CVE-2026-1655: 
WordPress vulnerability analysis and mitigation

CVE-2026-1655 is a missing authorization vulnerability in the EventPrime plugin for WordPress that allows authenticated attackers to modify posts created by administrators. All versions up to and including 4.2.8.4 are affected. The vulnerability was published on February 18, 2026, and tracked by Red Hat on February 19, 2026. It carries a CVSS v3.1 base score of 4.3 (Medium) (Red Hat CVE).

The root cause is a missing authorization check (CWE-862) in the save_frontend_event_submission function of the EventPrime plugin. This function accepts a user-controlled event_id parameter and updates the corresponding WordPress event post without verifying whether the requesting user owns the post or has the necessary capabilities. An authenticated attacker with at least Customer-level privileges can exploit this by supplying an arbitrary event_id belonging to an administrator-created post, provided they can obtain a valid nonce (Red Hat CVE).

Successful exploitation allows authenticated low-privileged users (Customer role and above) to modify event posts created by administrators, resulting in unauthorized content tampering. The impact is limited to integrity — there is no confidentiality or availability impact. While lateral movement potential is low, an attacker could deface or corrupt event listings, potentially misleading site visitors or disrupting event management workflows (Red Hat CVE).

No public proof-of-concept exploit code or in-the-wild exploitation has been reported for this vulnerability. The EPSS score is approximately 0.011% (0.000110), indicating a very low probability of exploitation in the near term. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. Exploitation requires authentication (Customer role or higher) and the ability to obtain a valid WordPress nonce, which limits opportunistic exploitation (Red Hat CVE).

1. Obtain authentication: Register or log in to the target WordPress site with at least a Customer-level account.
2. Obtain a valid nonce: Navigate to the EventPrime event submission form on the frontend to capture a valid WordPress nonce from the page source or network traffic.
3. Identify target post ID: Enumerate or guess the event_id of an administrator-created event post (e.g., by browsing public event listings and noting post IDs in URLs or page source).
4. Craft malicious request: Submit a POST request to the EventPrime frontend event submission endpoint, supplying the target administrator's event_id and the captured nonce, along with modified event content (e.g., altered title, description, or date).
5. Confirm modification: Verify that the administrator-owned event post has been updated with the attacker-supplied content, confirming unauthorized post modification (Red Hat CVE).

• Logs: WordPress access logs showing authenticated POST requests to the EventPrime frontend submission endpoint with event_id values belonging to administrator-created posts from non-administrator user accounts.
• Logs: WordPress debug or audit logs recording unexpected post updates to event posts where the modifying user does not match the post author.
• File System: No file system artifacts are expected, as exploitation occurs entirely through the web application layer.
• Network: Repeated POST requests to the EventPrime submission URL from the same authenticated session with varying event_id parameters, potentially indicating enumeration of post IDs.

Users should update the EventPrime plugin to a version beyond 4.2.8.4 that includes authorization checks in the save_frontend_event_submission function. As a temporary workaround, site administrators can restrict frontend event submission capabilities to trusted user roles only, or disable the frontend event submission feature until a patched version is available. Monitoring WordPress audit logs for unexpected post modifications by low-privileged users is also recommended (Red Hat CVE).