Vulnerabilities CVE-2026-10819

CVE-2026-10819

Medium

Open

TLP:CLEAR

Mattermost Server Denial of Service via Animated GIF Emoji Upload

NVD CVE.org

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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

Details

CVSS Score: 6.5
EPSS Score ⓘ: 0.24%

15.2th percentile
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Confidence: 90%
Published: Jul 27, 2026
Last Modified: Jul 27, 2026

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