CVE-2025-22449 is classified as a low-severity vulnerability affecting Mattermost versions 9.11.x up to 9.11.5. This vulnerability allows team admins, who lack the necessary permissions to invite users, to invite users by manipulating the "allow_open_invite" field after making their team public. The CVSS score of 3.8 indicates a low risk, but organizations should still take heed of the potential implications.
The vulnerability's impact is primarily associated with its ability to undermine the invitation permission model within Mattermost. With an attack vector classified as network and low complexity, the exploitation does not require user interaction. However, it does necessitate high privileges for the attacker, limiting the potential blast radius but still posing a risk to organizational integrity.
Although there is no public exploit confirmed, organizations should remain vigilant. The urgency for defenders is moderate, as the risk to organizations includes unauthorized user access, which could lead to confidential information exposure.
Therefore, organizations using Mattermost versions affected by this vulnerability should prioritize patching immediately to prevent unauthorized access and ensure compliance with security policies.
Vulnerability Details
The official description of this vulnerability states that Mattermost versions 9.11.x (up to 9.11.5) fail to enforce invite permissions. The CVSS 3.1 vector string indicates a low severity level with a base score of 3.8, which is interpreted as a low-risk vulnerability. The affected product, Mattermost Server, has been analyzed and identified as having a CWE classification of CWE-863, indicating an issue with authorization.
Technical Analysis
The root cause of CVE-2025-22449 lies in the failure of Mattermost to enforce proper invite permissions. This oversight enables team administrators, lacking the authority to invite users, to exploit the system by making their team public and altering the "allow_open_invite" field.
The attack vector is network-based, allowing an attacker to exploit this vulnerability remotely. The attack complexity is low, which means that an attacker could easily find and exploit this flaw without requiring advanced skills. However, it requires high privileges, which mitigates the risk to some extent.
User interaction is not required for the exploitation of this vulnerability. The confidentiality and integrity impacts are classified as low, indicating that while unauthorized access may occur, the overall damage could be limited. There is no impact on availability, making this vulnerability primarily focused on access control.
Risk & Impact Analysis
Risk to organizations includes unauthorized invitations to teams, leading to potential data exposure and security breaches. The vulnerability's low CVSS score suggests that while it may not be a critical threat, its exploitation could still have serious implications for user privacy and data integrity.
The blast radius potential is moderate, primarily affecting organizations that utilize Mattermost for team communication and collaboration. Organizations should assess their usage of this tool and determine the urgency of remediation based on their risk tolerance and exposure.
Given the low score on the EPSS risk context, the probability of exploitation remains low. However, organizations should not ignore this vulnerability and should consider patching it in their priority patch cycle.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected versions of Mattermost Server are those in the range 9.11.0 to 9.11.5, indicating that all versions prior to vendor patch are vulnerable. Organizations must ensure they are running a patched version to mitigate the risks associated with this vulnerability.
Mitigation & Remediation
Organizations should prioritize patching immediately to remediate this vulnerability. Upgrading to the latest version of Mattermost is essential to ensure that the invitation permissions are enforced correctly. If a patch is unavailable, organizations should consider implementing workarounds by reviewing team permission settings to minimize exposure.
Configuration hardening should be performed to ensure that sensitive settings, such as the "allow_open_invite" field, are not misconfigured. Additionally, network controls should be established to limit access to Mattermost servers and monitor for unusual activity.
Continuous security testing should be considered to validate the effectiveness of the remediation measures implemented.
Detection Guidance
To detect potential exploitation of this vulnerability, organizations should monitor logs for unusual user invitation patterns and changes to team settings. Behavioral anomalies that deviate from established user activity norms should be flagged and investigated.
Network signatures indicating unauthorized access attempts or changes to public team settings should be established as part of the monitoring strategy.
AppSecure Threat Intelligence Insight
The significance of CVE-2025-22449 lies in its representation of broader authorization issues within collaborative platforms. As security teams focus on tightening access controls, this vulnerability serves as a reminder of the importance of rigorous permission enforcement.
This incident highlights the potential risks associated with misconfigurations in team collaboration tools. Organizations should evaluate their security posture and ensure that proper controls are in place to prevent unauthorized access.
A vulnerability management program should be established to monitor and remediate vulnerabilities consistently.
Penetration testing methodology can also be employed to identify similar weaknesses in the security infrastructure.
API security testing techniques may further enhance the security posture against unauthorized access attempts.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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