External risk intelligence

WineShop PHP Object Injection Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2026-62090

The vulnerability affects a WordPress theme, which is a component of a web application. Web applications and their associated themes are commonly deployed as internet-facing services to facilitate public access to website content, making this component likely to be reachable from the internet in common deployment patterns.

Deserialization

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 security flaw has been identified in the WineShop software, specifically related to how it handles data inputs. This vulnerability could potentially allow unauthorized access and manipulation of the system, impacting its integrity and availability. The main concern is to determine if our organization utilizes this specific software and, if so, to assess the potential exposure.

Unauthenticated code injection in software.
Potential for unauthorized system access.
Confirm relevance and assess any exposure.

Attack Path

How an attacker could exploit the issue

An unauthenticated attacker could exploit this vulnerability by sending a specially crafted request to a vulnerable WineShop installation. This could lead to the execution of arbitrary code on the server.

No authentication required.
Triggered by sending malicious input.
Leads to code execution.

Live Threat

Current exploitation, exposure, and threat context

Unauthenticated PHP Object Injection in WineShop could allow an attacker to execute arbitrary code on the server when supported by the advisory. This could affect the integrity and availability of the WineShop application and its underlying system.

Server-side code execution.
Via unauthenticated user input.
Application compromise and data corruption.

Operational Fix

Recommended remediation, mitigation, and detection steps

This unauthenticated PHP Object Injection vulnerability in WineShop affects internet-facing web applications. The first step is to identify all instances of this theme, determine their business criticality and network exposure, and locate the accountable application or platform owners. Subsequent remediation planning should be risk-based.

Application or platform owners should take the lead.
Verify theme installations and network reachability.
Plan remediation or mitigation based on risk.

Supplementary metadata

CVSS vector

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.

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Frequently asked questions

What is WineShop software?

WineShop is a theme designed for the WordPress content management system. It provides the visual layout, styling, and design elements for websites, typically used by businesses to manage online store content. Like other WordPress themes, it integrates directly with the site's PHP-based backend to render pages for visitors.

What does PHP Object Injection mean for CVE-2026-62090?

This vulnerability falls under the CWE-502 weakness class, which happens when an application takes untrusted, user-provided data and deserializes it without proper validation. In the context of CVE-2026-62090, the software inadvertently processes malicious input as if it were a legitimate program instruction, potentially allowing an attacker to manipulate application logic or execute unauthorized commands.

How is this vulnerability triggered?

An attacker triggers this flaw by sending a specifically crafted request containing malicious data to the WineShop installation. Because the application fails to verify the input before processing, it accepts the payload automatically. Note that simply browsing the website or clicking normal links does not trigger the bug; it requires a targeted, crafted interaction designed to exploit the deserialization process.

Is my instance of WineShop at risk?

If you are running WineShop version 3.20 or older, you are affected. According to Halo Surface Signal, this vulnerability is considered a likely concern because WordPress themes are typically used to power internet-facing web applications. If your WineShop site is accessible to the public on the internet, it is reachable by external parties who could attempt to send the malicious requests needed to exploit this flaw.

What should I do if I use WineShop?

Your first step is to perform an internal inventory to locate every instance of the WineShop theme within your environment. Once identified, work with the owners of those specific applications to verify if they are internet-facing. After assessing the business criticality of each site, prioritize these instances for remediation, such as applying vendor-supplied updates or disabling the theme if a patch is not yet available.

References

patchstack.com/database/wordpress/theme/wineshop/vulnerability/wordp…

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.