{"id":"CVE-2026-30913","summary":"flarum/nickname: Display name injection in notification emails (autolink & markdown)","details":"Flarum is open-source forum software. When the flarum/nicknames extension is enabled, a registered user can set their nickname to a string that email clients interpret as a hyperlink. The nickname is inserted verbatim into plain-text notification emails, and recipients may be misled into visiting attacker-controlled domains.","aliases":["GHSA-3c4m-j3g4-hh25"],"modified":"2026-04-10T05:42:35.497725Z","published":"2026-03-09T22:42:40.014Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/30xxx/CVE-2026-30913.json","cwe_ids":["CWE-79"],"cna_assigner":"GitHub_M"},"references":[{"type":"WEB","url":"https://github.com/flarum/nicknames/releases/tag/v1.8."},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/30xxx/CVE-2026-30913.json"},{"type":"ADVISORY","url":"https://github.com/flarum/framework/security/advisories/GHSA-3c4m-j3g4-hh25"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-30913"},{"type":"FIX","url":"https://github.com/flarum/nicknames/commit/4dde99729abdce8f6e2a7437c86e38735fdcca28"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/flarum/framework","events":[{"introduced":"0"},{"fixed":"f07336e204aef7876170174865e0b04c0ee7d16d"}],"database_specific":{"versions":[{"introduced":"0"},{"fixed":"1.8.3"}]}}],"versions":["v1.3.0","v1.3.1","v1.4.0","v1.5.0","v1.6.0","v1.6.1","v1.7.0","v1.7.1","v1.8.0","v1.8.1","v1.8.2"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-30913.json"}},{"ranges":[{"type":"GIT","repo":"https://github.com/flarum/nicknames","events":[{"introduced":"0"},{"fixed":"4dde99729abdce8f6e2a7437c86e38735fdcca28"}]}],"versions":["v1.3.0","v1.3.1","v1.4.0","v1.5.0","v1.6.0","v1.6.1","v1.7.0","v1.8.0","v1.8.1","v1.8.2"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-30913.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N"}]}