{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-21879",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-01-05T17:24:36.928Z",
        "datePublished": "2026-01-08T00:51:50.954Z",
        "dateUpdated": "2026-01-08T18:34:42.665Z"
    },
    "containers": {
        "cna": {
            "title": "Kanboard vulnerable to Open Redirect via protocol-relative URLs",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-601",
                            "lang": "en",
                            "description": "CWE-601: URL Redirection to Untrusted Site ('Open Redirect')",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "attackComplexity": "LOW",
                        "attackVector": "NETWORK",
                        "availabilityImpact": "NONE",
                        "baseScore": 4.7,
                        "baseSeverity": "MEDIUM",
                        "confidentialityImpact": "LOW",
                        "integrityImpact": "NONE",
                        "privilegesRequired": "NONE",
                        "scope": "CHANGED",
                        "userInteraction": "REQUIRED",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N",
                        "version": "3.1"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/kanboard/kanboard/security/advisories/GHSA-mhv9-7m9w-7hcq",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/kanboard/kanboard/security/advisories/GHSA-mhv9-7m9w-7hcq"
                },
                {
                    "name": "https://github.com/kanboard/kanboard/commit/93bcae03301a6d34185a8dba977417e6b3de519f",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/kanboard/kanboard/commit/93bcae03301a6d34185a8dba977417e6b3de519f"
                },
                {
                    "name": "https://github.com/kanboard/kanboard/releases/tag/v1.2.49",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/kanboard/kanboard/releases/tag/v1.2.49"
                }
            ],
            "affected": [
                {
                    "vendor": "kanboard",
                    "product": "kanboard",
                    "versions": [
                        {
                            "version": "< 1.2.49",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-01-08T00:51:50.954Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "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": {
                "advisory": "GHSA-mhv9-7m9w-7hcq",
                "discovery": "UNKNOWN"
            }
        },
        "adp": [
            {
                "references": [
                    {
                        "url": "https://github.com/kanboard/kanboard/security/advisories/GHSA-mhv9-7m9w-7hcq",
                        "tags": [
                            "exploit"
                        ]
                    }
                ],
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-01-08T18:34:32.575700Z",
                                "id": "CVE-2026-21879",
                                "options": [
                                    {
                                        "Exploitation": "poc"
                                    },
                                    {
                                        "Automatable": "no"
                                    },
                                    {
                                        "Technical Impact": "partial"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-01-08T18:34:42.665Z"
                }
            }
        ]
    }
}