Overview
This blog post details CVE-2025-63498, a Cross-Site Scripting (XSS) vulnerability discovered in alinto SOGo version 5.12.3. This vulnerability allows an attacker to inject malicious scripts into the application through the “userName” parameter, potentially compromising user accounts and data.
Technical Details
The vulnerability exists because SOGo 5.12.3 fails to properly sanitize the “userName” parameter before rendering it in the application’s interface. This allows an attacker to inject arbitrary JavaScript code, which will be executed in the context of the victim’s browser when they access the affected page.
A successful exploit could allow an attacker to:
- Steal user session cookies.
- Deface the application.
- Redirect users to malicious websites.
- Gain unauthorized access to sensitive data.
Example of a potentially malicious URL:
https://example.com/sogo/login?userName=<script>alert('XSS Vulnerability!')</script>CVSS Analysis
CVE-2025-63498 has been assigned a CVSS score of 6.1, indicating a MEDIUM severity. This score reflects the potential impact of the vulnerability and the relative ease of exploitation.
- CVSS Score: 6.1
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: Required
- Scope: Changed
- Confidentiality Impact: Low
- Integrity Impact: Low
- Availability Impact: Low
Possible Impact
The exploitation of this XSS vulnerability can have several negative consequences:
- Data Breach: Attackers can steal sensitive information, including usernames, passwords, and email content.
- Account Takeover: Stolen cookies or injected scripts can be used to hijack user accounts.
- Reputation Damage: A successful attack can damage the reputation of the organization using the vulnerable SOGo instance.
- Malware Distribution: Attackers can use the vulnerability to distribute malware to users of the affected SOGo instance.
Mitigation or Patch Steps
To mitigate the risk posed by CVE-2025-63498, the following steps are recommended:
- Upgrade to a patched version: Upgrade SOGo to a version higher than 5.12.3 that includes a fix for this vulnerability. Check the Alinto SOGo website for the latest versions.
- Input Validation: Implement robust input validation and sanitization for all user-supplied data, including the “userName” parameter. Ensure that all input is properly encoded before being rendered in the application.
- Web Application Firewall (WAF): Deploy a WAF to detect and block malicious requests targeting the “userName” parameter. Configure the WAF with rules to filter out XSS payloads.
- Content Security Policy (CSP): Implement a strict CSP to restrict the sources from which scripts can be loaded and prevent inline script execution.
