CVE-2016-11063: Mattermost Server vulnerable to Cross-site Scripting through file preview feature

May 24, 2022 (updated October 21, 2025)

An issue was discovered in Mattermost Server before 3.5.1. XSS can occur via file preview.

References

github.com/advisories/GHSA-cffj-7w5c-jqjh
github.com/mattermost/mattermost
github.com/mattermost/mattermost/commit/48533aa483879a19fdd2c1e09c596aa6c028d439
mattermost.com/security-updates
nvd.nist.gov/vuln/detail/CVE-2016-11063

Code Behaviors & Features

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