Risk Letters

Exploited vulnerability

CVE-2026-84740

TLP:CLEAR

StellarWP the_events_calendar Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

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.

Facts

  • Vendor: StellarWP
  • Product: the_events_calendar
  • EPSS (probability of exploitation within 30 days): 0.2 %
  • First known exploitation: 22 October 2026
  • First seen by Risk Letters: 22 October 2026

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Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD