{"id":"CVE-2026-34720","summary":"Zammad has an origin validation error in SSO mechanism","details":"Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1 and 6.5.4, the SSO mechanism in Zammad was not verifying the header originates from a trusted SSO proxy/gateway before applying further actions on it. This vulnerability is fixed in 7.0.1 and 6.5.4.","aliases":["GHSA-hcv6-w4h9-p2p7"],"modified":"2026-07-27T03:56:20.785008673Z","published":"2026-04-08T18:11:23.538Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-346"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34720.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34720.json"},{"type":"ADVISORY","url":"https://github.com/zammad/zammad/security/advisories/GHSA-hcv6-w4h9-p2p7"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-34720"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/zammad/zammad","events":[{"introduced":"0"},{"fixed":"15c7e6d4ffd95c84535d334b7c0ce0bc2fbc5228"},{"introduced":"f3228274c4feefac470d7efad12f240debd678bc"},{"last_affected":"f3228274c4feefac470d7efad12f240debd678bc"}],"database_specific":{"cpe":["cpe:2.3:a:zammad:zammad:*:*:*:*:*:*:*:*","cpe:2.3:a:zammad:zammad:7.0.0:*:*:*:*:*:*:*"],"extracted_events":[{"introduced":"0"},{"fixed":"6.5.4"},{"introduced":"7.0.0"},{"last_affected":"7.0.0"}],"source":["CPE_RANGE","CPE_STRING"]}}],"versions":["7.0.0","6.5.3","6.5.2","6.5.1","6.5.0","6.5.0-alpha","6.4.0-alpha","6.3.0-alpha","6.2.0-alpha","6.1.0-alpha","6.0.0-alpha","5.5.0-alpha","5.4.0-alpha","5.3.0-alpha","5.2.0-alpha","3.7.0","1.6.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-34720.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"}]}