External risk intelligence

Tickera Tickera Event Ticketing System Blind SQL Injection Vulnerability.

CVE advisorySeverity: CRITICAL (CVSS 9.3)

CVE-2026-105889

The vulnerability affects a WordPress plugin designed for event ticketing. Such plugins are typically installed on web servers to provide public-facing booking and ticketing functionality, making the vulnerable endpoints commonly accessible over the internet as part of standard website operations.

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 the Tickera event ticketing system, potentially allowing attackers to execute unauthorized commands. This issue impacts systems using the Tickera software. The primary concern is to confirm if this specific technology is in use and assess any resulting exposure.

Allows unauthorized command execution.
Confirms use of ticketing software.
Assess relevance and exposure.

Attack Path

How an attacker could exploit the issue

An attacker could exploit this vulnerability by sending specially crafted input to the affected Tickera ticketing system. This input would target a flaw in how the system handles SQL commands, allowing the attacker to inject malicious SQL code. If successful, this could lead to unauthorized access to sensitive data or even system disruption.

No authentication or privileges needed.
Malicious input to SQL command processing.
Data exposure and potential system disruption.

Live Threat

Current exploitation, exposure, and threat context

A Blind SQL Injection vulnerability exists in Tickera's event ticketing system that could allow an attacker to infer information from the database. This could occur when the system processes specially crafted input that is not properly neutralized, potentially leading to unauthorized data disclosure when supported by the advisory.

Database information could be exposed.
Through specially crafted input.
Information disclosure from the database.

Operational Fix

Recommended remediation, mitigation, and detection steps

Real-World Ownership

This critical SQL injection vulnerability in Tickera's event ticketing system likely impacts website owners and their technical support teams. The first practical step is to identify all instances of this ticketing system, determine their internet reachability and business criticality, and then locate the accountable owner for remediation planning.

Application and infrastructure teams should own.
Verify internet-facing Tickera installations.
Plan remediation based on confirmed exposure.

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 the Tickera Event Ticketing System?

Tickera is a WordPress plugin used to manage event ticketing and registration. It allows website administrators to create tickets, manage bookings, and handle attendee information directly within their WordPress environment.

How does this SQL injection vulnerability work in CVE-2026-105889?

This flaw, classified as CWE-89, happens when the plugin fails to properly clean user-provided input before using it in database queries. Because it is a Blind SQL Injection, an attacker cannot see the data directly, but they can send specific requests to ask the database true-or-false questions to slowly piece together sensitive information.

Do I need to be logged into the website for this to be triggered?

No. The vulnerability does not require the attacker to have an account, special privileges, or any form of authentication. It is triggered by simply sending specially crafted web requests to the affected system; standard site interactions that do not involve malformed input will not trigger the vulnerability.

Is my website at high risk if I use this plugin?

According to Halo Surface Signal, this plugin is designed for public-facing event booking, meaning the vulnerable parts are often reachable over the internet. If your installation is internet-facing, it is accessible to anyone online, which increases the likelihood that it could be targeted.

How should I respond to CVE-2026-105889?

Your first step is to verify if you are running a version of the Tickera plugin between n/a and 3.6.0.6. Once confirmed, inventory these installations, evaluate their business importance, and coordinate with your technical team to prioritize and apply the necessary security updates provided by the vendor.

References

patchstack.com/database/wordpress/plugin/tickera-event-ticketing-sys…

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.