External risk intelligence

YMC Filter SQL Injection Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.3)

CVE-2026-54836

The vulnerability affects a WordPress plugin, which is a type of web application component commonly deployed on public-facing web servers. SQL injection vulnerabilities in such plugins are typically reachable via the internet through standard web traffic.

SQL Injection

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 SQL injection vulnerability has been identified in YMC Filter, a component that processes user input for SQL commands. This issue could potentially allow unauthorized access to or manipulation of backend data. The main concern at this time is confirming the relevance and exposure of this vulnerability to our specific environment.

Input errors let attackers inject malicious code.
Protects sensitive data from unauthorized access.
Confirm relevance and understand potential exposure.

Attack Path

How an attacker could exploit the issue

An attacker can target the YMC Filter component by sending specially crafted requests over the network. If the filter fails to properly handle these requests, it could allow an attacker to inject malicious SQL commands. This could potentially lead to unauthorized access to or manipulation of data stored in the application's database.

No authentication or special privileges are required.
Sending malicious SQL commands to the filter triggers the vulnerability.
Risk of unauthorized data access and manipulation.

Live Threat

Current exploitation, exposure, and threat context

A SQL injection vulnerability in YMC Filter could allow an attacker to execute arbitrary SQL commands, potentially impacting the integrity and confidentiality of the application's database when supported by the advisory.

Database integrity and confidentiality.
Via crafted network requests to the application.
Unauthorized data access or modification.

Operational Fix

Recommended remediation, mitigation, and detection steps

The "YMC Filter" component is likely part of a web application, possibly a WordPress plugin, managed by application owners or platform teams. Initial actions should focus on identifying all instances of the affected filter, assessing their exposure and criticality, and locating the specific team or individual responsible for its upkeep. This will enable a prioritized remediation plan.

Application owners must address this.
Verify exposure and business impact.
Plan remediation actions and track.

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.

Free EASM Trial See How Signal Works

Frequently asked questions

What is the YMC Filter software?

YMC Filter is a WordPress plugin designed to help site administrators manage and display filtered content. It acts as a component that processes user-submitted queries to fetch specific data from the underlying database, effectively bridging the gap between website visitors and the information stored on the server.

What does SQL injection mean for CVE-2026-54836?

This vulnerability falls under the CWE-89 weakness class. It occurs when software does not correctly clean or sanitize user-supplied input before using it in a database query. Because the application fails to distinguish between intended commands and malicious data, an attacker can supply their own SQL code, forcing the database to execute unauthorized instructions.

How is this vulnerability triggered?

An attacker triggers this bug by sending specially crafted network requests to the plugin. No authentication or elevated user privileges are needed to initiate the attack. Crucially, the vulnerability relies on the plugin processing these malformed inputs; simply visiting the website normally without submitting specifically crafted data will not trigger the vulnerability.

Is my site at risk according to Halo Surface Signal?

Halo Surface Signal labels this as likely relevant because YMC Filter is a web application component. Since such plugins are frequently deployed on public-facing web servers, they are often reachable via standard internet traffic, allowing remote attackers to send the necessary requests to exploit the database weakness.

What should I do if I run YMC Filter?

Your first step is to inventory all instances of the plugin within your environment to understand where it is currently active. Once identified, evaluate the criticality of the data the plugin accesses and coordinate with the relevant application owners. This preparation allows you to plan and prioritize your next steps for mitigation or updates once they are available.

References

patchstack.com/database/wordpress/plugin/ymc-smart-filter/vulnerabil…

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.