CVE-2023-39958 - CVE House

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Status published Medium CVE-2023-39958

Missing brute force protection on password reset token OAuth2 API controller

5.8 CVSS

Vulnerability Description

Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 22.0.0 and prior to versions 22.2.10.13, 23.0.12.8, 24.0.12.5, 25.0.9, 26.0.4, and 27.0.1, missing protection allows an attacker to brute force the client secrets of configured OAuth2 clients. Nextcloud Server versions 25.0.9, 26.0.4, and 27.0.1 and Nextcloud Enterprise Server versions 22.2.10.13, 23.0.12.8, 24.0.12.5, 25.0.9, 26.0.4, and 27.0.1 contain a patch for this issue. No known workarounds are available.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

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Affected Vendor

nextcloud

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Affected Software

security-advisories

Vulnerable Versions:

>= 22.0.0, < 22.2.10.13, >= 23.0.0, < 23.0.12.8, >= 24.0.0, < 24.0.12.5, >= 25.0.0, < 25.0.9, >= 26.0.0, < 26.0.4, >= 27.0.0, < 27.0.1

Timeline

Official Publish: August 10th, 2023

Last Modified: October 10th, 2024

Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N

Weaknesses (CWE)

MITRE ATT&CK TTPs

T1110 Brute Force

Credential Access

T1078 Valid Accounts

T1550 Use Alternate Authentication Material

Defense Evasion

T1021 Remote Services

Lateral Movement

T1562 Impair Defenses

Defense Evasion