CVE-2025-62900 identifies a stored cross-site scripting (XSS) vulnerability in the Popular Posts by Webline plugin for WordPress, developed by WeblineIndia. The vulnerability stems from improper neutralization of user-supplied input during the generation of web pages, allowing attackers to inject malicious JavaScript code that is stored persistently on the affected website. When other users visit the compromised pages, the injected scripts execute in their browsers, potentially leading to session hijacking, credential theft, defacement, or malware distribution. The vulnerability affects all versions of the plugin up to and including 1.1.1, with no specific version exclusions noted. The issue does not require authentication or user interaction for exploitation, increasing its risk profile. Although no known exploits are currently in the wild, the vulnerability's nature and the widespread use of WordPress plugins make it a significant threat. The lack of an official patch or CVSS score indicates that remediation is pending, but the vulnerability's characteristics align with common stored XSS attack vectors. This vulnerability is particularly concerning for websites that rely on the Popular Posts by Webline plugin to display dynamic content, as attackers can leverage the plugin's functionality to embed malicious payloads. The vulnerability was reserved and published in late October 2025, with Patchstack as the assigner, but no patch links are currently available.

For European organizations, the impact of CVE-2025-62900 can be substantial, especially for those operating WordPress-based websites that utilize the Popular Posts by Webline plugin. Successful exploitation can compromise the confidentiality and integrity of user data by enabling attackers to steal session cookies or credentials, leading to unauthorized access. The availability of the website could also be affected if attackers deface pages or inject disruptive scripts. Organizations in sectors such as e-commerce, media, and government, which often rely on WordPress for content management, may face reputational damage and regulatory consequences under GDPR if user data is compromised. The persistent nature of stored XSS means that malicious scripts remain active until removed, increasing the window of exposure. Additionally, attackers could use the vulnerability as a foothold for further attacks within the network or to distribute malware to site visitors, amplifying the threat. The absence of known exploits in the wild currently reduces immediate risk but does not diminish the potential impact once exploitation occurs.

To mitigate CVE-2025-62900, European organizations should first inventory their WordPress installations to identify the use of the Popular Posts by Webline plugin. Until an official patch is released, administrators should consider disabling or removing the plugin to eliminate the attack vector. If removal is not feasible, applying manual input validation and output encoding on all user-supplied data processed by the plugin can reduce risk. Web application firewalls (WAFs) should be configured to detect and block typical XSS payloads targeting the plugin's endpoints. Regularly monitoring web server logs and website content for unauthorized script injections can help detect exploitation attempts early. Organizations should also educate content editors and administrators about the risks of stored XSS and enforce strict content moderation policies. Once a patch becomes available, prompt testing and deployment are critical. Additionally, implementing Content Security Policy (CSP) headers can limit the execution of unauthorized scripts, providing an additional layer of defense. Backup procedures should be reviewed to ensure rapid recovery in case of compromise.