CVE-2025-58703 is a Stored Cross-Site Scripting (XSS) vulnerability classified under CWE-79, affecting the Skyword API Plugin up to version 2.5.3. This vulnerability arises from improper neutralization of input during web page generation, allowing malicious actors to inject and store malicious scripts within the plugin's data handling processes. When a victim accesses the affected web pages or interfaces that render this stored data, the malicious script executes in the context of the victim's browser. The CVSS 3.1 score for this vulnerability is 6.5 (medium severity), with the vector indicating network attack vector (AV:N), low attack complexity (AC:L), requiring privileges (PR:L), user interaction (UI:R), scope changed (S:C), and low impact on confidentiality, integrity, and availability (C:L/I:L/A:L). The vulnerability requires an attacker to have some level of privileges on the system and to trick a user into interacting with the malicious content. The scope change indicates that the vulnerability affects components beyond the initially vulnerable component, potentially impacting other parts of the system or user sessions. Stored XSS vulnerabilities are particularly dangerous because they can lead to session hijacking, credential theft, defacement, or distribution of malware. The lack of known exploits in the wild suggests this vulnerability is newly disclosed or not yet weaponized. No patches or fixes are currently linked, indicating that affected organizations must monitor vendor updates closely. The vulnerability affects the Skyword API Plugin, a tool used for content management and API integration, which is often embedded in web platforms to manage content workflows and API interactions.

For European organizations using the Skyword API Plugin, this vulnerability poses a risk of client-side attacks that can compromise user sessions, steal sensitive data, or manipulate content integrity. Organizations in sectors such as media, publishing, marketing, and any enterprise relying on Skyword for content management are at risk. Exploitation could lead to reputational damage, data breaches involving user credentials or personal data, and potential regulatory non-compliance under GDPR due to unauthorized data exposure. The requirement for some privileges and user interaction reduces the likelihood of widespread automated exploitation but does not eliminate targeted attacks, especially against high-value targets. The scope change increases the risk that exploitation could affect multiple components or user roles within an organization’s web infrastructure. Given the interconnected nature of European digital services and the emphasis on data protection, even medium-severity vulnerabilities like this can have outsized impacts if exploited in critical systems.

Organizations should immediately audit their use of the Skyword API Plugin to identify affected versions (up to 2.5.3). Until a vendor patch is released, implement strict input validation and output encoding on all user-supplied data processed by the plugin to prevent script injection. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in browsers. Review and minimize user privileges to reduce the risk posed by attackers needing some level of access. Conduct security awareness training to reduce the risk of user interaction with malicious content. Monitor web application logs for unusual input patterns or script injections. Consider deploying Web Application Firewalls (WAFs) with rules targeting XSS payloads specific to Skyword plugin behaviors. Engage with the vendor to obtain timelines for patches and apply updates promptly once available. Additionally, perform regular security testing and code reviews on integrations involving the plugin to detect and remediate similar input handling issues proactively.