Platform
go
Component
github.com/mattermost/mattermost-server
Fixed in
10.4.2
9.11.8
10.3.3
10.2.3
8.0.0-20250122165010-4ed702ccff4e
9.11.8+incompatible
9.11.8+incompatible
9.11.8+incompatible
9.11.8+incompatible
CVE-2025-20051 describes an Arbitrary File Access vulnerability discovered in Mattermost Server, a popular open-source communication platform. This vulnerability allows attackers to read arbitrary files on the server, potentially leading to data breaches and system compromise. The vulnerability impacts versions of Mattermost Server prior to 9.11.8+incompatible, and a patch has been released to address the issue.
The impact of this vulnerability is significant. An attacker who successfully exploits CVE-2025-20051 can read any file accessible by the Mattermost Server process. This includes configuration files, database backups, source code, and potentially even user data. The ability to read sensitive configuration files could reveal credentials or internal system details, facilitating further attacks. Exposure of database backups could lead to complete data compromise. The blast radius extends to any data stored or processed by the Mattermost Server instance.
CVE-2025-20051 was publicly disclosed on March 3, 2025. As of this date, there are no publicly known proof-of-concept exploits. The vulnerability's severity (CRITICAL) and ease of exploitation suggest a potential for active exploitation, although no confirmed campaigns have been reported. It is listed on the NVD database. The EPSS score is pending evaluation.
Exploit Status
EPSS
0.28% (51% percentile)
CISA SSVC
CVSS Vector
The primary mitigation for CVE-2025-20051 is to upgrade to Mattermost Server version 9.11.8+incompatible or later. If immediate upgrading is not possible, consider implementing temporary workarounds such as restricting file system access for the Mattermost Server process. Review and harden file permissions to limit the potential impact of a successful exploit. Monitor Mattermost Server logs for any unusual file access attempts. After upgrade, confirm the vulnerability is resolved by attempting to access a restricted file and verifying that access is denied.
Update Mattermost to the latest available version. See the Mattermost security advisory for more details and specific upgrade instructions.
Vulnerability analysis and critical alerts directly to your inbox.
CVE-2025-20051 is a critical vulnerability in Mattermost Server allowing attackers to read arbitrary files on the server, potentially exposing sensitive data. It affects versions before 9.11.8+incompatible.
If you are running Mattermost Server versions prior to 9.11.8+incompatible, you are affected by this vulnerability. Upgrade immediately to mitigate the risk.
The recommended fix is to upgrade to Mattermost Server version 9.11.8+incompatible or later. If upgrading is not immediately possible, implement temporary workarounds like restricting file system access.
As of March 3, 2025, there are no confirmed reports of active exploitation, but the vulnerability's severity suggests a potential for exploitation.
Refer to the official Mattermost security advisory for detailed information and updates: [https://mattermost.com/security/advisories](https://mattermost.com/security/advisories)
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