{"schemaVersion":3,"id":"CVE-2017-18871","aliases":["GHSA-jc6w-8r7f-vmp5","GO-2025-4184"],"status":"published","duplicateOf":null,"title":null,"description":"An issue was discovered in Mattermost Server before 4.5.0, 4.4.5, 4.3.4, and 4.2.2. It allows attackers to cause a denial of service (application crash) via an @ character before a JavaScript field name.","dates":{"published":"2020-06-19T16:51:40.000Z","modified":"2024-08-05T21:37:44.296Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.5,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"NVD","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":5,"severity":"medium","vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Go","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":10,"impact":6,"computed":true}]},"epss":{"probability":0.01124,"percentile":0.65748,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":0.00999999999999994,"baselineDate":"2026-09-19T00:00:00.000Z","baselineScore":0.01114},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.01114,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.01114,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.01114,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.01114,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.01114,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.01114,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.01114,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.01114,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.01114,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.01114,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.01124,"percentile":0.65748}],"last30":[{"date":"2026-09-19T00:00:00.000Z","score":0.01114,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.01114,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.01114,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.01114,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.01114,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.01124,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.01124,"percentile":0.65748}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[],"affected":[{"vendor":"github.com/mattermost","product":"mattermost-server","name":"github.com/mattermost/mattermost-server","label":"mattermost-server","ecosystem":"Go","cpePart":null,"purl":"pkg:golang/github.com/mattermost/mattermost-server","purlType":"golang","versions":[{"text":"< 4.2.2","noFixRecorded":false,"fixedIn":null},{"text":"≥ 4.3.0-rc1, < 4.3.4","noFixRecorded":false,"fixedIn":null},{"text":"≥ 4.4.0-rc1, < 4.4.5","noFixRecorded":false,"fixedIn":null},{"text":"≥ 4.5.0-rc1, < 4.5.0","noFixRecorded":false,"fixedIn":null},{"text":"≥ 4.5.0-rc1+incompatible, < 4.5.0+incompatible","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 4.2.2 | ≥ 4.3.0-rc1, < 4.3.4 | ≥ 4.4.0-rc1, < 4.4.5 | ≥ 4.5.0-rc1, < 4.5.0 | ≥ 4.5.0-rc1+incompatible, < 4.5.0+incompatible","eol":null,"hubHref":null},{"vendor":"mattermost","product":"mattermost_server","name":"mattermost server","label":"mattermost_server","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 4.2.2","noFixRecorded":false,"fixedIn":null},{"text":"≥ 4.3.0, < 4.3.4","noFixRecorded":false,"fixedIn":null},{"text":"≥ 4.4.0, < 4.4.5","noFixRecorded":false,"fixedIn":null},{"text":"4.5.0:rc1","noFixRecorded":false,"fixedIn":null},{"text":"4.5.0:rc2","noFixRecorded":false,"fixedIn":null},{"text":"4.5.0:rc3","noFixRecorded":false,"fixedIn":null},{"text":"4.5.0:rc4","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 4.2.2 | ≥ 4.3.0, < 4.3.4 | ≥ 4.4.0, < 4.4.5 | 4.5.0:rc1 | 4.5.0:rc2 | 4.5.0:rc3 | 4.5.0:rc4","eol":{"isEol":null,"eolDate":null,"matchMethod":"cpe","cycle":null,"product":{"name":"mattermost","label":"Mattermost","category":"server-app"}},"hubHref":"/vendor/mattermost/mattermost_server"}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://mattermost.com/security-updates/","label":"mattermost.com/security-updates/","hostname":"mattermost.com","tags":["X Refsource CONFIRM","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2017-18871","label":"nvd.nist.gov/vuln/detail/CVE-2017-18871","hostname":"nvd.nist.gov","tags":["Advisory"]},{"url":"https://github.com/mattermost/mattermost","label":"github.com/mattermost/mattermost","hostname":"github.com","tags":["PACKAGE"]},{"url":"https://mattermost.com/security-updates","label":"mattermost.com/security-updates","hostname":"mattermost.com","tags":["WEB"]},{"url":"https://github.com/advisories/GHSA-jc6w-8r7f-vmp5","label":"github.com/advisories/GHSA-jc6w-8r7f-vmp5","hostname":"github.com","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":["OPENSUSE-SU-2026:21483-1","SUSE-SU-2025:4395-1"],"duplicates":[],"related":["OPENSUSE-SU-2026:21483-1","SUSE-SU-2025:4395-1"]},"timeline":[{"kind":"published","date":"2020-06-19T16:51:40.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-08-05T21:37:44.296Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":30,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-19T17:24:22.789Z","stale":false,"partial":false}}