Executive Summary

CVE-2026-25347 is a Cross-Site Scripting (XSS) vulnerability in the WordPress WP REST Cache plugin developed by Acato. It affects versions up to and including 2026.1.0.

This vulnerability allows attackers to inject malicious scripts, such as redirects, advertisements, or other HTML payloads, into affected websites. These scripts execute when visitors access the site.

Exploitation can be initiated by an unauthenticated user but requires user interaction by a privileged user, such as clicking a malicious link, visiting a crafted page, or submitting a form.

The vulnerability is classified under OWASP Top 10 category A3: Injection and has a CVSS score of 7.1, indicating medium severity.

Useful 0 Not Useful 0

Impact Analysis

This vulnerability can impact you by allowing attackers to execute malicious scripts on your website, which can lead to unauthorized redirects, display of unwanted advertisements, or other harmful HTML payloads.

Such attacks can compromise the integrity and trustworthiness of your website, potentially harming your users and damaging your reputation.

Because exploitation requires interaction by a privileged user, attackers may trick administrators or other high-privilege users into triggering the malicious scripts, increasing the risk of further compromise.

The vulnerability is moderately dangerous and may be targeted in mass-exploit campaigns affecting many websites.

To mitigate the risk, it is strongly recommended to update the WP REST Cache plugin to version 2026.1.1 or later.

Useful 0 Not Useful 0

Detection Guidance

The vulnerability allows attackers to inject malicious scripts into affected websites, which execute when visitors access the site. Detection involves monitoring for unusual script injections or unexpected HTML payloads in web pages served by the WP REST Cache plugin.

Since the vulnerability is a Stored Cross-Site Scripting (XSS), detection can include reviewing logs for suspicious requests or payloads targeting the WP REST Cache plugin endpoints.

Specific commands are not provided in the available resources.

Useful 0 Not Useful 0

Mitigation Strategies

The immediate and recommended mitigation step is to update the WP REST Cache plugin to version 2026.1.1 or later, where the vulnerability has been patched.

Until the update can be applied, users can implement mitigation rules provided by Patchstack that block attacks exploiting this vulnerability.

Enabling automatic updates for vulnerable plugins can also enhance security and reduce the risk of exploitation.

Useful 0 Not Useful 0

Compliance Impact

The vulnerability allows attackers to inject malicious scripts into affected websites, which can lead to unauthorized access or manipulation of user data.

Such unauthorized access or data manipulation can potentially result in non-compliance with data protection regulations like GDPR and HIPAA, which require safeguarding personal and sensitive information against unauthorized disclosure or alteration.

Therefore, if exploited, this vulnerability could compromise the confidentiality and integrity of data, impacting compliance with these common standards and regulations.

Useful 0 Not Useful 0