Description
Mattermost versions 11.6.x <= 11.6.5, 10.11.x <= 10.11.20, 11.8.x <= 11.8.1, 11.7.x <= 11.7.4 fail to limit the number of frames and enforce the file size cap on animated GIF uploads, which allows an authenticated attacker to cause a denial of service via a crafted animated GIF uploaded as a custom emoji.. Mattermost Advisory ID: MMSA-2026-00695
CVSS 6.5EPSS 0.24%Risk 0.66
View source- Published
- 2026-07-27 15:16:46
- Affected versions
- <= 11.6.5, <= 10.11.20, <= 11.8.1, <= 11.7.4
- Type
- Web application
- Last modified
- 2026-08-03 15:23:50
- Vector
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H