critical9.1
CVE-2026-21881
Kanboard is project management software focused on Kanban methodology.
Impact
Kanboard is project management software focused on Kanban methodology. Versions 1.2.48 and below is vulnerable to a critical authentication bypass when REVERSE_PROXY_AUTH is enabled. The application blindly trusts HTTP headers for user authentication without verifying the request originated from a trusted reverse proxy. An attacker can impersonate any user, including administrators, by simply sending a spoofed HTTP header. This issue is fixed in version 1.2.49.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Kanboard | Kanboard | before 1.2.49 |
Weakness classification
References
- NVD record
- CVE.org record
- https://github.com/kanboard/kanboard/commit/7af6143e2ad25b5c15549cca8af4341c7ac4e2fc
- https://github.com/kanboard/kanboard/releases/tag/v1.2.49
- https://github.com/kanboard/kanboard/security/advisories/GHSA-wwpf-3j4p-739w
- https://github.com/kanboard/kanboard/security/advisories/GHSA-wwpf-3j4p-739w