# CVE-2026-21879: kanboard: Kanboard is project management software focused on Kanban methodology

CVE-2026-21879 is fixed in kanboard on 1 platform by DEBIAN-CVE-2026-21879 (version 1.2.49+ds-1), released January 8, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-21879
- Priority: Routine
- CVSS: 6.1 (medium)
- EPSS: 0.0031
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jan 8, 2026

## Description

Kanboard is project management software focused on Kanban methodology. Versions 1.2.48 and below are vulnerable to an Open Redirect attack that allows malicious actors to redirect authenticated users to attacker-controlled websites. By crafting URLs such as //evil.com, attackers can bypass the filter_var($url, FILTER_VALIDATE_URL) validation check. This vulnerability could be exploited to conduct phishing attacks, steal user credentials, or distribute malware. The issue is fixed in version 1.2.49.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | kanboard Debian 14 | 1.2.49+ds-1 | [DEBIAN-CVE-2026-21879](https://patchblox.com/security/data/fix/linux/debian-cve-2026-21879.md) | Jan 8, 2026 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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