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Vulnerability · Published Jun 25, 2025 · Assigned by GitHub_M

CVE-2025-52576Kanboard vulnerable to Username Enumeration via Login Behavior and Bruteforce Protection Bypass

Medium 5.3

In plain English

A medium-severity security flaw in kanboard from kanboard. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 29% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.4%top 70.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

Kanboard is project management software that focuses on the Kanban methodology. Prior to version 1.2.46, Kanboard is vulnerable to username enumeration and IP spoofing-based brute-force protection bypass. By analyzing login behavior and abusing trusted HTTP headers, an attacker can determine valid usernames and circumvent rate-limiting or blocking mechanisms. Any organization running a publicly accessible Kanboard instance is affected, especially if relying on IP-based protections like Fail2Ban or CAPTCHA for login rate-limiting. Attackers with access to the login page can exploit this flaw to enumerate valid usernames and bypass IP-based blocking mechanisms, putting all user accounts at higher risk of brute-force or credential stuffing attacks. Version 1.2.46 contains a patch for the issue.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:14kanboard1.2.47+ds-1DEBIAN-CVE-2025-52576

Affected products (as reported)

VendorProductVersions
kanboard kanboard < 1.2.46

Weakness: CWE-203 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References