CVE-2025-2204 is a Cross-Site Scripting (XSS) vulnerability classified under CWE-79, discovered in Tapandsign Technologies Software Inc.'s Tap&Sign software. The flaw stems from improper neutralization of user-supplied input during the generation of web pages, which allows an attacker to inject malicious scripts that execute in the context of the victim's browser. This vulnerability affects all versions of Tap&Sign up to 23012026. The CVSS v3.1 base score is 4.7, indicating a medium severity level. The attack vector is network-based (AV:N), with low attack complexity (AC:L), but requires high privileges (PR:H) and no user interaction (UI:N). The scope is unchanged (S:U), and the impact on confidentiality, integrity, and availability is low to medium (C:L/I:L/A:L). The vendor was contacted early for disclosure but did not respond, and no patches or mitigations have been published. No known exploits have been detected in the wild. The vulnerability could allow an attacker with high privileges to inject malicious scripts that may steal sensitive information, manipulate data, or disrupt service within the Tap&Sign environment.

The vulnerability could allow attackers with high privileges to execute arbitrary scripts in the context of the affected web application, potentially leading to theft of sensitive information such as authentication tokens or user data, manipulation of displayed content, or disruption of service. Although the impact is rated medium, the requirement for high privileges limits the ease of exploitation. Organizations relying on Tap&Sign for digital signing or document workflows may face risks of data leakage, unauthorized actions, or reputational damage if exploited. The lack of vendor response and absence of patches increases the window of exposure. Attackers could leverage this vulnerability as part of a broader attack chain, especially in environments where Tap&Sign is integrated with critical business processes.

Until an official patch is released, organizations should implement strict input validation and output encoding on all user-supplied data within the Tap&Sign environment to prevent script injection. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts. Limit access to Tap&Sign interfaces to trusted users and networks, enforcing the principle of least privilege to reduce the risk posed by high-privilege attackers. Monitor web application logs for suspicious input patterns indicative of XSS attempts. Consider deploying web application firewalls (WAFs) with rules targeting XSS payloads specific to Tap&Sign. Regularly review and update security configurations and educate administrators about the risks of XSS in this context. Maintain vigilance for vendor updates or community patches and plan for timely deployment once available.