{"cve":"CVE-2026-20719","nvd":{"published":"2026-03-25T17:16:30.307","modified":"2026-06-17T10:17:44.417","status":"Analyzed","description":"Mattermost versions 11.4.x <= 11.4.0, 11.3.x <= 11.3.1, 11.2.x <= 11.2.3, 10.11.x <= 10.11.11 fail to prevent rendering of external SVGs on link embeds which allows unauthenticated users to crash the Mattermost webapp and desktop app via creating an issue or PR on GitHub.. Mattermost Advisory ID: MMSA-2026-00595","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:H","score":7.5},"cwes":["CWE-754"],"references":["https://mattermost.com/security-updates"],"products":["mattermost:mattermost_server"],"source":"nvd","synced_at":"2026-10-19T22:28:18.033120106+00:00"},"epss":{"cve":"CVE-2026-20719","score":0.00358,"percentile":0.29535,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-86vc-mg26-fj6x","url":"https://osv.dev/vulnerability/GHSA-86vc-mg26-fj6x","summary":"Mattermost: Authenticated DoS through failure to prevent rendering of external SVGs on link embeds ","modified":"2026-06-25T19:56:32.224939542Z","packages":[{"ecosystem":"Go","name":"github.com/mattermost/mattermost/server/v8","purl":"pkg:golang/github.com/mattermost/mattermost/server/v8","ranges":[">=11.4.0-rc1 <11.4.1"],"fixed":["11.4.1"]},{"ecosystem":"Go","name":"github.com/mattermost/mattermost/server/v8","purl":"pkg:golang/github.com/mattermost/mattermost/server/v8","ranges":[">=11.3.0-rc1 <11.3.2"],"fixed":["11.3.2"]},{"ecosystem":"Go","name":"github.com/mattermost/mattermost/server/v8","purl":"pkg:golang/github.com/mattermost/mattermost/server/v8","ranges":[">=11.2.0-rc1 <11.2.4"],"fixed":["11.2.4"]},{"ecosystem":"Go","name":"github.com/mattermost/mattermost/server/v8","purl":"pkg:golang/github.com/mattermost/mattermost/server/v8","ranges":[">=8.0.0-20260105080200-d27a2195068d <8.0.0-20260217110922-b7d4a1f1f59b"],"fixed":["8.0.0-20260217110922-b7d4a1f1f59b"]},{"ecosystem":"Go","name":"github.com/mattermost/mattermost/server/v8","purl":"pkg:golang/github.com/mattermost/mattermost/server/v8","ranges":[">=10.11.0-rc1 <10.11.2"],"fixed":["10.11.2"]}]},{"id":"GO-2026-5245","url":"https://osv.dev/vulnerability/GO-2026-5245","summary":"Mattermost: Authenticated DoS through failure to prevent rendering of external SVGs on link embeds in github.com/mattermost/mattermost-server","modified":"2026-06-25T19:45:21.545233502Z","packages":[{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","purl":"pkg:golang/github.com/mattermost/mattermost-server","ranges":[">=10.11.0-rc1+incompatible <10.11.2+incompatible",">=11.2.0-rc1+incompatible <11.2.4+incompatible",">=11.3.0-rc1+incompatible <11.3.2+incompatible",">=11.4.0-rc1+incompatible <11.4.1+incompatible"],"fixed":["10.11.2+incompatible","11.2.4+incompatible","11.3.2+incompatible","11.4.1+incompatible"]},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server/v5","purl":"pkg:golang/github.com/mattermost/mattermost-server/v5","ranges":["all versions"],"fixed":[]},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server/v6","purl":"pkg:golang/github.com/mattermost/mattermost-server/v6","ranges":["all versions"],"fixed":[]},{"ecosystem":"Go","name":"github.com/mattermost/mattermost/server/v8","purl":"pkg:golang/github.com/mattermost/mattermost/server/v8","ranges":[">=8.0.0-20260105080200-d27a2195068d <8.0.0-20260217110922-b7d4a1f1f59b"],"fixed":["8.0.0-20260217110922-b7d4a1f1f59b"]}]}],"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."]}