CVE-2026-30913 flarum/nickname: Display name injection in notification emails (autolink & markdown)

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...

CVE-2026-30913

The CVE concerns Flarum with the nicknames extension enabled. A user’s nickname is inserted verbatim into plain‑text notification emails, allowing email clients to render it as a hyperlink. This can mislead recipients into visiting attacker‑controlled domains. The issue is tied to nickname handli...