CVE-2026-15282
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 Instant Appointment plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the 'insapp_upload_image_as_attachment' function in all versions up to, and including, 1.2. This makes it possible for unauthenticated attackers to upload arbitrary files on the affected site's server which may make remote code execution possible.
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 Instant Appointment WordPress plugin has an arbitrary file upload vulnerability in the 'insapp_upload_image_as_attachment' function. The function lacks proper file type validation, allowing unauthenticated attackers to upload any file type to the server, which can be leveraged for 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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Identify if Instant Appointment plugin is installedCheck the WordPress plugins directory or access wp-admin/plugins.php to list installed plugins. Look for 'Instant Appointment' in the plugins list.Affected if The plugin named 'Instant Appointment' or similar is found installed on the WordPress site
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Check the installed plugin versionIn WordPress admin, go to Plugins > Installed Plugins > find Instant Appointment and view the version number displayed below the plugin name. Alternatively, check the plugin main PHP file header for the 'Version' tag.Affected if The version number is 1.2 or lower (the vulnerability affects versions up to and including 1.2)
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Locate the insapp_upload_image_as_attachment functionAccess the plugin files via FTP or file manager. Search for the function 'insapp_upload_image_as_attachment' in the plugin PHP files, typically in the main plugin file or an includes/upload file.Affected if The function exists in the plugin code (indicating the vulnerable code is present)
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Inspect the function for file type validationOpen the file containing insapp_upload_image_as_attachment and examine the function code. Look for validation checks such as mime type verification, file extension filtering, or wp_check_filetype calls.Affected if The function contains NO file type or extension validation checks before processing uploads, or validation is easily bypassed
A site is affected if the Instant Appointment plugin is installed with version 1.2 or lower AND the insapp_upload_image_as_attachment function lacks proper file type validation, allowing unauthenticated arbitrary file uploads.
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 plugin to a patched version once available, or disable the plugin until a fix can be applied. As a temporary measure, consider blocking upload endpoints at the web server level or implementing WAF rules to restrict file upload types.
- Consultation3.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2026-15282 — 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-2026-15282 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