Vulnerability DatabaseCVE-2026-10819
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CVE-2026-10819
Published:July 27, 2026
Updated:August 06, 2026
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 Packages
https://github.com/mattermost/mattermost.git (GITHUB):
Affected version(s) >=v11.8.0 <v11.8.2
Fix Suggestion:
Update to version v11.8.2
https://github.com/mattermost/mattermost.git (GITHUB):
Affected version(s) >=v11.7.0 <v11.7.5
Fix Suggestion:
Update to version v11.7.5
https://github.com/mattermost/mattermost.git (GITHUB):
Affected version(s) >=v10.11.0 <v10.11.21
Fix Suggestion:
Update to version v10.11.21
https://github.com/mattermost/mattermost.git (GITHUB):
Affected version(s) >=v11.6.0 <v11.6.6
Fix Suggestion:
Update to version v11.6.6
github.com/mattermost/mattermost (GO):
Affected version(s) >=v11.7.1 <v11.7.5+incompatible
Fix Suggestion:
Update to version v11.7.5+incompatible
github.com/mattermost/mattermost (GO):
Affected version(s) >=v11.6.1-rc1 <v11.6.6+incompatible
Fix Suggestion:
Update to version v11.6.6+incompatible
github.com/mattermost/mattermost (GO):
Affected version(s) >=v10.11.0+incompatible <v10.11.21+incompatible
Fix Suggestion:
Update to version v10.11.21+incompatible
github.com/mattermost/mattermost (GO):
Affected version(s) =v11.8.1 <v11.8.2+incompatible
Fix Suggestion:
Update to version v11.8.2+incompatible
Related Resources (3)
https://nvd.nist.gov/vuln/detail/CVE-2026-10819
https://mattermost.com/security-updates
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/10xxx/CVE-2026-10819.json
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CVSS v4
Base Score:
7.1
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Improper Handling of Highly Compressed Data (Data Amplification)
CWE-409
EPSS
Base Score:
0.24