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NULL CATHEDRAL is a security researcher or research entity publicly associated with disclosure of a Roundcube Webmail privacy bypass vulnerability. The reported issue affected Roundcube’s HTML sanitization logic and enabled remote image loading and email-open tracking despite user settings intended to block remote images. The technique abused SVG handling, specifically an element that was not correctly treated as an external resource loader, allowing attacker-controlled content to trigger outbound requests when an email was rendered. Publicly attributed activity in this context reflects vulnerability research and disclosure rather than an established intrusion set, malware operator, or threat actor conducting offensive campaigns. No high-confidence evidence is available here to attribute broader targeting patterns, operational infrastructure, geographic origin, or criminal or state-sponsored objectives to NULL CATHEDRAL.
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1 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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Every observed MITRE ATT&CK technique, grouped by tactic.
Families this actor is known to deploy, with IOCs and behavior.
CVEs this actor has used in known campaigns.
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