External risk intelligence

KALLYAS Theme Unrestricted File Upload Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.9)

CVE-2025-62016

This vulnerability affects KALLYAS, a WordPress theme. WordPress themes are typically used in public-facing web applications. Since the vulnerability involves unrestricted file uploads within a web-based CMS environment that is commonly exposed to the internet, it is likely to be reachable by external actors in standard deployments.

Unrestricted File Upload

Halo Surface Signal: 4 out of 5 — likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A critical vulnerability exists in the KALLYAS WordPress theme, allowing unauthorized file uploads. This could potentially compromise website integrity and data if exploited.

  • Malicious files can be uploaded to websites.
  • Confirms theme's widespread public exposure.
  • Verify relevance and assess exposure.

Attack Path

How an attacker could exploit the issue

An attacker with limited privileges could upload a dangerous file type to the KALLYAS theme. This could allow them to execute arbitrary code on the server, potentially leading to a complete compromise of the website and its data.

  • Requires authenticated user access.
  • Uploads a file with a dangerous type.
  • Enables arbitrary code execution.

Live Threat

Current exploitation, exposure, and threat context

An authenticated user could upload arbitrary files, including malicious scripts, to the KALLYAS theme. This could lead to the execution of code on the server when supported by the advisory.

  • Server compromise and data theft.
  • Malicious file uploads.
  • Website takeover possible.

Operational Fix

Recommended remediation, mitigation, and detection steps

The vulnerability in KALLYAS themes, specifically concerning unrestricted file uploads, likely falls under the purview of application owners and potentially infrastructure or platform teams responsible for the WordPress environment. The initial focus should be on identifying all instances of the affected theme, confirming their exposure and business criticality, and then assigning ownership for remediation planning.

  • Application owners should track this.
  • Verify theme deployment and exposure.
  • Plan vendor coordination for updates.

Supplementary metadata

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

Frequently asked questions

What is the KALLYAS theme?

KALLYAS is a multi-purpose WordPress theme designed to help users build websites with drag-and-drop page builders and pre-built templates. It acts as a structural layer within a WordPress environment, managing site aesthetics and content layout. Because it resides on the web server, it integrates deeply with WordPress functions to handle incoming user requests and data.

What does CWE-434 mean for CVE-2025-62016?

This vulnerability is classified as Unrestricted Upload of File with Dangerous Type. It means the theme fails to properly validate the file extensions or content types of uploaded files. Consequently, the system might accept a malicious script instead of an expected image or document, allowing that file to be stored on the server's filesystem.

How can an attacker trigger this file upload bug?

An attacker needs authenticated access to the system to initiate the upload. The flaw is not triggered by casual visitors browsing the site; it specifically requires a user account that has permission to interact with the theme's upload features. Once authenticated, the attacker can supply a malicious file that the theme incorrectly processes as a safe, legitimate file.

Is my site at risk according to Halo Surface Signal?

Halo Surface Signal identifies this as a likely risk because KALLYAS is a WordPress theme typically used in public-facing web applications. Since these themes are designed to be reachable via the internet, a file upload vulnerability within that environment provides a direct path for external actors to reach your server infrastructure.

What should I do if I use KALLYAS?

First, verify which versions of KALLYAS are currently installed on your WordPress instances. Once identified, evaluate the business criticality of those sites and monitor for official updates or patches from the vendor to resolve the file validation weakness. Limit user access rights where possible until a formal update is applied to mitigate the risk of unauthorized uploads.

References