Key points
- CVE-2026-105889 is rated critical with a CVSS score of 9.3.
- The flaw enables blind SQL injection within the Tickera event ticketing system.
- The vulnerability affects all versions of the plugin up to and including 3.6.0.6.
The short version
- The Tickera event ticketing system contains a critical security flaw allowing blind SQL injection.
- National Vulnerability Database records classify the issue as CVE-2026-105889 with a severity of 9.3.
- The vulnerability impacts all plugin versions from initial release through version 3.6.0.6.
The details
The Tickera event ticketing system contains a critical security flaw that allows for blind SQL injection attacks. According to the National Vulnerability Database record for CVE-2026-105889, this vulnerability is rated with a CVSS score of 9.3, placing it in the critical severity category. The weakness is classified under CWE-89, which denotes improper neutralisation of special elements used in an SQL command. This specific type of injection allows attackers to manipulate database queries indirectly, often by observing changes in application behaviour rather than receiving direct data output.
The issue affects the Tickera tickera-event-ticketing-system component specifically. The National Vulnerability Database states that the vulnerability impacts versions from n/a through 3.6.0.6. This means that any installation of the plugin at or below this version number is potentially vulnerable to exploitation. The lack of proper input sanitisation enables malicious actors to inject SQL code, which can lead to unauthorised access to sensitive data stored within the database.
Organisations using this plugin for event management must assess their current version immediately. The critical rating indicates a high likelihood of successful exploitation if the vulnerability is present in a production environment. Blind SQL injection can be particularly difficult to detect, as it does not always result in immediate error messages or visible data leakage on the screen. Attackers can infer database structure and content through subtle differences in response times or page rendering.
The context
SQL injection remains one of the most prevalent web application vulnerabilities. The Common Weakness Enumeration identifies CWE-89 as a significant risk because it bypasses application-level security controls. When special characters are not neutralised correctly, they can alter the logic of the underlying SQL statement. This allows attackers to read, modify, or delete data, execute administrative operations on the database, or even recover the content of files on the database file system.
The Tickera plugin is designed to manage event ticketing, which often involves processing personal data and payment information. A successful exploitation of CVE-2026-105889 could compromise this sensitive information. The vulnerability exists in versions up to 3.6.0.6, suggesting that users who have not updated their software in some time are at risk. The critical CVSS score of 9.3 reflects the severe potential impact on confidentiality, integrity, and availability of the affected systems.
Defender's checklist
Security teams should audit their WordPress installations to identify any instances of the Tickera plugin. They must verify the version number against the affected range of up to 3.6.0.6. If the plugin is present and within this range, it should be considered compromised until proven otherwise. Monitoring database logs for unusual query patterns can help detect ongoing blind SQL injection attempts. Implementing web application firewalls may provide an additional layer of defence against common injection payloads.
What to do and how to stay safe: Tickera
- Audit all WordPress installations to check if the Tickera event ticketing plugin is installed and identify the specific version number.
- Compare the installed version against the affected range up to 3.6.0.6; if it falls within this range, treat the system as vulnerable.
- Monitor server access logs and database query logs for suspicious activity indicative of blind SQL injection attempts, such as unusual time delays.
- Ensure that web application firewalls are configured to detect and block common SQL injection patterns until a verified patch is available from the vendor.
Step-by-step guide: Unpatched Software: Why Missing Updates Create Hidden Entry Points
General security guidance from the Cipher Insider newsroom. It is not confirmed advice from the organisations named in this story.
Frequently asked questions
What is the CVE ID for this Tickera vulnerability?
The vulnerability is identified as CVE-2026-105889 in the National Vulnerability Database records.
Which versions of the Tickera plugin are affected?
All versions of the Tickera event ticketing system from initial release through version 3.6.0.6 are affected.
What type of attack does this vulnerability allow?
The flaw allows for blind SQL injection, which is a form of improper neutralisation of special elements in SQL commands.
