CVE-2025-71276 in SOGo
Summary
by MITRE • 03/22/2026
SOGo before 5.12.5 is prone to a XSS vulnerability with events, tasks, and contacts categories.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 03/27/2026
The vulnerability identified as CVE-2025-71276 affects SOGo versions prior to 5.12.5 and represents a cross-site scripting flaw that specifically targets event, task, and contact category handling within the application. This issue resides in the web interface's processing of user-supplied data related to calendar and contact management functionalities, creating a pathway for malicious actors to inject arbitrary script code into the application's response. The vulnerability manifests when users interact with categorized elements in the calendar and contact modules, where insufficient input validation and output sanitization allow attacker-controlled content to be executed in the context of other users' browsers.
The technical implementation of this XSS vulnerability stems from improper handling of user-provided category names and labels within SOGo's web application layer. When users create or modify events, tasks, or contacts, they can assign categories that are subsequently rendered in the user interface without adequate sanitization of potentially malicious input. This weakness allows attackers to craft category names containing script tags or other malicious code sequences that execute when other users view these categorized items. The vulnerability falls under CWE-79 - Improper Neutralization of Input During Web Page Generation, specifically targeting the rendering of user-controllable data in web contexts where script execution can occur.
The operational impact of this vulnerability extends beyond simple script injection, as it can enable attackers to perform various malicious activities including session hijacking, credential theft, and data exfiltration. An attacker who successfully exploits this vulnerability can execute scripts in the context of authenticated users, potentially gaining access to sensitive calendar data, contact information, and personal details stored within the SOGo application. This could lead to unauthorized access to business-critical information, disruption of calendar-based workflows, and potential lateral movement within organizational networks where SOGo serves as a collaborative platform. The vulnerability is particularly concerning in enterprise environments where SOGo is used for business collaboration and where calendar and contact data may contain sensitive corporate information.
Mitigation strategies for CVE-2025-71276 should prioritize immediate patching of affected SOGo installations to version 5.12.5 or later, which includes proper input sanitization and output encoding for category data. Organizations should also implement additional defensive measures such as content security policy headers to limit script execution capabilities, regular security scanning of web applications, and monitoring for suspicious user activity related to calendar and contact modifications. Network segmentation and access controls can help limit the potential impact if exploitation occurs, while user education regarding suspicious calendar entries and contact modifications can provide additional layers of defense. This vulnerability aligns with ATT&CK technique T1566.001 - Phishing: Spearphishing Attachment, as attackers may use this vulnerability to deliver malicious payloads through crafted calendar entries or contact information, and T1071.001 - Application Layer Protocol: Web Protocols, as the attack vector operates through standard web application interfaces. Organizations should also consider implementing web application firewalls and regular penetration testing to identify similar vulnerabilities in their collaborative platforms and web applications.