Improper Restriction of Excessive Authentication Attempts in baserCMS - #VU152765
Published: September 29, 2026
Vulnerability identifier: #VU152765
CSH Severity: High
CVSS v4: 9.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-307
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass two-factor authentication and gain administrator access.
The vulnerability exists due to improper restriction of excessive authentication attempts in the admin 2FA verification endpoints and TwoFactorAuthenticationsService::verify() when submitting repeated 2FA verification codes. A remote attacker can submit unlimited six-digit code guesses to bypass two-factor authentication and gain administrator access.
Two-factor authentication must be enabled, and exploitation requires knowledge of a valid administrator password within the code validity window.
Affected software
baserCMS
Remediation
Install security update from vendor's website.
baserCMS - addressed in versions 5.3.1, 5.4.1