{"id":"CVE-2024-39836","aliases":["EUVD-2024-2555","GHSA-c6vp-jjgv-38wj","GO-2024-3096"],"status":"published","title":"Munged email address used for password resets and notifications","description":"Mattermost versions 9.9.x \u003c= 9.9.1, 9.5.x \u003c= 9.5.7, 9.10.x \u003c= 9.10.0 and 9.8.x \u003c= 9.8.2 fail to  ensure that remote/synthetic users cannot create sessions or reset passwords, which allows the munged email addresses, created by shared channels, to be used to receive email notifications and to reset passwords, when they are valid, functional emails.","severity":{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00261,"percentile":0.18051,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-693"],"published":"2024-08-22T06:27:09Z","modified":"2026-10-28T02:30:42Z","fixes":[{"ecosystem":"Go","package":"github.com/mattermost/mattermost/server/v8","fixed_in":["9.9.2","9.5.8","9.10.1","9.8.3"],"sources":["ghsa","osv"]},{"ecosystem":"Go","package":"github.com/mattermost/mattermost-server","fixed_in":["9.5.8+incompatible","9.8.3+incompatible","9.9.2+incompatible","9.10.1+incompatible"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"Go","package":"github.com/mattermost/mattermost/server/v8","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.9.0"},{"fixed":"9.9.2"}]}]},{"source":"ghsa","ecosystem":"Go","package":"github.com/mattermost/mattermost/server/v8","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.5.0"},{"fixed":"9.5.8"}]}]},{"source":"ghsa","ecosystem":"Go","package":"github.com/mattermost/mattermost/server/v8","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.10.0"},{"fixed":"9.10.1"}]}]},{"source":"ghsa","ecosystem":"Go","package":"github.com/mattermost/mattermost/server/v8","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.8.0"},{"fixed":"9.8.3"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/mattermost/mattermost/server/v8","ranges":[{"type":"SEMVER","events":[{"introduced":"9.9.0"},{"fixed":"9.9.2"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/mattermost/mattermost/server/v8","ranges":[{"type":"SEMVER","events":[{"introduced":"9.5.0"},{"fixed":"9.5.8"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/mattermost/mattermost/server/v8","ranges":[{"type":"SEMVER","events":[{"introduced":"9.10.0"},{"fixed":"9.10.1"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/mattermost/mattermost/server/v8","ranges":[{"type":"SEMVER","events":[{"introduced":"9.8.0"},{"fixed":"9.8.3"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/mattermost/mattermost-server","ranges":[{"type":"SEMVER","events":[{"introduced":"9.5.0+incompatible"},{"fixed":"9.5.8+incompatible"},{"introduced":"9.8.0+incompatible"},{"fixed":"9.8.3+incompatible"},{"introduced":"9.9.0+incompatible"},{"fixed":"9.9.2+incompatible"},{"introduced":"9.10.0+incompatible"},{"fixed":"9.10.1+incompatible"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/mattermost/mattermost-server/v5","ranges":[{"type":"SEMVER","events":[{"introduced":"0"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/mattermost/mattermost-server/v6","ranges":[{"type":"SEMVER","events":[{"introduced":"0"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/mattermost/mattermost/server/v8","ranges":[{"type":"SEMVER","events":[{"introduced":"0"}]}]}],"products":[{"vendor":"mattermost","product":"mattermost"}],"references":[{"url":"https://mattermost.com/security-updates","tags":["Vendor Advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2024-39836","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-c6vp-jjgv-38wj","tags":["advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/39xxx/CVE-2024-39836.json","tags":["advisory"]},{"url":"https://github.com/mattermost/mattermost","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2024-39836","title":"Munged email address used for password resets and notifications","description":"Mattermost versions 9.9.x \u003c= 9.9.1, 9.5.x \u003c= 9.5.7, 9.10.x \u003c= 9.10.0 and 9.8.x \u003c= 9.8.2 fail to  ensure that remote/synthetic users cannot create sessions or reset passwords, which allows the munged email addresses, created by shared channels, to be used to receive email