{"schema_version":"1.7.3","id":"GHSA-w6xh-c82w-h997","published":"2025-01-16T21:30:58Z","modified":"2026-02-04T03:58:16.413875Z","aliases":["CVE-2025-20621","GO-2025-3407"],"related":["CGA-c98v-56mv-hwh5"],"summary":"Mattermost webapp crash via a crafted post","details":"Mattermost versions 10.2.x <= 10.2.0, 9.11.x <= 9.11.5, 10.0.x <= 10.0.3, 10.1.x <= 10.1.3 fail to properly handle posts with attachments containing fields that cannot be cast to a String, which allows an attacker to cause the webapp to crash via creating and sending such a post to a channel.","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-w6xh-c82w-h997/GHSA-w6xh-c82w-h997.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":"<= 10.1.3","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/01/GHSA-w6xh-c82w-h997/GHSA-w6xh-c82w-h997.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":"<= 10.0.3","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/01/GHSA-w6xh-c82w-h997/GHSA-w6xh-c82w-h997.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":"<= 9.11.5","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/01/GHSA-w6xh-c82w-h997/GHSA-w6xh-c82w-h997.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-w6xh-c82w-h997/GHSA-w6xh-c82w-h997.json"}}],"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-20621"},{"type":"PACKAGE","url":"https://github.com/mattermost/mattermost"},{"type":"WEB","url":"https://mattermost.com/security-updates"}],"database_specific":{"cwe_ids":["CWE-1287"],"github_reviewed":true,"github_reviewed_at":"2025-01-16T23:09:09Z","nvd_published_at":"2025-01-16T19:15:29Z","severity":"MODERATE"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}