CVE-2026-14298
Medium
Description
Mattermost versions 11.9.x <= 11.9.0, 11.8.x <= 11.8.4, 11.7.x <= 11.7.7, 10.11.x <= 10.11.22 fail to limit decompressed content size and enforce the configured maximum file size in the Boards archive import handler, which allows an authenticated user to cause memory exhaustion or unbounded disk consumption via a crafted .boardarchive file uploaded to the import endpoint.. Mattermost Advisory ID: MMSA-2026-00713
SeverityMedium
CVSS6.5
Exploit probability—
Product
Mattermost Server
PublishedAug 13, 2026
First seenAug 13, 2026
Weakness typeCWE-409CWE-409
How to fix
Update
- mattermost mattermost_server10.11.23, 11.7.8, 11.8.5, 11.9.1 or later
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mattermost mattermost_server | 10.11.0 ≤ v < 10.11.23, 11.7.0 ≤ v < 11.7.8, 11.8.0 ≤ v < 11.8.5, 11.9.0 ≤ v < 11.9.1 | 10.11.23, 11.7.8, 11.8.5, 11.9.1 |
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