WP Event Manager Post Ownership Verification Bypass

The WP Event Manager WordPress plugin before 3.4.2 does not verify the ownership or the post type of a user supplied post identifier in its front-end event submission flow, allowing unauthenticated attackers to read and overwrite the content of arbitrary unpublished posts and pages, and to convert them into events.

Casky was already ahead

This CVE exploits attack patterns that Casky's 283matched 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

CVE-2026-86442 is an authorization vulnerability in the WP Event Manager WordPress plugin that fails to validate post ownership or post type during front-end event submissions. This allows unauthenticated attackers to read and modify arbitrary unpublished posts and pages, then convert them into events. The vulnerability affects any WordPress installation running the vulnerable plugin version, putting sensitive draft content, pending reviews, and scheduled posts at risk of unauthorized access and manipulation. Organizations using this plugin for content management, event coordination, or multi-author workflows face immediate threats to content integrity and confidentiality.

Casky's 283 mapped security skills leverage Claude's extended reasoning to correlate this vulnerability with MITRE ATT&CK techniques TA0004 (Privilege Escalation) and TA0006 (Credential Access). Practitioners would observe detection patterns flagging: (1) unauthorized post ID enumeration attempts in web logs, (2) POST requests to event submission endpoints with mismatched user-post associations, (3) draft or unpublished content appearing in event listings, and (4) rapid sequential access to posts the user shouldn't have permissions for. Claude's reasoning would identify these as indicators of post-type confusion and improper access control checks, allowing security teams to distinguish this specific authorization bypass from other WordPress vulnerabilities and implement targeted mitigations like plugin updates, input validation hardening, and post-ownership verification enforcement.

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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 →

283 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-86442.

abusing-dpapi-for-credential-access

red teaming · high

Run

abusing-shadow-credentials-for-privesc

red teaming · high

Run

Access with Stolen Session Cookie

cryptography · low

Run

MITRE ATT&CK Techniques

TA0004 TA0006

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