Executive Summary

CVE-2025-71276 is a cross-site scripting (XSS) vulnerability in the SOGo groupware server versions before 5.12.5. It affects the handling of events, tasks, and contacts categories.

The vulnerability occurs because JSON parameters extracted from HTTP request bodies were parsed directly from raw content strings without proper sanitization. This allowed attackers to inject malicious HTML or script code.

The fix involves sanitizing the raw JSON input strings before parsing them, preventing execution of injected malicious scripts in the user interface editors for contacts, contact lists, appointments, and tasks.

Useful 0 Not Useful 0

Impact Analysis

This XSS vulnerability can allow an attacker to inject malicious scripts into the SOGo application, which could then be executed in the context of other users interacting with events, tasks, or contacts.

Potential impacts include theft of user credentials, session hijacking, unauthorized actions performed on behalf of users, or delivery of malware.

Since the vulnerability has a CVSS base score of 6.4 with network attack vector and low attack complexity, it can be exploited remotely with limited privileges and no user interaction.

Useful 0 Not Useful 0

Compliance Impact

I don't know

Useful 0 Not Useful 0

Detection Guidance

[{'type': 'paragraph', 'content': 'This vulnerability involves cross-site scripting (XSS) through unsanitized JSON parameters in HTTP request bodies related to events, tasks, and contacts categories in SOGo before version 5.12.5.'}, {'type': 'paragraph', 'content': 'Detection can focus on monitoring HTTP requests to the SOGo server for suspicious or malicious HTML or script content embedded in JSON parameters of requests handling events, tasks, or contacts.'}, {'type': 'paragraph', 'content': 'Since the vulnerability arises from unsanitized input in HTTP request bodies, you can use network traffic inspection tools or web application firewalls (WAF) to look for payloads containing script tags or HTML injections in JSON fields.'}, {'type': 'paragraph', 'content': 'Example commands to detect suspicious payloads might include using tools like tcpdump or tshark to capture HTTP POST requests to the SOGo server and then grep for suspicious patterns.'}, {'type': 'list_item', 'content': "tcpdump -A -s 0 'tcp port 80 and (((ip dst <SOGo_IP>) and (tcp[((tcp[12:1] & 0xf0) >> 2):4] = 0x504f5354))' | grep -iE '<script|<img|onerror|javascript:'"}, {'type': 'list_item', 'content': 'tshark -Y \'http.request.method == "POST" && ip.dst == <SOGo_IP>\' -T fields -e http.file_data | grep -iE \'<script|<img|onerror|javascript:\''}, {'type': 'paragraph', 'content': 'Replace <SOGo_IP> with the IP address of your SOGo server. These commands filter HTTP POST requests and search for common XSS payload indicators in the request body.'}] [1]

Useful 0 Not Useful 0

Mitigation Strategies

The primary mitigation step is to upgrade SOGo to version 5.12.5 or later, where the vulnerability has been fixed by sanitizing JSON input parameters before parsing.

If immediate upgrade is not possible, consider implementing web application firewall (WAF) rules to block or sanitize HTTP requests containing suspicious HTML or script content in JSON parameters related to events, tasks, and contacts.

Additionally, monitor and restrict access to the SOGo server to trusted users and networks to reduce the risk of exploitation.

Useful 0 Not Useful 0