WordPress Eventpress Plugin Privilege Escalation via Parameter Validation

The Mage Eventpress plugin for WordPress is vulnerable to privilege escalation in versions up to, and including, 5.7.8 This is due to the mep_grant_shop_manager_access() function hooking user_has_cap and unconditionally granting manage_options whenever an attacker-controllable request marker matches — most notably $_GET['page'] starting with 'mep_' or 'mpwem_', which is never validated against an actually registered EventPress screen. This makes it possible for authenticated attackers, with Shop Manager-level access and above, to elevate their privileges to Administrator by appending ?page=mep_x to core admin URLs (options-general.

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 Mage Eventpress plugin for WordPress contains a critical privilege escalation flaw in versions up to 5.7.8 where the mep_grant_shop_manager_access() function unconditionally grants administrative capabilities (manage_options) based on unvalidated request parameters. Attackers only need to be authenticated users—a relatively low barrier—to exploit this by crafting requests with GET parameters starting with 'mep_' or 'mpwem_' that don't correspond to actual registered EventPress screens. This vulnerability matters because WordPress sites relying on role-based access controls to segregate Shop Manager from Administrator privileges are rendered ineffective, allowing attackers to escalate from low-privilege accounts to full administrative control. Any organization running Eventpress is potentially affected, particularly those with contributor or subscriber accounts that should have limited access.

Casky's 224 matched skills—powered by Claude's extended reasoning capabilities—detect the attack patterns underlying CWE-269 (Improper Access Control) and MITRE ATT&CK technique TA0004 (Privilege Escalation) by analyzing authorization bypass signatures. Practitioners using Casky would see findings flagging suspicious authentication hooks that grant capabilities without validating context, parameter tampering patterns where GET variables control security decisions, and anomalous privilege grant events tied to unregistered plugin pages. The platform would surface instances where user_has_cap filters are circumvented, requests to non-existent administrative pages succeed, and low-privilege accounts suddenly execute high-privilege actions—all key indicators of this parameter-validation-failure attack. This enables defenders to identify compromised accounts attempting this technique and patch vulnerable plugin versions before attackers gain foothold.

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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-2026-109381.

abusing-dpapi-for-credential-access

red teaming · high

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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-2026-109381

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