YSlider <= 1.1 - クロスサイトリクエストフォージェリによる格納型クロスサイトスクリプティング

The primary impact of CVE-2025-12590 is the ability for an attacker to execute arbitrary JavaScript code within the context of a user's browser. This can lead to a variety of malicious actions, including session hijacking, defacement of the website, redirection to phishing sites, and theft of sensitive information such as login credentials or personal data. The vulnerability's reliance on a forged request means an attacker needs to convince an administrator to click a malicious link, making social engineering a key component of exploitation. Successful exploitation could severely damage a website's reputation and compromise user trust.

Websites utilizing the YSlider plugin, particularly those with administrator accounts that are susceptible to social engineering attacks, are at risk. Shared hosting environments where multiple websites share the same server resources are also at increased risk, as a compromise of one website could potentially lead to the compromise of others.

• wordpress / composer / npm: Use wp-cli plugin update YSlider to check for updates. • wordpress / composer / npm: Inspect the plugin's code for missing nonce verification on the content configuration page. • generic web: Monitor access logs for suspicious requests to the plugin's configuration page, particularly those originating from unusual IP addresses.

grep -i 'YSlider' /var/log/apache2/access.log | grep -i 'content-configuration'

1. 2025-11-11Disclosure

   disclosure

1. 予約済み2025-10-31
2. 公開日2025-11-11
3. 更新日2026-04-08
4. EPSS 更新日2026-03-23

The most effective mitigation for CVE-2025-12590 is to immediately update the YSlider plugin to a version that addresses the vulnerability. If upgrading is not immediately feasible, consider implementing a Web Application Firewall (WAF) with rules to block suspicious requests targeting the content configuration page. Additionally, enforce strict input validation and output encoding on all user-supplied data within the plugin. Regularly review WordPress plugin configurations and ensure that only trusted plugins are installed. After upgrade, confirm by accessing the plugin's configuration page and verifying that no malicious scripts are injected.