CVE-2026-78213
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedHeptabase developed by Hepta Platforms, Inc. has a Stored Cross-Site Scripting vulnerability. Authenticated remote attackers can inject persistent malicious content into specific pages, causing arbitrary JavaScript code to execute when other users click the crafted content.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysisUntrusted input is placed into a web page without being neutralised, so an attacker's markup or script executes in another user's browser. That can hijack sessions, capture keystrokes, or silently perform actions as the victim. Fixing it properly means context-aware output encoding everywhere data meets HTML, backed by a content-security policy as a second line of defence.
General guidance for the cross-site scripting (xss) class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →
CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- Low
- User interaction
- Required
- Scope
- Changed
- Confidentiality
- High
- Integrity
- High
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataThere is no version to upgrade to and no patch to apply. Every affected install stays exposed until the vendor ships a fix — or somebody else builds one.
Free. We build fixes in the order the community asks for them — and we’ll tell you the moment this one lands.
We develop and verify an original fix where the vendor hasn’t, from $3,100. Deployed to your staging first — never straight to production.
Scope it with usSee what else the community needs solved on the solutions-needed board.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-78213 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesThe '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.
Practitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-78213 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.
A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data