CVE-2026-78213

The 'on click' execution requirement in CVE-2026-78213 is a sanitization fingerprint, not a security feature. It tells you Heptabase neutralized automatic script execution—likely through DOMPurify, Angular's built-in sanitizer, or equivalent—but failed to strip event handler attributes from allowed HTML elements. This is a documented stage in the sanitization-bypass evolutionary tree, seen previously in Notion and Confluence CVEs. The attacker doesn't need to convince anyone to click a suspicious link; in Heptabase, clicking cards, links, and embedded objects IS the product workflow. The 'social engineering barrier' framing overstates what little constraint exists. This has direct operational implications. First, audit your content-rendering paths: exports, shared snapshots, imported markdown, and API-fed content may represent 'shadow content paths' where the same sanitization never ran at all. Attackers will look here before probing your primary rendering layer. Second, understand the blast radius isn't random web traffic—it's anyone whose role requires engaging with shared content: admins reviewing team notes, project leads clicking through cards, auditors interacting with boards. These are higher-value targets than passive viewers, and the click-requirement actually concentrates exposure toward them. Third, and most critically, recognize the breaking-change trap: if Heptabase now removes event handlers to properly remediate, it risks breaking user-authored content already stored in the database. This creates organizational resistance to complete remediation—the same inertia that produced the partial fix in the first place. Your assessment should treat this vulnerability as a content-model migration problem, not a simple patch. Verify whether role-based access controls exist and whether any authenticated workspace member can inject payloads visible to higher-privilege users. If all collaborators are equivalently trusted by the permission model, the attack surface extends further than the CVE's CVSS 8.7 score suggests.

Reviewed through automated stages and approved by a human before publication.