This vulnerability allows Mattermost versions 9.11.x <= 9.11.6 and 10.4.x <= 10.4.1 to fail in invalidating all active sessions when a user is converted to a bot. This flaw enables the converted user to escalate their privileges, depending on the permissions granted to the bot. The severity level is categorized as low, with a CVSS score of 3.1, which indicates a manageable risk but still requires attention.
Risk to organizations includes potential unauthorized access and privilege escalation, which could lead to the compromise of sensitive information or system integrity. Given the nature of this vulnerability, organizations should prioritize patching during their routine maintenance.
Currently, there are no known exploits confirmed for this vulnerability. However, organizations should remain vigilant and monitor for any potential developments regarding exploit availability or active exploitation.
Organizations should address this vulnerability in their priority patch cycle to mitigate the risk of exploitation. As the threat landscape evolves, timely remediation becomes critical to maintaining a secure environment.
Vulnerability Details
The vulnerability is officially described as follows: 'Mattermost versions 9.11.x <= 9.11.6, 10.4.x <= 10.4.1 fail to invalidate all active sessions when converting a user to a bot, which allows the converted user to escalate their privileges depending on the permissions granted to the bot.' The vulnerability type is categorized as a privilege escalation issue, and it has a CVSS score of 3.1, indicating low severity.
The affected product is the 'mattermost_server' from the vendor Mattermost. The vulnerability was published on February 24, 2025, and is analyzed as part of their security updates.
Technical Analysis
The root cause of this vulnerability stems from the failure to invalidate sessions associated with a user being converted to a bot account. This allows potential privilege escalation, as the converted user retains access rights based on their previous role.
The attack vector is classified as network-based, with a high attack complexity due to low privileges required to exploit this vulnerability. There is no user interaction required, making it easier for attackers to leverage this issue.
The confidentiality impact is low, while both integrity and availability impacts are none. This indicates that while the risk of unauthorized access exists, it does not directly compromise the integrity or availability of the system.
Risk & Impact Analysis
Real-world deployment risk associated with this vulnerability is particularly concerning in environments where users have elevated privileges. The potential for privilege escalation can increase the blast radius of an attack, leading to unauthorized access to sensitive data or disruption of services.
Organizations must consider the implications of this vulnerability on their overall security posture. The need for timely remediation is evident, particularly given the evolving nature of exploit techniques that may emerge in the future.
Based on the low CVSS score and the absence of confirmed exploits, the urgency for addressing this vulnerability is moderate. Organizations should schedule remediation during their next maintenance window, ensuring that necessary patches are applied.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | Yes |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The vulnerable versions of Mattermost include: 9.11.x <= 9.11.6 and 10.4.x <= 10.4.1. All versions prior to the vendor patch are affected.
Mitigation & Remediation
Organizations should apply the latest patches and updates for Mattermost to remediate this vulnerability. Ensure to upgrade to at least version 9.11.7 or 10.4.2 to eliminate the risk. If immediate patching is not possible, organizations should implement workarounds such as disabling bot conversions until a patch can be applied.
Configuration hardening and network controls should be enforced to minimize exposure to potential exploitation. Monitoring recommendations include reviewing logs for unusual account activities and session management anomalies.
For further guidance, organizations may benefit from consulting penetration testing services such as penetration testing to validate their security posture.
Detection Guidance
Organizations should monitor logs for indicators of unauthorized access attempts and session anomalies. Behavioral changes in user accounts, particularly those converted to bots, should be flagged for further investigation.
AppSecure Threat Intelligence Insight
This vulnerability highlights the importance of robust session management in preventing privilege escalation. Security teams should ensure that session invalidation processes are enforced consistently across all user roles.
As organizations increasingly rely on bot integrations, understanding the implications of session management failures becomes critical. Continuous security assessments and proactive vulnerability management can help mitigate risks associated with evolving attack vectors.
For more in-depth strategies, security teams can refer to our guides on vulnerability management and penetration testing methodology for effective security practices.
Finally, organizations should remain informed about emerging vulnerabilities and the evolving threat landscape through continuous monitoring and engagement with security communities.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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