Mattermost Server vulnerable to Cross-site Scripting through file preview feature

Description

References

• nvd.nist.gov/vuln/detail/CVE-2016-11063 · ADVISORY
• mattermost/mattermost commit 48533aa · WEB
• mattermost/mattermost · WEB
• mattermost.com/security-updates · WEB
• mattermost.com/security-updates · Vendor Advisory
• GitHub Advisory GHSA-cffj-7w5c-jqjh · ADVISORY

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