CVE-2025-7658 is a stored Cross-Site Scripting (XSS) vulnerability identified in the Temporarily Hidden Content plugin for WordPress, affecting all versions up to and including 1.0.6. The vulnerability stems from improper neutralization of input during web page generation, specifically within the 'temphc-start' shortcode, which fails to adequately sanitize and escape user-supplied attributes. This flaw allows authenticated attackers with contributor-level privileges or higher to inject arbitrary JavaScript code into pages. Because the malicious script is stored, it executes every time any user accesses the compromised page, potentially enabling session hijacking, defacement, or further attacks such as privilege escalation. The vulnerability's CVSS v3.1 base score is 6.4, reflecting a medium severity level, with an attack vector of network (remote), low attack complexity, requiring privileges (PR:L), no user interaction, and a scope change (S:C). The impact affects confidentiality and integrity but not availability. No public exploits have been reported yet. The vulnerability was published on July 19, 2025, and no official patches have been linked, indicating that users must rely on manual mitigation or vendor updates. The root cause is insufficient input validation and output encoding in the plugin's shortcode processing, a common source of stored XSS in web applications.

The vulnerability allows authenticated users with contributor-level access or higher to inject persistent malicious scripts into WordPress pages, which execute in the browsers of any users visiting those pages. This can lead to theft of session cookies, enabling attackers to impersonate other users, including administrators, potentially resulting in full site compromise. It can also facilitate defacement, phishing, or distribution of malware. Since contributors can typically create and edit content but not publish, the risk depends on the site's editorial workflow; however, if contributors can publish or if editors/admins view the injected content, the impact is significant. The scope change in the CVSS vector indicates that the vulnerability affects resources beyond the attacker's privileges, increasing risk. Organizations relying on this plugin may face data confidentiality breaches and integrity violations, undermining trust and potentially causing reputational damage. The lack of known exploits reduces immediate risk but does not eliminate it, as attackers may develop exploits. The vulnerability does not affect availability directly but can indirectly disrupt operations if exploited.

To mitigate CVE-2025-7658, organizations should first check for and apply any official patches or updates from the plugin vendor once available. In the absence of patches, administrators should restrict contributor-level access strictly, limiting the number of users who can add or edit content using the vulnerable shortcode. Implementing a content review workflow where editors or administrators approve content before publication can reduce risk. Additionally, site owners can apply Web Application Firewall (WAF) rules to detect and block malicious script payloads targeting the shortcode parameters. Manual code review and sanitization can be performed by developers to ensure all user inputs to the 'temphc-start' shortcode are properly sanitized and output encoded using secure coding libraries. Monitoring logs for unusual activity or injection attempts is recommended. Finally, educating users about the risks of XSS and enforcing strong authentication policies can help mitigate exploitation impact.