{"id":"CVE-2025-21088","summary":"WebApp crash via improper validation of proto style in attachments","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":["GHSA-8j3q-gc9x-7972","GO-2025-3393"],"modified":"2026-07-15T02:13:51.566724161Z","published":"2025-01-15T15:51:49.474Z","related":["CGA-cgf5-4pp2-39xx","SUSE-SU-2025:0297-1","openSUSE-SU-2025:14704-1"],"database_specific":{"cna_assigner":"Mattermost","cwe_ids":["CWE-704"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21088.json","unresolved_ranges":[{"extracted_events":[{"introduced":"10.2.0"},{"last_affected":"10.2.0"},{"introduced":"9.11.0"},{"last_affected":"9.11.5"},{"introduced":"10.0.0"},{"last_affected":"10.0.3"},{"introduced":"10.1.0"},{"last_affected":"10.1.3"}],"source":"AFFECTED_FIELD"}]},"references":[{"type":"WEB","url":"https://mattermost.com/security-updates"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21088.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-21088"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/mattermost/mattermost","events":[{"introduced":"0bc2ddd42375a75ab14e63f038165150d4f07659"},{"fixed":"51ac054df0cf662ef3fa4657df4e058a33687135"},{"introduced":"2d83d21388f3111bffe4b1f63521b21d77ec2cef"},{"fixed":"ff3c76437efdef1fdf44f92434ac588e4d4e964c"},{"introduced":"50f91e2453188bbd0153db0e98714022db022a5c"},{"fixed":"90937a3832837b2d193c25aada123ee88942ebed"},{"introduced":"9a578312304f06bb423d668fa8f1b975dc1fe79a"},{"last_affected":"9a578312304f06bb423d668fa8f1b975dc1fe79a"}],"database_specific":{"extracted_events":[{"introduced":"9.11.0"},{"fixed":"9.11.6"},{"introduced":"10.0.0"},{"fixed":"10.0.4"},{"introduced":"10.1.0"},{"fixed":"10.1.4"},{"introduced":"10.2.0-NA"},{"last_affected":"10.2.0-NA"}],"source":["CPE_RANGE","CPE_STRING"],"cpe":["cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*","cpe:2.3:a:mattermost:mattermost_server:10.2.0:-:*:*:*:*:*:*"]}}],"versions":["10.2.0-NA","v9.11.6-rc2","v10.0.4-rc2","v10.1.4-rc1","v10.0.4-rc1","v9.11.6-rc1","v10.1.3","v10.0.3-rc1","v10.0.3","v9.11.5","v9.11.5-rc1","v10.1.3-rc1","v10.2.0-rc3","v10.2.0","v9.11.4","v10.0.2-rc2","v10.0.2","v10.0.2-rc1","v9.11.4-rc1","v10.1.2","v10.1.2-rc1","v10.0.1","v9.11.3","v9.11.3-rc2","v10.1.1-rc1","v10.1.1","v9.11.3-rc1","v10.0.1-rc1","v10.1.0-rc3","v10.1.0","@mattermost/types@10.1.0","@mattermost/client@10.1.0","v9.11.2","v9.11.2-rc2","v9.11.2-rc1","v10.0.0-rc4","v10.0.0","@mattermost/types@10.0.0","@mattermost/client@10.0.0","v9.11.1-rc1","v9.11.1","v9.11.0-rc3","v9.11.0","@mattermost/types@9.11.0","@mattermost/client@9.11.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-21088.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}