CVE-2025-2510 is a stored cross-site scripting vulnerability identified in the Frndzk Expandable Bottom Bar plugin for WordPress, maintained by bittokazi. The flaw arises from improper input sanitization and output escaping of the 'text' parameter, allowing malicious scripts to be stored and executed when a user accesses an infected page. This vulnerability affects all versions up to and including 1.0. Exploitation requires an attacker to have authenticated access with administrator-level permissions or higher, limiting the attack surface to privileged users. The vulnerability specifically impacts WordPress multi-site installations or those where the unfiltered_html capability is disabled, as these configurations restrict direct HTML input, making the plugin's sanitization failure exploitable. The vulnerability is classified under CWE-79, indicating improper neutralization of input during web page generation. The CVSS v3.1 base score is 5.5, with vector AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N, indicating network attack vector, low attack complexity, high privileges required, no user interaction, scope changed, and limited confidentiality and integrity impacts without availability impact. No patches or known exploits are currently available, but the vulnerability's presence in a plugin commonly used in multi-site WordPress environments poses a moderate risk.

The primary impact of CVE-2025-2510 is the potential for stored XSS attacks that can compromise the confidentiality and integrity of affected WordPress sites. An attacker with administrator privileges can inject malicious JavaScript that executes in the browsers of users visiting the infected pages, potentially leading to session hijacking, privilege escalation, or unauthorized actions performed on behalf of users. Although the vulnerability requires high privileges, it could be leveraged in insider threat scenarios or if an attacker compromises an admin account. The scope change in the CVSS vector indicates that the vulnerability affects resources beyond the attacker’s privileges, increasing risk. Multi-site WordPress installations are particularly at risk, as they often host multiple sites under a single installation, amplifying the potential impact. The absence of availability impact limits the risk of denial-of-service conditions. Organizations relying on this plugin in multi-site environments or with restricted HTML capabilities should consider the risk moderate but significant enough to warrant remediation.

To mitigate CVE-2025-2510, organizations should first verify if they are running the Frndzk Expandable Bottom Bar plugin in multi-site WordPress installations or with unfiltered_html disabled. Since no official patch is currently available, administrators should consider disabling or uninstalling the plugin until a fix is released. Restrict administrator account access and enforce strong authentication mechanisms to reduce the risk of privilege abuse. Implement web application firewalls (WAFs) with rules to detect and block stored XSS payloads targeting the 'text' parameter of this plugin. Conduct regular security audits and monitor logs for suspicious activity related to script injection attempts. Additionally, consider applying content security policies (CSP) to limit the execution of unauthorized scripts. Once a patch is released, promptly update the plugin to the fixed version. Educate administrators about the risks of stored XSS and the importance of cautious input handling, even with high privileges.