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WordPress Events Calendar Vulnerabilities Let Hackers Take Over 600,000 Websites
Two unauthenticated RCE flaws (CVSS 9.8) in The Events Calendar WordPress plugin threaten 600,000 sites; patched in 6.17.4.1.
Wordfence Argus disclosed two critical unauthenticated vulnerability chains in The Events Calendar WordPress plugin, tracked as CVE-2026-78006 and CVE-2026-78159, both scoring 9.8 CVSS. CVE-2026-78006 enables PHP object injection leading to RCE via a Lazy_Post_Collection gadget chain, while CVE-2026-78159 abuses Element_Classes::parse_array() to invoke wp_update_user() and reset the admin password. Exploitation works by injecting wp:legacy-widget Gutenberg markup through comments, using WordPress's moderation-preview hash to trigger the block before approval. StellarWP patched both flaws in version 6.17.4.1 after Wordfence's August 2026 disclosure.
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Wordfence Argus Identifies Two Critical Unauthenticated Vulnerability Chains Leading to Remote Code Execution in The Events Calendar Plugin
Wordfence Argus found two critical unauthenticated RCE vulnerability chains in The Events Calendar WordPress plugin, active on over 600,000 sites.
Wordfence Argus identified two independent critical vulnerability chains in The Events Calendar WordPress plugin on August 21-22, 2026. Both chains originate in the plugin's widget-rendering pipeline and can lead to unauthenticated Remote Code Execution via two separate methods. The plugin is active on more than 600,000 websites.
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VU#212479: Sentry Seer vulnerability allows attacker-controlled input to be executed in a privileged environment
CERT/CC details CVE-2026-90999: attacker-controlled Sentry telemetry can steer the Seer coding agent into executing attacker code with repository access.
CERT/CC published VU#212479 for CVE-2026-90999 in Sentry Seer: attacker-submitted events through public DSN endpoints flow into Seer's root-cause analysis, which is embedded directly into the coding agent's initial prompt. In the documented chain, the privileged coding agent downloads and executes an attacker-controlled package before any human review, yielding arbitrary code execution with access to connected source repositories. No vendor patch is available yet; mitigations include disabling automated remediation, restricting coding-agent package installation, and filtering telemetry before Seer analysis.
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Microsoft Security Updates August 2015
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