Arbitrary File Upload Affecting github.com/mattermost/mattermost/server/platform/services/sharedchannel package, versions >=9.11.0 <9.11.18>=10.5.0 <10.5.9>=10.8.0 <10.8.4>=10.9.0 <10.9.3>=10.10.0 <10.10.1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-GOLANG-GITHUBCOMMATTERMOSTMATTERMOSTSERVERPLATFORMSERVICESSHAREDCHANNEL-12148192
- published22 Aug 2025
- disclosed21 Aug 2025
- creditdaw10
Introduced: 21 Aug 2025
NewCVE-2025-49222 (opens in a new tab)How to fix?
Upgrade github.com/mattermost/mattermost/server/platform/services/sharedchannel to version 9.11.18, 10.5.9, 10.8.4, 10.9.3, 10.10.1 or higher.
Overview
Affected versions of this package are vulnerable to Arbitrary File Upload due to improper validation of upload types in remote cluster upload sessions. An attacker with system admin privileges can gain unauthorized access to sensitive files by uploading non-attachment file types through shared channels, potentially placing them in arbitrary filesystem directories.