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CVE-2026-6854 – Unauthenticated SQL Injection – WordPress My Calendar Plugin ≤ 3.7.8

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Summary

CVE-2026-6854 is a high-severity time-based blind SQL injection vulnerability affecting the My Calendar – Accessible Event Manager WordPress plugin (by joedolson), in all versions up to and including 3.7.8. The flaw can be exploited by unauthenticated remote attackers with no user interaction required, enabling extraction of sensitive data from the underlying WordPress database. It carries a CVSS v3.1 base score of 7.5 (HIGH).

Technical details

  • Root cause: Insufficient escaping of user-supplied input via the mc_auth parameter, combined with a lack of proper SQL query preparation in the plugin’s database handling logic.
  • Trigger conditions: An unauthenticated attacker sends a crafted HTTP request containing a malicious value in the mc_auth parameter; no credentials or user interaction are needed.
  • Attack vector: Fully network-accessible (AV:N), low complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N).
  • Impact: Successful exploitation allows an attacker to append additional SQL statements into existing queries, enabling full extraction of sensitive information — including user credentials, personal data, and configuration details — from the WordPress database. Confidentiality impact is rated HIGH; integrity and availability are not directly affected.

Affected software

  • My Calendar – Accessible Event Manager (WordPress plugin, vendor: joedolson) — all versions up to and including 3.7.8

Severity

| Attribute | Value |
|—|—|
| CVSS v3.1 Base Score | 7.5 (HIGH) |
| Vector String | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |

Mitigation and recommended actions

  • Immediate action: Update the My Calendar – Accessible Event Manager plugin to the latest available version (3.7.16) via the WordPress admin dashboard or by downloading directly from the WordPress plugin repository. All versions above 3.7.8 are not listed as affected.
  • If immediate patching is not possible: Consider temporarily deactivating the plugin to eliminate the attack surface until an update can be applied. Additionally, restrict external access to your WordPress installation at the network or WAF level as a temporary measure.
  • With over 20,000 active installations, the exposure surface is significant. Internet-facing WordPress sites running this plugin should be treated as high-priority targets for this update.

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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