Account enumeration and brute-force bypass via login handling
Published Jun 25, 2025 · Updated Jun 25, 2025
Username enumeration in Kanboard before 1.2.46 allows remote attackers to identify valid accounts through login-response differences. AuthController records failures and shows CAPTCHA or account-lock behavior only when the submitted username exists, while Request::getIpAddress trusts client-supplied forwarding headers. Unauthenticated access to the login page permits account discovery and spoofed source addresses that defeat CAPTCHA and IP-based brute-force controls.
Summary
What happened
Username enumeration in Kanboard before 1.2.46 allows remote attackers to identify valid accounts through login-response differences. AuthController records failures and shows CAPTCHA or account-lock behavior only when the submitted username exists, while Request::getIpAddress trusts client-supplied forwarding headers. Unauthenticated access to the login page permits account discovery and spoofed source addresses that defeat CAPTCHA and IP-based brute-force controls.
The record
- CVE
- CVE-2025-52576
- Published
- Jun 25, 2025
- Updated
- Jun 25, 2025
- Vendor
- Kanboard
- Product
- Kanboard
- Classifications
- CWE-203, T1110.001
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 25, 2025CVE publishedPublication date reported by the CVE source.
- Jun 25, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 1.2.46
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
- Upstream username-enumeration and IP-spoofing proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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