External risk intelligence

Shopo WordPress Theme Arbitrary File Upload Vulnerability.

CVE advisorySeverity: CRITICAL (CVSS 9.9)

CVE-2025-31048

The vulnerability affects a WordPress theme, which is a component of a web application. WordPress sites are frequently deployed as public-facing web services. An arbitrary file upload vulnerability in this context allows for remote code execution via the web server, which is commonly exposed to the internet.

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 has been identified in the Shopo WordPress theme, allowing unauthorized users to upload malicious files to a web server. This could enable an attacker to gain control of the server and potentially impact associated business operations. The primary concern is to confirm if this theme is in use and assess any potential exposure.

Attackers can upload harmful files to servers.
Confirms theme usage and assesses potential exposure.
Understand your Shopo theme's presence and impact.

Attack Path

How an attacker could exploit the issue

An attacker with basic user access to the Shopo-powered website can upload a malicious file. This file can then be executed on the web server, potentially allowing the attacker to take control of the site.

Requires authenticated access.
Triggered by uploading a file.
Leads to server compromise.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability could allow an attacker to upload a web shell to a web server, potentially leading to the compromise of the server. This could occur when a user with limited privileges uploads a specially crafted file, which could then be executed by the web server.

Web server files and code.
Uploading a dangerous file type.
Remote code execution on the server.

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability in Shopo, a WordPress theme, impacts web applications. Application owners and platform teams are likely responsible for addressing this critical issue, starting with identifying all instances of the affected theme, confirming their exposure and business criticality, and then planning remediation.

Theme owners should manage remediation.
Verify theme deployment and reachability.
Plan for risk-based maintenance.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

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Frequently asked questions

What is the Shopo theme and how is it used?

Shopo is a WordPress theme designed to help users build and customize e-commerce storefronts on the WordPress platform. It functions as a collection of templates and stylesheets that dictate the visual layout and user interface of a website. When installed, it integrates with the WordPress core to manage site appearance and content structure.

What does CWE-434 mean regarding CVE-2025-31048?

CWE-434 refers to the Unrestricted Upload of File with Dangerous Type. In the context of CVE-2025-31048, it means the software fails to properly check or limit the types of files users can upload. Because these safeguards are missing, an attacker can upload a malicious script—like a web shell—that the server may mistakenly treat as a legitimate file and execute.

How is this file upload vulnerability triggered?

An attacker triggers this flaw by successfully uploading a specially crafted, dangerous file to the web server through the theme's upload functionality. It is important to note that this requires the attacker to have an authenticated user account with sufficient privileges to interact with these upload features; it cannot be triggered by a completely anonymous visitor.

Is my site at risk if I use Shopo?

Halo Surface Signal classifies this as likely high risk because Shopo is a WordPress theme, which typically powers public-facing websites. If your instance is accessible over the internet, an attacker with basic authenticated access can attempt to use this path to execute code on your server. Internal-only sites still face a risk if compromised credentials are used to access the theme.

What should I do to secure my environment?

Begin by auditing your WordPress installations to confirm if the Shopo theme is active and identify which users have permission to upload files. Check for any unusual file activity on your web server and prioritize moving to a newer, patched version of the theme if one is available. If you cannot update immediately, consider disabling the affected theme functionality or restricting upload privileges until you can apply a fix.

References

patchstack.com/database/wordpress/theme/shopo/vulnerability/wordpres…

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.