CVE-2023-39310
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 · uneditedMissing Authorization vulnerability in ThemeFusion Fusion Builder.This issue affects Fusion Builder: from n/a through 3.11.1.
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 analysis · moderate confidenceA missing authorization vulnerability in ThemeFusion Fusion Builder allows unauthenticated or unauthorized users to perform actions they should not have access to. The specific affected functionality and exploitation details are not fully disclosed in available sources, but such vulnerabilities in page builder plugins typically involve unauthorized modification of page content, layouts, or plugin settings.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
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
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- Low
- Availability
- Low
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Verify Fusion Builder is presentCheck for Fusion Builder files in the WordPress installation. Look for fusion-builder.php or class FusionBuilder.php in either the plugins directory (wp-content/plugins/fusion-builder/) or within the active theme (commonly bundled with Avada theme under includes/builder/)Affected if Fusion Builder files exist in the installation
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Determine the installed Fusion Builder versionRead the version from the plugin header in fusion-builder.php, or check the theme version if Fusion Builder is bundled with Avada. The version is typically defined in a $version variable or Plugin Name header comment at the top of the main plugin fileAffected if Version is lower than 3.11.2 (the fixed release)
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Confirm the builder is activeCheck if Fusion Builder is enabled in WordPress. If bundled with Avada theme, verify the theme is active and the builder functionality is accessible. Check WordPress plugins page or inspect whether the builder shortcodes ([fusion_builder]) are processed on the frontendAffected if Fusion Builder is active and version is below 3.11.2
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Audit public-facing builder endpointsIdentify and test Fusion Builder AJAX actions or REST API endpoints that handle content modifications. Common endpoints include wp-admin/admin-ajax.php with fusion_ prefixed actions. Attempt unauthenticated requests to these endpoints to verify if authorization checks are enforcedAffected if Unauthenticated or unauthorized users can access builder modification endpoints without being blocked
A user is affected if Fusion Builder is installed and active with a version earlier than 3.11.2 and the vulnerable authorization gaps are exploitable by unauthenticated requests.
Generated from the published advisory. Verify against your own configuration.
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 dataUpgrade Fusion Builder to version 3.11.2 or later. If patching is not immediately possible, review server-side access controls and ensure no sensitive Fusion Builder endpoints are exposed to unauthenticated users.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-39310 — 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 sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2023-39310 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
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- 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
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