{"action":"Upgrade github.com/mattermost/mattermost-server to 10.11.15 or later.","affected":[{"fixed":"11.6.1","introduced":"11.6.0"},{"fixed":"11.5.4","introduced":"11.5.0"},{"fixed":"11.4.5","introduced":"11.4.0"},{"fixed":"10.11.15","introduced":"10.11.0"}],"component":"github.com/mattermost/mattermost-server","cve_ids":["CVE-2026-28735"],"ecosystem":"Go","epss":0.00138,"exploited":false,"fixed_versions":["11.6.1","11.5.4","11.4.5","10.11.15"],"ghsa_id":"GHSA-r5vf-grcx-5vqp","id":"tcs_01M5KFM4P7CQ6X2XCJKZ6RPVXD","modified_at":"2026-07-07T16:11:04.161097812Z","published_at":"2026-05-26T13:30:19Z","references":["https://osv.dev/vulnerability/GHSA-r5vf-grcx-5vqp","https://nvd.nist.gov/vuln/detail/CVE-2026-28735","https://github.com/mattermost/mattermost-plugin-github/commit/6e6b740c4852cdfa136ee0ced160da832285c353","https://github.com/mattermost/mattermost","https://mattermost.com/security-updates"],"severity":{"label":"medium","score":5.4},"sources":[{"source":"osv","source_id":"GHSA-r5vf-grcx-5vqp","url":"https://osv.dev/vulnerability/GHSA-r5vf-grcx-5vqp"}],"summary":"Mattermost allows authenticated users to gain access to private repositories"}