{"id":"CVE-2024-1402","aliases":["BIT-mattermost-2024-1402","EUVD-2024-0474","GHSA-32h7-7j94-8fc2","GO-2024-2541"],"status":"published","title":"Denial of service in mattermost mobile apps and server via emoji reactions","description":"Mattermost fails to check if a custom emoji reaction exists when sending it to a post and to limit the amount of custom emojis allowed to be added in a post, allowing an attacker sending a huge amount of non-existent custom emojis in a post to crash the mobile app of a user seeing the post and to crash the server due to overloading when clients attempt to retrive the aforementioned post.","severity":{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.0052,"percentile":0.44437,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-400"],"published":"2024-02-09T15:09:18Z","modified":"2026-10-28T02:30:53Z","fixes":[{"ecosystem":"Go","package":"github.com/mattermost/mattermost/server/v8","fixed_in":["8.1.8","9.2.4","9.1.5"],"sources":["ghsa","osv"]},{"ecosystem":"Bitnami","package":"mattermost","fixed_in":["9.6.1"],"sources":["osv"]},{"ecosystem":"Go","package":"github.com/mattermost/mattermost-server","fixed_in":["9.1.5+incompatible","9.2.4+incompatible"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"Go","package":"github.com/mattermost/mattermost/server/v8","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.1.8"}]}]},{"source":"ghsa","ecosystem":"Go","package":"github.com/mattermost/mattermost/server/v8","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.2.0"},{"fixed":"9.2.4"}]}]},{"source":"ghsa","ecosystem":"Go","package":"github.com/mattermost/mattermost/server/v8","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.1.0"},{"fixed":"9.1.5"}]}]},{"source":"osv","ecosystem":"Bitnami","package":"mattermost","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"9.6.1"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/mattermost/mattermost/server/v8","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"8.1.8"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/mattermost/mattermost/server/v8","ranges":[{"type":"SEMVER","events":[{"introduced":"9.2.0"},{"fixed":"9.2.4"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/mattermost/mattermost/server/v8","ranges":[{"type":"SEMVER","events":[{"introduced":"9.1.0"},{"fixed":"9.1.5"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/mattermost/mattermost-server","ranges":[{"type":"SEMVER","events":[{"introduced":"9.1.0+incompatible"},{"fixed":"9.1.5+incompatible"},{"introduced":"9.2.0+incompatible"},{"fixed":"9.2.4+incompatible"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/mattermost/mattermost-server/v5","ranges":[{"type":"SEMVER","events":[{"introduced":"0"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/mattermost/mattermost-server/v6","ranges":[{"type":"SEMVER","events":[{"introduced":"0"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/mattermost/mattermost/server/v8","ranges":[{"type":"SEMVER","events":[{"introduced":"0"}]}]}],"products":[{"vendor":"mattermost","product":"mattermost"},{"vendor":"mattermost","product":"mattermost_server"}],"references":[{"url":"https://mattermost.com/security-updates","tags":["x_transferred","Vendor Advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2024-1402","tags":["web","advisory"]},{"url":"https://github.com/mattermost/mattermost/commit/64cb0ca8af2dbda1afcddd1604460591a4799b81","tags":["web"]},{"url":"https://github.com/mattermost/mattermost/commit/6d2440de9fd774b67e65e3aac4ab8b6ef9aba2d8","tags":["web"]},{"url":"https://github.com/mattermost/mattermost/commit/81190e2da128a6985914ea7023a69ac400513fc4","tags":["web"]},{"url":"https://github.com/advisories/GHSA-32h7-7j94-8fc2","tags":["advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/1xxx/CVE-2024-1402.json","tags":["advisory"]},{"url":"https://github.com/mattermost/mattermost","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2024-1402","title":"Denial of service in mattermost mobile apps and server via emoji reactions","description":"Mattermost fails to check if a custom emoji reaction exists when sending it to a post and to limit the amount of custom emojis allowed to be added in a post, allowing an attacker sending a huge amount of non-existent custom emojis in a post to crash the mobile app of a user seeing the post and to crash the server due to overloading when clients attempt to retrive the aforementioned post. \n\n","status":"published","published":"2024-02-09T15:09:18.157Z","modified":"2024-08-01T18:40:20.579Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"cna"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T14:34:18.597034Z"}],"euvd":[{"id":"EUVD-2024-0474","description":"Mattermost