WordPress Eventin Plugin Unconditional Privilege Escalation Flaw

The Eventin – Event Calendar, Tickets, Registration, Booking & WooCommerce plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 4.1.23. This is due to the `PermissionManager::manage_permissions()` function being registered as a callback on WordPress core's `map_meta_cap` filter and unconditionally returning the always-true `'exist'` primitive for every capability check whenever the evaluated user ID is 1, without scoping this behavior to plugin-specific capabilities. This makes it possible for authenticated attackers whose account is user ID 1, even subscribers, to pass every WordPress capability check, including `manage_options`, `edit_plugins`, `edit_themes`, `promote_users`, and `update_core`, thereby elevating their privileges to administrator-equivalent power and achieving full site takeover, including remote code execution via the plugin and theme editors. Exploitation is only impactful when user ID 1 has been deliberately demoted to a

Casky was already ahead

This CVE exploits attack patterns that Casky's 224matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.

Analysis

The Eventin Event Calendar plugin for WordPress contains a critical privilege escalation vulnerability in its PermissionManager::manage_permissions() function that bypasses WordPress capability checks. By hooking into WordPress's map_meta_cap filter, the plugin unconditionally returns 'exist' (a primitive that evaluates to true) for any capability check when the user ID is 1, effectively granting administrative privileges regardless of actual permissions. This affects all versions up to 4.1.23 and impacts any WordPress site running this popular event management plugin. Authenticated attackers—even those with minimal privileges—can exploit this to gain administrative access, compromise site integrity, and pivot to further attacks.

Casky's 224 mapped skills leverage Claude AI's extended reasoning to detect the attack patterns underlying this vulnerability by analyzing MITRE ATT&CK technique TA0004 (Privilege Escalation). Practitioners using Casky would observe findings related to improper capability filtering, suspicious meta_cap hook behavior, and unconditional permission grants tied to specific user IDs. The platform's skills would flag capability-checking anomalies in WordPress plugin filters, detect hardcoded user ID logic that bypasses authorization controls, and correlate these patterns with privilege escalation indicators. Security teams would see detailed behavioral signals showing how low-privileged accounts suddenly gain administrative capabilities, enabling them to hunt for exploitation attempts in access logs and plugin audit trails before attackers can establish persistence.

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Casky Risk Score

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EPSS Probability

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Shodan Exposure

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GreyNoise Signal

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Composite risk scoring from EPSS, CISA KEV, Shodan, and GreyNoise — 21 security APIs correlated into a single Casky Risk Score. Coming in Casky Pro. Join early access →

224 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-75983.

abusing-dpapi-for-credential-access

red teaming · high

Run

abusing-shadow-credentials-for-privesc

red teaming · high

Run

Access with Stolen Session Cookie

identity access management · low

Run

MITRE ATT&CK Techniques

TA0004

Investigate the attack patterns behind CVE-2026-75983

Casky has 224 skills that investigate the attack patterns behind CVE-2026-75983. Run one and get CVSS-scored findings in 3 minutes.

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