EUVD-2026-42790
GHSA-xp53-g87w-p23f
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Unauthenticated network-reachable upload endpoint (AV:N/AC:L/PR:N/UI:N) yielding webshell RCE gives full C/I/A impact; scope unchanged as code runs within the web server context.
Primary rating from Vendor (wordfence).
CVSS VectorVendor: wordfence
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
The 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.
Articles & Coverage 1
AnalysisAI
Unauthenticated arbitrary file upload in the Instant Appointment WordPress plugin (all versions ≤ 1.2) lets remote attackers upload files of any type through the 'insapp_upload_image_as_attachment' function, which lacks file-type validation, potentially enabling remote code execution by planting a PHP webshell. Any WordPress site running the plugin is exploitable without authentication or user interaction, matching its 9.8 CVSS rating. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The only prerequisite is that the target WordPress site has the Instant Appointment plugin (version ≤ 1.2) installed and active, exposing the 'insapp_upload_image_as_attachment' AJAX endpoint. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | All exploitation signals point to genuinely high priority. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An unauthenticated attacker locates a WordPress site running Instant Appointment and sends a crafted multipart POST to the plugin's admin-ajax upload action, submitting a PHP webshell instead of an image. Because 'insapp_upload_image_as_attachment' does not validate file type, the shell is written into the uploads directory; the attacker then requests that file's URL directly to execute commands on the server. … |
| Remediation | No vendor-released patch identified at time of analysis - the input shows all versions through 1.2 as vulnerable with no fixed release. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify and inventory all WordPress installations running Instant Appointment plugin version 1.2 or earlier; immediately deactivate and remove the plugin from all production sites. …
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