CVE-2025-58845 in Bulk Watermark Plugin
Summary
by MITRE • 09/05/2025
Cross-Site Request Forgery (CSRF) vulnerability in ChrisHurst Bulk Watermark allows Reflected XSS. This issue affects Bulk Watermark: from n/a through 1.6.10.
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Analysis
by VulDB Data Team • 09/05/2025
The CVE-2025-58845 vulnerability represents a critical security flaw in the ChrisHurst Bulk Watermark WordPress plugin that combines cross-site request forgery with reflected cross-site scripting capabilities. This vulnerability exists within the plugin's handling of user input and request processing mechanisms, creating a dangerous attack vector that can be exploited by malicious actors to execute arbitrary code in the context of authenticated users. The affected version range spans from an unspecified initial version through 1.6.10, indicating a prolonged period during which this vulnerability has been present in the software ecosystem.
The technical implementation of this vulnerability stems from insufficient validation and sanitization of input parameters within the plugin's administrative interfaces. When users access certain endpoints with crafted malicious payloads, the plugin fails to properly validate the authenticity of requests, allowing attackers to inject malicious scripts that are then reflected back to users. This dual nature of the vulnerability means that attackers can leverage CSRF mechanisms to trick authenticated users into executing malicious requests while simultaneously exploiting reflected XSS to inject and execute arbitrary JavaScript code. The vulnerability operates at the intersection of web application security flaws where the lack of proper anti-CSRF tokens combined with inadequate input sanitization creates a perfect storm for exploitation.
The operational impact of this vulnerability is severe and multifaceted, as it can enable attackers to perform unauthorized actions on behalf of authenticated users with elevated privileges. Attackers can exploit this vulnerability to modify plugin settings, upload malicious files, or even gain full administrative control over affected WordPress installations. The reflected XSS component amplifies the attack surface by allowing attackers to execute scripts in the browser context of authenticated users, potentially leading to session hijacking, credential theft, or further exploitation of the compromised system. This vulnerability particularly affects WordPress environments where the Bulk Watermark plugin is installed and actively used, creating widespread potential for exploitation across multiple websites and organizations.
Mitigation strategies for this vulnerability should prioritize immediate plugin updates to versions that address the identified security flaws, as well as implementing proper input validation and output encoding mechanisms. Organizations should ensure that all WordPress installations maintain current plugin versions and regularly audit their security configurations. The implementation of proper anti-CSRF token mechanisms and comprehensive input sanitization should be enforced across all user-facing interfaces. Additionally, network-level security controls such as web application firewalls and intrusion detection systems can provide additional layers of protection against exploitation attempts. This vulnerability aligns with CWE-352 for CSRF and CWE-79 for XSS, and maps to ATT&CK techniques involving credential access and privilege escalation through web application exploitation.