Attack Vectors

CVE-2026-25387 is a Medium-severity missing authorization issue (CVSS 4.3) affecting Image Optimizer – Optimize Images and Convert to WebP or AVIF (slug: image-optimization) in versions <= 1.7.1.

The primary attack path is through a legitimate login: an attacker needs an authenticated WordPress account with Subscriber-level access (or higher). In organizations that allow self-registration, run membership/community features, or maintain many low-privilege accounts (vendors, interns, agencies), this can expand the practical exposure.

Because the issue is reachable with low privileges and does not require user interaction (per the CVSS vector showing no UI requirement), it increases the likelihood of misuse once an account is obtained (including via password reuse, phishing, or compromised credentials).

Security Weakness

The vulnerability is caused by a missing capability check on a plugin function in Image Optimizer by Elementor up to and including version 1.7.1. In business terms, this means a feature that should be restricted to specific roles can be invoked by users who should not have that level of access.

Wordfence reports that this missing authorization control allows authenticated attackers (Subscriber and above) to perform an unauthorized action. The public advisory does not specify the exact action in the provided summary, so risk should be assessed assuming that a protected operation may be reachable by lower-privilege users.

No patch is currently known. Remediation guidance from the source recommends reviewing details and applying mitigations based on your organization’s risk tolerance, and notes that it may be best to uninstall the affected software and find a replacement.

Technical or Business Impacts

Even at a Medium severity, missing authorization issues create tangible business risk because they can undermine role-based controls—often a key assumption in governance, compliance workflows, and agency/vendor access models. If a Subscriber-level account can trigger actions intended for higher-privilege roles, it can lead to unexpected changes in site behavior or operational disruption.

Potential business impacts include: increased support and incident response burden, loss of confidence in site administration controls, and heightened risk when managing many authenticated users (customers, partners, affiliates, or staff). For compliance teams, this also raises questions about access control effectiveness and least-privilege enforcement.

Given that no patch is available, risk reduction typically comes from compensating controls: remove/uninstall the plugin where feasible, reduce or disable public registration if not required, audit and minimize Subscriber accounts, enforce strong authentication (unique passwords and MFA where possible), and increase monitoring/alerting for suspicious authenticated activity.

Similar Attacks

Authorization and privilege-related flaws in WordPress plugins have repeatedly been used to gain unauthorized capabilities or perform restricted actions. One well-known example is CVE-2018-19207, a privilege escalation issue in the WP GDPR Compliance plugin that demonstrated how access-control mistakes in plugins can translate into real administrative risk.

For this specific issue, track the official CVE record here: CVE-2026-25387, and the source advisory here: Wordfence vulnerability intelligence entry.