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CVE-2026-9711 – Unauthenticated SQL Injection – EventON WordPress Virtual Event Calendar Plugin ≤…

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Summary

CVE-2026-9711 is a critical unauthenticated SQL Injection vulnerability in the EventON (Pro) – WordPress Virtual Event Calendar Plugin, affecting all versions up to and including 5.0.11. The flaw arises from insufficient input escaping and the absence of prepared statements in the plugin’s search query handling, and carries a CVSS v3.1 base score of 9.8 (Critical). No vendor patch has been released at the time of publication; operators should apply the available configuration-level workaround immediately.

Technical details

  • Root cause: The search WordPress query parameter is passed directly into SQL queries without proper escaping or parameterisation (CWE-89: Improper Neutralization of Special Elements used in an SQL Command), allowing an attacker to append arbitrary SQL statements to existing queries.
  • Trigger conditions: The vulnerability is exploitable when the plugin setting "Enable additional search queries" is active and at least one published event exists on the site.
  • Attack vector: Network-accessible; requires no authentication, no user interaction, and no elevated privileges (AV:N/AC:L/PR:N/UI:N).
  • Impact: Successful exploitation allows unauthenticated remote attackers to extract arbitrary data from the WordPress database, including user credentials, session tokens, and any other sensitive records stored in the database (Confidentiality: High / Integrity: High / Availability: High).

Affected software

  • EventON (Pro) – WordPress Virtual Event Calendar Plugin, all versions up to and including 5.0.11

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical)
  • Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • No patch available at time of publication. Monitor the official EventON changelog and apply any security update as soon as one is released.
  • Immediate workaround: Disable the "Enable additional search queries" setting within the EventON plugin configuration. This removes the prerequisite condition required for exploitation.
  • Apply web application firewall (WAF) rules to inspect and block SQL injection patterns in the search parameter on affected endpoints until a vendor patch is available.
  • Restrict public access to event search functionality at the network or reverse-proxy level if it is not required for site operation.

IONIX Status

The IONIX research team is tracking ongoing exploitation attempts and recommends immediate patching. Potentially affected assets are outlined in this post.

References

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