fails to check if a custom emoji reaction exists when sending it to a post and to limit the amount of custom emojis allowed to be added in a post, allowing an attacker sending a huge amount of non-existent custom emojis in a post to crash the mobile app of a user seeing the post and to crash the server due to overloading when clients attempt to retrive the aforementioned post. \n\n","status":"published","published":"2024-02-09T15:09:18Z","modified":"2024-08-01T18:40:20Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-03T03:50:41.523881Z"}],"ghsa":[{"id":"GHSA-32h7-7j94-8fc2","title":"Mattermost vulnerable to denial of service via large number of emoji reactions","description":"Mattermost fails to check if a custom emoji reaction exists when sending it to a post and to limit the amount of custom emojis allowed to be added in a post, allowing an attacker sending a huge amount of non-existent custom emojis in a post to crash the mobile app of a user seeing the post. Fetching posts with huge amounts of reactions results in Uncontrolled Resource Consumption.","status":"published","published":"2024-02-09T18:31:07Z","modified":"2025-02-19T15:34:18Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T14:38:32.275316Z"}],"nvd":[{"id":"CVE-2024-1402","description":"Mattermost fails to check if a custom emoji reaction exists when sending it to a post and to limit the amount of custom emojis allowed to be added in a post, allowing an attacker sending a huge amount of non-existent custom emojis in a post to crash the mobile app of a user seeing the post and to crash the server due to overloading when clients attempt to retrive the aforementioned post. \n\n","status":"published","published":"2024-02-09T16:15:07.88Z","modified":"2026-06-17T07:04:09.783Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"secondary"},{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L","level":"medium","assessor":"primary"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T14:09:35.738752Z"}],"osv":[{"id":"CVE-2024-1402","title":"Denial of service in mattermost mobile apps and server via emoji reactions","description":"Mattermost fails to check if a custom emoji reaction exists when sending it to a post and to limit the amount of custom emojis allowed to be added in a post, allowing an attacker sending a huge amount of non-existent custom emojis in a post to crash the mobile app of a user seeing the post and to crash the server due to overloading when clients attempt to retrive the aforementioned post. \n\n","status":"published","published":"2024-02-09T15:09:18.157Z","modified":"2026-10-28T02:30:53.49334783Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T15:44:37.917085Z"},{"id":"GHSA-32h7-7j94-8fc2","title":"Mattermost vulnerable to denial of service via large number of emoji reactions","description":"Mattermost fails to check if a custom emoji reaction exists when sending it to a post and to limit the amount of custom emojis allowed to be added in a post, allowing an attacker sending a huge amount of non-existent custom emojis in a post to crash the mobile app of a user seeing the post. Fetching posts with huge amounts of reactions results in Uncontrolled Resource Consumption.","status":"published","published":"2024-02-09T18:31:07Z","modified":"2026-09-10T03:50:05.197770614Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T15:46:35.050232Z"},{"id":"BIT-mattermost-2024-1402","description":"Mattermost fails to check if a custom emoji reaction exists when sending it to a post and to limit the amount of custom emojis allowed to be added in a post, allowing an attacker sending a huge amount of non-existent custom emojis in a post to crash the mobile app of a user seeing the post and to crash the server due to overloading when clients attempt to retrive the aforementioned post.","status":"published","published":"2024-03-06T10:56:11.998Z","modified":"2025-04-03T14:40:37.652Z","updated_at":"2026-11-02T15:28:33.072289Z"},{"id":"GO-2024-2541","title":"Mattermost vulnerable to denial of service via large number of emoji reactions in github.com/mattermost/mattermost-server","description":"Mattermost vulnerable to denial of service via large number of emoji reactions in github.com/mattermost/mattermost-server.\n\nNOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standard Go module versions.\n\n(If this is causing false-positive reports from vulnerability scanners, please suggest an edit to the report.)\n\nThe additional affected modules and versions are: github.com/mattermost/mattermost/server/v8 before v8.1.8.","status":"published","published":"2024-06-28T15:28:53Z","modified":"2026-02-04T04:21:26.11769Z","updated_at":"2026-11-02T15:47:01.185262Z"}]}}