What is CVE-2026-84740?

CVE-2026-84740 is a medium-severity vulnerability in The Events Calendar, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 6.5/10. Published 2026-10-02.

How severe is CVE-2026-84740?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in The Events Calendar

CVE-2026-84740

The Events Calendar WordPress plugin before 6.17.5.1 does not validate or sanitise data submitted to an unauthenticated AJAX action before merging it into its rendering context, allowing unauthenticated users to execute arbitrary shortcodes registered on the site.

Published 2026-10-02 · last modified 2026-10-02.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

The Events Calendar

Weakness classification (CWE)

CWE-74 — Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection)

References

wpscan.com/vulnerability/3381a51e-beaa-4420-a33b-6a68612a2e8a/ (technical-description, exploit, vdb-entry)

Frequently asked questions

What is CVE-2026-84740?: CVE-2026-84740 is a medium-severity vulnerability in The Events Calendar, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 6.5/10. Published 2026-10-02.
How severe is CVE-2026-84740?: Medium severity. CVSS v3 base score is 6.5 out of 10.