CVE-2025-58871

Vulnerability

Analysis

Master Paper Collapse Toggle for WordPress, version 1.1 and earlier, contains a stored cross-site scripting (XSS) vulnerability due to improper neutralization of user-supplied input during page generation [1]. This allows an attacker to inject malicious JavaScript or HTML that persists in the application and executes when other users view the affected content.

Exploitation

The vulnerability is exploitable by an authenticated user with low-level privileges, requiring no special network access beyond posting or saving content in the affected plugin's toggle elements. User interaction from a privileged user (e.g., an admin clicking a crafted link or visiting a page) is also a prerequisite for the stored payload to be triggered in certain contexts [1]. Attackers frequently chain such flaws in mass-exploit campaigns, targeting numerous WordPress installations at once.

Impact

Successful exploitation enables the attacker to execute arbitrary scripts in the context of the victim's browser, potentially leading to session hijacking, redirection to malicious sites, injection of unwanted advertisements, or other HTML/JavaScript payloads. This undermines site integrity and can harm visitors.

Mitigation

The vendor has not released a patched version for this plugin as of the publication date. Immediate mitigation includes updating the plugin to any available newer version, or if unsupported, replacing it with an alternative. Site administrators should also sanitize user input and apply WordPress security best practices [1].