CVE-2026-21879

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Source
https://cve.org/CVERecord?id=CVE-2026-21879
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-21879.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-21879
Aliases
  • GHSA-mhv9-7m9w-7hcq
Downstream
Published
2026-01-08T00:51:50Z
Modified
2026-10-21T02:30:18Z
Severity
  • 4.7 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N CVSS Calculator
Summary
Kanboard vulnerable to Open Redirect via protocol-relative URLs
Details

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.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-601"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/21xxx/CVE-2026-21879.json"
}
References

Affected packages

Git / github.com/kanboard/kanboard

Affected ranges

Type
GIT
Repo
https://github.com/kanboard/kanboard
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
f0f7d27007f5a788f14416c548421efd740b7bce
Fixed
93bcae03301a6d34185a8dba977417e6b3de519f
Database specific
Show details 
{
    "extracted_events":  [
        {
            "cpe":  "cpe:2.3:a:kanboard:kanboard:*:*:*:*:*:*:*:*",
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "1.2.49"
                }
            ],
            "source":  "CPE_RANGE"
        },
        {
            "range":  [
                {
                    "fixed":  "93bcae03301a6d34185a8dba977417e6b3de519f"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "original_tag":  "v1.2.49",
            "range":  [
                {
                    "fixed":  "f0f7d27007f5a788f14416c548421efd740b7bce"
                }
            ],
            "source":  "REFERENCES_TAG"
        }
    ]
}

Affected versions

v1.*
v1.0.0
v1.0.1
v1.0.10
v1.0.11
v1.0.12
v1.0.13
v1.0.14
v1.0.15
v1.0.16
v1.0.17
v1.0.18
v1.0.19
v1.0.2
v1.0.20
v1.0.26
v1.0.27
v1.0.28
v1.0.29
v1.0.3
v1.0.30
v1.0.31
v1.0.32
v1.0.33
v1.0.34
v1.0.35
v1.0.36
v1.0.37
v1.0.38
v1.0.39
v1.0.4
v1.0.40
v1.0.41
v1.0.42
v1.0.43
v1.0.44
v1.0.45
v1.0.46
v1.0.48
v1.0.5
v1.0.6
v1.0.7
v1.0.8
v1.0.9
v1.1.0
v1.1.1
v1.2.0
v1.2.1
v1.2.10
v1.2.11
v1.2.12
v1.2.13
v1.2.14
v1.2.15
v1.2.16
v1.2.17
v1.2.18
v1.2.19
v1.2.2
v1.2.20
v1.2.21
v1.2.22
v1.2.23
v1.2.24
v1.2.25
v1.2.26
v1.2.27
v1.2.28
v1.2.29
v1.2.3
v1.2.30
v1.2.31
v1.2.32
v1.2.33
v1.2.34
v1.2.35
v1.2.36
v1.2.37
v1.2.38
v1.2.39
v1.2.4
v1.2.40
v1.2.41
v1.2.42
v1.2.43
v1.2.44
v1.2.45
v1.2.46
v1.2.47
v1.2.5
v1.2.6
v1.2.7
v1.2.8
v1.2.9

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-21879.json"