIGH7.5

Exploit prediction

EPSS 0.7%

SSVC

No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Nextcloud/server · Nextcloudnextcloud-app

95%

22.0.0 ≤ v < 22.2.10.1423.0.0 ≤ v < 23.0.12.924.0.0 ≤ v < 24.0.12.525.0.0 ≤ v < 25.0.926.0.0 ≤ v < 26.0.4

Affected range stops below 22.2.10.14, so it looks safe — our inference, not a vendor statement

Affected range stops below 23.0.12.9, so it looks safe — our inference, not a vendor statement

Affected range stops below 24.0.12.5, so it looks safe — our inference, not a vendor statement

Affected range stops below 25.0.9, so it looks safe — our inference, not a vendor statement

Affected range stops below 26.0.4, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

x_refsource_CONFIRMVendor Advisory

Source: [email protected]

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-2hrc-5fgp-c9c9

x_refsource_MISCIssue TrackingPatch

Source: [email protected]

https://github.com/nextcloud/server/pull/38046

x_refsource_MISCThird Party Advisory

Source: [email protected]

https://hackerone.com/reports/1924212

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGH[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: NONE
Availability: NONE

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-307

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