CVE-2025-52576 json
Kanboard vulnerable to Username Enumeration via Login Behavior and Bruteforce Protection Bypass
published 2025-06-25 16 mo ago modified 2026-06-17 4 mo ago also EUVD-2025-19116
- cvss
- 5.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 29%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 16 mo ago
Exploit prediction
0.36% chance of exploitation in the next 30 days, higher than 29% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/kanboard/kanboard/security/advisories/GHSA-qw57-7cx6-wvp7 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
| NVD | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
Affected products
- kanboard kanboard
Classification
- Weakness
-
- CWE-203 Observable Discrepancy
References
-
github.com
/kanboard/kanboard/commit/3079623640dc39f9c7b0c840d2a79095331051f1
patch
-
github.com
/kanboard/kanboard/security/advisories/GHSA-qw57-7cx6-wvp7
exploit, vendor-advisory
-
github.com
/kanboard/kanboard/blob/cbb7e60fb595ff4572bb8801b275a0b451c4bda0/app/Model/UserLockingModel.php#L101-L104
product
-
github.com
/kanboard/kanboard/blob/cbb7e60fb595ff4572bb8801b275a0b451c4bda0/app/Subscriber/AuthSubscriber.php#L96-L108
product
Sources
- CVE List CVE-2025-52576
- NVD CVE-2025-52576
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.