Open Redirect
CVE-2026-21879
MEDIUM
Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N
Lifecycle Timeline
4DescriptionGitHub Advisory
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($url, FILTER_VALIDATE_URL) validation check. This vulnerability could be exploited to conduct phishing attacks, steal user credentials, or distribute malware. The issue is fixed in version 1.2.49.
AnalysisAI
Open redirect vulnerability in Kanboard versions 1.2.48 and below allows attackers to bypass URL validation and redirect authenticated users to malicious websites through specially crafted URLs. Public exploit code exists for this vulnerability, which can be leveraged for phishing attacks and credential theft. The vulnerability is resolved in version 1.2.49.
Technical ContextAI
Classified as CWE-601 (URL Redirection to Untrusted Site (Open Redirect)). Affects Kanboard. Kanboard is project management software focused on Kanban methodology. Versions 1.2.48 and below are vulnerable to an Open Redirect attack that allows malicious actors to redirect authenticated users to attacker-controlled websites. By crafting URLs such as //evil.com, attackers can bypass the filter_var($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 1.2.4
RemediationAI
A vendor patch is available — apply it immediately. Fixed in version 1.2.49.. Restrict network access to the affected service where possible.
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