Risk Letters

Exploited vulnerability

CVE-2026-78006

TLP:CLEAR

StellarWP the_events_calendar Deserialization of Untrusted Data

The The Events Calendar plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, 6.17.4 via the is_safe_widget_instance function. This is due to insufficient protection in is_safe_widget_instance, which can be bypassed because PHP fires magic methods during its pre-parse, combined with enable_rendering_widget_copied() forging a valid wp_hash integrity attri

Facts

  • Vendor: StellarWP
  • Product: the_events_calendar
  • CVSS: 9.8
  • EPSS (probability of exploitation within 30 days): 1.5 %
  • First known exploitation: 12 September 2026
  • First seen by Risk Letters: 12 September 2026

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