CVE-2026-10819
EUVD-2026-4925427.07.2026, 15:16
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
Affected Products (NVD)
| Vendor | Product | Version |
|---|---|---|
| mattermost | mattermost_server | 10.11.0 ≤ 𝑥 < 10.11.21 |
| mattermost | mattermost_server | 11.6.0 ≤ 𝑥 < 11.6.6 |
| mattermost | mattermost_server | 11.7.0 ≤ 𝑥 < 11.7.5 |
| mattermost | mattermost_server | 11.8.0 ≤ 𝑥 < 11.8.2 |
𝑥
= Vulnerable software versions
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
| Vendor | Product | Version | Source |
|---|---|---|---|
| mattermost | mattermost | 11.6.0 ≤ 𝑥 ≤ 11.6.5 | CNA |
| mattermost | mattermost | 10.11.0 ≤ 𝑥 ≤ 10.11.20 | CNA |
| mattermost | mattermost | 11.8.0 ≤ 𝑥 ≤ 11.8.1 | CNA |
| mattermost | mattermost | 11.7.0 ≤ 𝑥 ≤ 11.7.4 | CNA |
Common Weakness Enumeration
References