Platform
wordpress
Component
appointment
Fixed in
3.5.6
A critical Cross-Site Request Forgery (CSRF) vulnerability exists in priyanshumittal Appointment versions 0.0.0 through 3.5.5. This flaw allows an attacker to upload a malicious web shell to the web server, potentially leading to complete system compromise. Immediate action is required to mitigate this risk, prioritizing upgrading to a patched version when available.
The impact of CVE-2026-39620 is severe. Successful exploitation allows an attacker to upload a web shell, granting them remote code execution (RCE) capabilities on the affected web server. This can lead to unauthorized access to sensitive data, modification of system configurations, and complete control over the server. The attacker could then pivot to other systems within the network, leading to widespread data breaches and operational disruption. The ability to upload arbitrary code directly to the server significantly increases the blast radius of this vulnerability.
CVE-2026-39620 was published on 2026-04-08. The vulnerability's CSRF nature means exploitation requires user interaction, but the potential for RCE makes it a high-priority concern. The severity is pending evaluation for inclusion on KEV and EPSS, but the CRITICAL CVSS score suggests a high probability of exploitation. Public proof-of-concept (POC) code is likely to emerge, increasing the risk of widespread attacks.
Exploit Status
EPSS
0.01% (1% percentile)
CVSS Vector
The primary mitigation for CVE-2026-39620 is to upgrade to a patched version of priyanshumittal Appointment as soon as it becomes available. Until a patch is released, implement strict input validation on all file upload functionalities to prevent malicious code from being uploaded. Consider implementing a Content Security Policy (CSP) to restrict the execution of scripts from untrusted sources. Additionally, enable CSRF protection mechanisms, such as synchronizer tokens or double-submit cookies, to prevent unauthorized requests. After upgrading, confirm the fix by attempting a CSRF attack on the upload functionality and verifying that it is blocked.
No known patch available. Please review the vulnerability's details in depth and employ mitigations based on your organization's risk tolerance. It may be best to uninstall the affected software and find a replacement.
Vulnerability analysis and critical alerts directly to your inbox.
CVE-2026-39620 is a critical Cross-Site Request Forgery (CSRF) vulnerability affecting priyanshumittal Appointment versions 0.0.0–3.5.5. It allows attackers to upload a web shell, potentially leading to remote code execution.
If you are using priyanshumittal Appointment version 0.0.0 through 3.5.5, you are potentially affected by this vulnerability. Assess your environment and implement mitigations immediately.
The recommended fix is to upgrade to a patched version of priyanshumittal Appointment as soon as it becomes available. Until then, implement strict input validation and CSRF protection measures.
While there are no confirmed reports of active exploitation at this time, the CRITICAL severity and potential for RCE suggest a high likelihood of exploitation once public POCs become available.
Check the priyanshumittal Appointment website and relevant security mailing lists for official advisories and updates regarding CVE-2026-39620.
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