notifications and to reset passwords, when they are valid, functional emails.","status":"published","published":"2024-08-22T06:27:09.829Z","modified":"2024-08-22T16:39:21.881Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-693"],"updated_at":"2026-11-02T14:34:18.951288Z"}],"euvd":[{"id":"EUVD-2024-2555","description":"Mattermost versions 9.9.x \u003c= 9.9.1, 9.5.x \u003c= 9.5.7, 9.10.x \u003c= 9.10.0 and 9.8.x \u003c= 9.8.2 fail to  ensure that remote/synthetic users cannot create sessions or reset passwords, which allows the munged email addresses, created by shared channels, to be used to receive email notifications and to reset passwords, when they are valid, functional emails.","status":"published","published":"2024-08-22T06:27:09Z","modified":"2024-08-22T16:39:21Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-03T00:56:13.216602Z"}],"ghsa":[{"id":"GHSA-c6vp-jjgv-38wj","title":"Mattermost allows remote/synthetic users to create sessions, reset passwords","description":"Mattermost versions 9.9.x \u003c= 9.9.1, 9.5.x \u003c= 9.5.7, 9.10.x \u003c= 9.10.0 and 9.8.x \u003c= 9.8.2 fail to  ensure that remote/synthetic users cannot create sessions or reset passwords, which allows the munged email addresses, created by shared channels, to be used to receive email notifications and to reset passwords, when they are valid, functional emails.","status":"published","published":"2024-08-22T09:30:32Z","modified":"2024-08-23T21:17:15Z","cvss":[{"version":"4.0","score":6.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","level":"medium"},{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-693"],"updated_at":"2026-11-02T14:38:00.257632Z"}],"nvd":[{"id":"CVE-2024-39836","description":"Mattermost versions 9.9.x \u003c= 9.9.1, 9.5.x \u003c= 9.5.7, 9.10.x \u003c= 9.10.0 and 9.8.x \u003c= 9.8.2 fail to  ensure that remote/synthetic users cannot create sessions or reset passwords, which allows the munged email addresses, created by shared channels, to be used to receive email notifications and to reset passwords, when they are valid, functional emails.","status":"published","published":"2024-08-22T07:15:03.96Z","modified":"2026-06-17T07:42:53.517Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-693"],"updated_at":"2026-11-02T14:10:19.870727Z"}],"osv":[{"id":"CVE-2024-39836","title":"Munged email address used for password resets and notifications","description":"Mattermost versions 9.9.x \u003c= 9.9.1, 9.5.x \u003c= 9.5.7, 9.10.x \u003c= 9.10.0 and 9.8.x \u003c= 9.8.2 fail to  ensure that remote/synthetic users cannot create sessions or reset passwords, which allows the munged email addresses, created by shared channels, to be used to receive email notifications and to reset passwords, when they are valid, functional emails.","status":"published","published":"2024-08-22T06:27:09.829Z","modified":"2026-10-28T02:30:42.085184973Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-693"],"updated_at":"2026-11-02T15:44:41.618074Z"},{"id":"GHSA-c6vp-jjgv-38wj","title":"Mattermost allows remote/synthetic users to create sessions, reset passwords","description":"Mattermost versions 9.9.x \u003c= 9.9.1, 9.5.x \u003c= 9.5.7, 9.10.x \u003c= 9.10.0 and 9.8.x \u003c= 9.8.2 fail to  ensure that remote/synthetic users cannot create sessions or reset passwords, which allows the munged email addresses, created by shared channels, to be used to receive email notifications and to reset passwords, when they are valid, functional emails.","status":"published","published":"2024-08-22T09:30:32Z","modified":"2024-08-30T17:42:33.698195Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"},{"version":"4.0","score":6.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-693"],"updated_at":"2026-11-02T15:46:44.571161Z"},{"id":"GO-2024-3096","title":"Mattermost allows remote/synthetic users to create sessions, reset passwords in github.com/mattermost/mattermost-server","description":"Mattermost allows remote/synthetic users to create sessions, reset passwords in github.com/mattermost/mattermost-server","status":"published","published":"2024-08-30T17:18:07Z","modified":"2026-03-03T04:55:46.625208Z","updated_at":"2026-11-02T15:47:01.453823Z"}]}}