CVE-2026-1306
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 · uneditedThe midi-Synth plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type and file extension validation in the 'export' AJAX action in all versions up to, and including, 1.1.0. This makes it possible for unauthenticated attackers to upload arbitrary files on the affected site's server which may make remote code execution possible granted the attacker can obtain a valid nonce. The nonce is exposed in frontend JavaScript making it trivially accessible to unauthenticated attackers.
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 · high confidenceThe midi-Synth WordPress plugin lacks file type and extension validation in its 'export' AJAX action (versions up to 1.1.0). Combined with an exposed nonce in frontend JavaScript accessible to unauthenticated users, this allows attackers to upload arbitrary files leading to potential remote code execution.
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
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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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Confirm midi-Synth plugin is installedNavigate to WordPress admin plugins page or inspect the /wp-content/plugins/ directory for a folder named 'midi-synth' or similar variantAffected if The plugin folder exists in the WordPress plugins directory
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Identify installed plugin versionOpen the main plugin file (usually named midi-synth.php or index.php inside the plugin folder) and locate the version comment or headerAffected if The version is 1.1.0 or any earlier version up to and including 1.1.0
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Verify the export AJAX action existsCheck the plugin source code for registered AJAX handlers related to 'export' functionality (look for add_action('wp_ajax_...') or wp_ajax_nopriv_... hooks with 'export' in the hook name)Affected if An AJAX action handler for 'export' is registered and accessible without authentication (wp_ajax_nopriv_)
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Check for exposed nonce in frontend JavaScriptView page source of any public page on the site and search for the plugin's JavaScript files; inspect them for a hardcoded nonce value that should not be visible to unauthenticated usersAffected if A nonce value is present in client-side JavaScript accessible to unauthenticated visitors
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Verify file upload capability in export actionReview the plugin code handling the export AJAX request to confirm it accepts file uploads without proper file type or extension validationAffected if The export handler accepts file data and writes it to disk without validating file extensions or MIME types
A user is affected if the midi-Synth plugin version is 1.1.0 or earlier, the export AJAX action is accessible to unauthenticated users, and the plugin writes uploaded files without validating their type or extension.
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 dataUpdate the midi-Synth plugin to the latest version if available; otherwise disable or remove the plugin until a patch is released.
- Consultation2.0 h
- Implementation3.0 h
- Testing2.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,272.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-1306 — 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-2026-1306 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
- No spam, self-promotion, credentials, or personal data