{"id":"CVE-2026-21879","state":"PUBLISHED","title":"Kanboard vulnerable to Open Redirect via protocol-relative URLs","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($url, FILTER_VALIDATE_URL) validation check. This vulnerability could be exploited to conduct phishing attacks, steal user credentials, or distribute malware. The issue is fixed in version 1.2.49.","publishedAt":"2026-01-08T00:51:50.954Z","updatedAt":"2026-01-08T18:34:42.665Z","severity":{"score":4.7,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["kanboard kanboard"],"affected":[{"vendor":"kanboard","product":"kanboard","versions":[{"version":"< 1.2.49","status":"affected"}]}],"references":["https://github.com/kanboard/kanboard/security/advisories/GHSA-mhv9-7m9w-7hcq","https://github.com/kanboard/kanboard/commit/93bcae03301a6d34185a8dba977417e6b3de519f","https://github.com/kanboard/kanboard/releases/tag/v1.2.49"],"weaknesses":["CWE-601"],"ingestedAt":"2026-10-29T20:11:10.572Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/21xxx/CVE-2026-21879.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-21879","state":"PUBLISHED","datePublished":"2026-01-08T00:51:50.954Z","dateUpdated":"2026-01-08T18:34:42.665Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-01-05T17:24:36.928Z"},"containers":{"cna":{"title":"Kanboard vulnerable to Open Redirect via protocol-relative URLs","descriptions":[{"lang":"en","value":"Kanboard is project management software focused on Kanban methodology. Versions 1.2.48 and below are vulnerable to an Open Redirect attack that allows malicious actors to redirect authenticated users to attacker-controlled websites. By crafting URLs such as //evil.com, attackers can bypass the filter_var($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."}],"affected":[{"vendor":"kanboard","product":"kanboard","versions":[{"version":"< 1.2.49","status":"affected"}]}],"references":[{"url":"https://github.com/kanboard/kanboard/security/advisories/GHSA-mhv9-7m9w-7hcq","name":"https://github.com/kanboard/kanboard/security/advisories/GHSA-mhv9-7m9w-7hcq","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/kanboard/kanboard/commit/93bcae03301a6d34185a8dba977417e6b3de519f","name":"https://github.com/kanboard/kanboard/commit/93bcae03301a6d34185a8dba977417e6b3de519f","tags":["x_refsource_MISC"]},{"url":"https://github.com/kanboard/kanboard/releases/tag/v1.2.49","name":"https://github.com/kanboard/kanboard/releases/tag/v1.2.49","tags":["x_refsource_MISC"]}],"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-601","lang":"en","description":"CWE-601: URL Redirection to Untrusted Site ('Open Redirect')","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-01-08T00:51:50.954Z"},"source":{"advisory":"GHSA-mhv9-7m9w-7hcq","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","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"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-01-08T18:34:42.665Z"}}]}}}