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CVE-2026-49772 – Unauthenticated Blind SQL Injection – The Events Calendar WordPress Plugin (vers…

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Summary

CVE-2026-49772 is a critical Blind SQL Injection vulnerability in The Events Calendar WordPress plugin by Liquid Web / StellarWP, affecting versions 6.15.12 through 6.16.2. Rated CVSS 9.3 (Critical), the flaw allows any unauthenticated remote attacker to inject arbitrary SQL commands and exfiltrate sensitive data from the underlying WordPress database — with no credentials or user interaction required. With over 700,000 active installations, the exposure is exceptionally broad.

Technical details

  • Root cause: Improper neutralization of special elements used in SQL commands (CWE-89) within the plugin’s query handling logic, allowing attacker-controlled input to alter the structure of executed SQL queries.
  • Trigger conditions: No authentication is required. Any anonymous remote user can send a crafted HTTP request to a vulnerable installation to trigger the injection — there is no prerequisite access, privilege, or site-specific configuration needed.
  • Attack vector: Network-accessible (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N) — the full exploit chain is executable by an unauthenticated internet user against any exposed WordPress site running an affected plugin version.
  • Impact: Successful exploitation enables blind SQL injection with a Changed scope (S:C), meaning the attack crosses the security boundary from the plugin context into the broader database. The High confidentiality impact (C:H) allows an attacker to enumerate and exfiltrate arbitrary data from the WordPress database — including usernames, hashed passwords, private post content, and configuration values stored in wp_options. A Low availability impact (A:L) is also present, indicating potential for disruption of database-dependent functionality.

Affected software

  • The Events Calendar WordPress plugin, versions 6.15.12 through 6.16.2 (inclusive)

Severity

  • CVSS v3.1 Base Score: 9.3 (Critical)
  • Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:L

Mitigation and recommended actions

  • Immediate: Update The Events Calendar to version 6.16.3 or later. Version 6.16.4 is the latest available release as of June 15, 2026, and is available directly from the WordPress plugin repository.
  • If immediate patching is not feasible, consider restricting public access to WordPress sites running affected plugin versions as a temporary measure. Given the zero-authentication requirement, unpatched internet-exposed instances should be treated as high-priority remediation targets.

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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1

Map your entire attack surface (continously)

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