{"cve":"CVE-2017-18873","nvd":{"published":"2020-06-19T18:15:10.600","modified":"2026-06-17T01:13:44.230","status":"Modified","description":"An issue was discovered in Mattermost Server before 4.3.0, 4.2.1, and 4.1.2. It allows attackers to cause a denial of service (channel invisibility) via a misformatted post.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","score":5.3},"cwes":["CWE-20"],"references":["https://mattermost.com/security-updates/","https://mattermost.com/security-updates/"],"products":["mattermost:mattermost_server"],"source":"nvd","synced_at":"2026-10-19T21:05:42.039641217+00:00"},"epss":{"cve":"CVE-2017-18873","score":0.01106,"percentile":0.65812,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-x6mw-hf2j-vqpc","url":"https://osv.dev/vulnerability/GHSA-x6mw-hf2j-vqpc","summary":"Mattermost Server is vulnerable to channel invisibility DoS via misformatted post","modified":"2026-02-26T18:56:01.453798Z","packages":[{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","purl":"pkg:golang/github.com/mattermost/mattermost-server","ranges":["<4.1.2-0.20171013141717-ee57a5829ab1"],"fixed":["4.1.2-0.20171013141717-ee57a5829ab1"]},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","purl":"pkg:golang/github.com/mattermost/mattermost-server","ranges":[">=4.2.0 <4.2.1-0.20171013140502-b3e4b0ac9168"],"fixed":["4.2.1-0.20171013140502-b3e4b0ac9168"]},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","purl":"pkg:golang/github.com/mattermost/mattermost-server","ranges":[">=4.3.0-rc1 <4.3.0"],"fixed":["4.3.0"]}]},{"id":"GO-2026-4282","url":"https://osv.dev/vulnerability/GO-2026-4282","summary":"Mattermost Server is vulnerable to channel invisibility DoS via misformatted post in github.com/mattermost/mattermost-server","modified":"2026-02-26T18:56:01.453798Z","packages":[{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","purl":"pkg:golang/github.com/mattermost/mattermost-server","ranges":["<4.1.2-0.20171013141717-ee57a5829ab1+incompatible",">=4.2.0+incompatible <4.2.1-0.20171013140502-b3e4b0ac9168+incompatible",">=4.3.0-rc1+incompatible <4.3.0+incompatible"],"fixed":["4.1.2-0.20171013141717-ee57a5829ab1+incompatible","4.2.1-0.20171013140502-b3e4b0ac9168+incompatible","4.3.0+incompatible"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}