CVE-2026-21879— Kanboard vulnerable to Open Redirect via protocol-relative URLs
Quick assessment
Affected
kanboard kanboard
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Kanboard是Kanboard开源的一套开源的可视化任务板软件。该软件能够根据业务定制面板。 Kanboard 1.2.48及之前版本存在安全漏洞，该漏洞源于Open Redirect攻击，可能导致用户被重定向至恶意网站。
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I. Basic Information for CVE-2026-21879
Vulnerability Information
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Vulnerability Title
Kanboard vulnerable to Open Redirect via protocol-relative URLs
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
指向未可信站点的URL重定向(开放重定向)
Source: CVE Program / CVE List V5
Vulnerability Title
Kanboard 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Kanboard是Kanboard开源的一套开源的可视化任务板软件。该软件能够根据业务定制面板。 Kanboard 1.2.48及之前版本存在安全漏洞，该漏洞源于Open Redirect攻击，可能导致用户被重定向至恶意网站。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-21879
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Patches & Fixes for CVE-2026-21879 (1)
Vendor Advisories for CVE-2026-21879 (1)
-
https://github.com/kanboard/kanboard/security/advisories/GHSA-mhv9-7m9w-7hcq x_refsource_CONFIRM
Other References for CVE-2026-21879 (1)
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https://github.com/kanboard/kanboard/releases/tag/v1.2.49 x_refsource_MISC
Same Patch Batch · kanboard · 2026-01-08 · 3 CVEs total
| CVE-2026-21881 | 9.1 CRITICAL | Kanboard is Vulnerable to Reverse Proxy Authentication Bypass |
| CVE-2026-21880 | 5.3 MEDIUM | Kanboard LDAP Injection Vulnerability can Lead to User Enumeration and Information Disclos |
IV. Related Vulnerabilities
Same product: kanboard
-
CVE-2026-57862
Kanboard 1.2.52 and prior SSRF Filter Bypass via Hexadecimal -
CVE-2026-58660
Kanboard BoardAjaxController Missing Ownership Check via Dra -
CVE-2026-56774
Kanboard - Cross-User Deletion of Persistent Login Sessions -
CVE-2026-33058
Kanboard has Authenticated SQL Injection in Project Permissi -
CVE-2026-29056
Kanboard's privilege escalation via mass assignment in user
Same vendor: kanboard
-
CVE-2026-57862
Kanboard 1.2.52 and prior SSRF Filter Bypass via Hexadecimal -
CVE-2026-58660
Kanboard BoardAjaxController Missing Ownership Check via Dra -
CVE-2026-56774
Kanboard - Cross-User Deletion of Persistent Login Sessions -
CVE-2026-33058
Kanboard has Authenticated SQL Injection in Project Permissi -
CVE-2026-29056
Kanboard's privilege escalation via mass assignment in user
V. Comments for CVE-2026-21879
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