Attack Vectors

Post Slides (slug: post-slides) is reported as vulnerable to Local File Inclusion (LFI) in versions up to and including 1.0.1. The severity is rated High (CVSS 7.5).

The advisory title describes this as an authenticated issue requiring at least a Contributor-level user, while the summary also notes scenarios where unauthenticated attackers may be able to trigger inclusion and execution of server-side PHP files. In practical business terms, any path that lets an attacker reach the vulnerable functionality—through a compromised low-privilege account, reused passwords, phishing, or exposed endpoints—can put the website at risk.

Because LFI can be chained with other weaknesses (such as permissive upload paths), organizations should treat this as a high-priority web risk even if they believe “only logged-in users” can access it.

Security Weakness

This vulnerability is a Local File Inclusion weakness, meaning the plugin may allow an attacker to force the site to load server files it should never load through normal use. If a PHP file can be included, it can potentially be executed by the server.

According to the published details, this can be used to bypass access controls, obtain sensitive data, or achieve code execution in cases where PHP files can be uploaded and then included. The issue is tracked as CVE-2025-15491 and referenced by Wordfence as the source of the vulnerability information.

Remediation note: there is no known patch available at this time. Risk decisions should be made based on your organization’s tolerance, and it may be best to uninstall Post Slides and replace it with a safer alternative.

Technical or Business Impacts

A successful exploit of this High-severity issue can turn a marketing website into a business liability. Potential impacts include data exposure (customer contact data, internal documents, configuration information), site takeover (malicious code injected into pages or templates), and service disruption (defacement, downtime, or being used to distribute malware).

For marketing and executive stakeholders, the most material risks are brand damage, loss of lead-gen revenue, increased acquisition costs due to compromised landing pages, and regulatory/compliance consequences if personal data is accessed. Response costs can also include incident forensics, emergency rebuilds, customer notifications, and higher ongoing security spend.

Given the lack of a known patch, practical mitigations typically include: removing the plugin where feasible, tightening user access (especially Contributor-level accounts), reviewing upload and file-handling controls, increasing monitoring for unusual site behavior, and considering web application firewall protections appropriate to your environment.

Similar Attacks

WordPress ecosystems have seen real-world compromises driven by plugin weaknesses that enabled attackers to run unauthorized code or upload malicious files. Examples include:

CVE-2020-25213 (WP File Manager) — a widely reported plugin issue that attackers leveraged to compromise sites through malicious file activity.

CVE-2014-9734 (TimThumb) — a long-running, well-documented case where a common WordPress component vulnerability contributed to large-scale site compromises.