{"id":"GHSA-8j3q-gc9x-7972","summary":"Mattermost Incorrect Type Conversion or Cast","details":"Mattermost versions 10.2.x \u003c= 10.2.0, 9.11.x \u003c= 9.11.5, 10.0.x \u003c= 10.0.3, 10.1.x \u003c= 10.1.3 fail to properly validate the style of proto supplied to an action's style in post.props.attachments, which allows an attacker to crash the frontend via crafted malicious input.","aliases":["CVE-2025-21088","GO-2025-3393"],"modified":"2026-07-17T21:08:29.990657578Z","published":"2025-01-15T18:30:56Z","database_specific":{"severity":"MODERATE","github_reviewed":true,"github_reviewed_at":"2025-01-15T20:06:54Z","nvd_published_at":"2025-01-15T16:15:32Z","cwe_ids":["CWE-704"]},"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-21088"},{"type":"PACKAGE","url":"https://github.com/mattermost/mattermost"},{"type":"WEB","url":"https://mattermost.com/security-updates"},{"type":"WEB","url":"https://pkg.go.dev/vuln/GO-2025-3393"}],"affected":[{"package":{"name":"github.com/mattermost/mattermost/server/v8","ecosystem":"Go","purl":"pkg:golang/github.com/mattermost/mattermost/server/v8"},"ranges":[{"type":"SEMVER","events":[{"introduced":"10.2.0"},{"fixed":"10.2.1"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/01/GHSA-8j3q-gc9x-7972/GHSA-8j3q-gc9x-7972.json"}},{"package":{"name":"github.com/mattermost/mattermost/server/v8","ecosystem":"Go","purl":"pkg:golang/github.com/mattermost/mattermost/server/v8"},"ranges":[{"type":"SEMVER","events":[{"introduced":"10.1.0"},{"fixed":"10.1.4"}]}],"database_specific":{"last_known_affected_version_range":"\u003c= 10.1.3","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/01/GHSA-8j3q-gc9x-7972/GHSA-8j3q-gc9x-7972.json"}},{"package":{"name":"github.com/mattermost/mattermost/server/v8","ecosystem":"Go","purl":"pkg:golang/github.com/mattermost/mattermost/server/v8"},"ranges":[{"type":"SEMVER","events":[{"introduced":"10.0.0"},{"fixed":"10.0.4"}]}],"database_specific":{"last_known_affected_version_range":"\u003c= 10.0.3","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/01/GHSA-8j3q-gc9x-7972/GHSA-8j3q-gc9x-7972.json"}},{"package":{"name":"github.com/mattermost/mattermost/server/v8","ecosystem":"Go","purl":"pkg:golang/github.com/mattermost/mattermost/server/v8"},"ranges":[{"type":"SEMVER","events":[{"introduced":"9.11.0"},{"fixed":"9.11.6"}]}],"database_specific":{"last_known_affected_version_range":"\u003c= 9.11.5","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/01/GHSA-8j3q-gc9x-7972/GHSA-8j3q-gc9x-7972.json"}},{"package":{"name":"github.com/mattermost/mattermost/server/v8","ecosystem":"Go","purl":"pkg:golang/github.com/mattermost/mattermost/server/v8"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"8.0.0-20241127161322-25ff7a3779a5"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/01/GHSA-8j3q-gc9x-7972/GHSA-8j3q-gc9x-7972.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}