| Package | Affected versions | Patched versions |
|---|---|---|
| mattermost server | ≥ 10.11.0, < 10.11.21≥ 11.6.0, < 11.6.6≥ 11.7.0, < 11.7.5≥ 11.8.0, < 11.8.2 | 10.11.2111.6.611.7.511.8.2 |
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
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