Overview
CVE-2025-63499 describes a Cross-Site Scripting (XSS) vulnerability found in Alinto Sogo version 5.12.3. This vulnerability allows attackers to inject arbitrary web scripts into the web pages viewed by other users. The specific attack vector lies within the theme parameter of the Sogo application.
Technical Details
The vulnerability exists due to insufficient sanitization of user-supplied input within the theme parameter. An attacker can craft a malicious URL containing JavaScript code within this parameter. When a user clicks on this crafted URL, the injected JavaScript code executes in their browser, potentially allowing the attacker to steal cookies, redirect the user to a phishing site, or deface the web page.
A sample malicious URL might look like this:
https://email.victim.com/SOGo/so/victim@victim.com/Mail/view?theme=%27%3CScRiPt%20%3Ealert%289998%29%3C%2FScRiPt%3EThis URL injects a simple JavaScript alert box. In a real-world attack, a more sophisticated script would be used.
CVSS Analysis
Currently, the CVSS score for CVE-2025-63499 is listed as N/A. This is likely because the vulnerability is newly discovered and the score is pending assessment by the NVD (National Vulnerability Database) or similar authority. Once assessed, the CVSS score will provide a standardized measure of the vulnerability’s severity. However, given the nature of XSS vulnerabilities, it is likely to be rated as Medium to High severity, depending on the exploitability and potential impact.
Possible Impact
The impact of this XSS vulnerability can be significant. An attacker could:
- Steal user credentials: By injecting JavaScript to capture keystrokes or read cookies.
- Deface the Sogo web application: Injecting code to alter the appearance of the Sogo interface.
- Redirect users to phishing sites: Tricking users into entering their credentials on a fake login page.
- Spread malware: Injecting code that downloads and executes malicious software on the user’s machine.
- Gain unauthorized access: In some cases, XSS can be leveraged to bypass authentication mechanisms.
Mitigation and Patch Steps
To mitigate this vulnerability, it is highly recommended to take the following steps:
- Upgrade to a patched version of Alinto Sogo: Check the Alinto website for updates or patches addressing CVE-2025-63499. If available, apply the patch immediately.
- Implement input validation and output encoding: Ensure that all user-supplied input, including the
themeparameter, is properly validated and sanitized to prevent the injection of malicious code. Output encoding should be used to escape potentially harmful characters before they are rendered in the web page. This should be addressed by the vendor. - Web Application Firewall (WAF): Deploy a Web Application Firewall (WAF) with rulesets designed to detect and block XSS attacks. While not a permanent fix, a WAF can provide an immediate layer of protection.
- Educate users: Train users to be cautious about clicking on links from untrusted sources, especially links received via email.
References
Proof of Concept (Potentially Harmful – Use with Caution)
GitHub Exploit Details
