CVE-2026-4053
Low
Description
Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13 fail to enforce the PostEditTimeLimit on non-message post fields which allows an authenticated user to modify post file attachments, props, and pin status after the edit window has expired via the post patch and update API endpoints.. Mattermost Advisory ID: MMSA-2026-00631
SeverityLow
CVSS3.1
Exploit probability—
Product
Mattermost Server
PublishedMay 15, 2026
First seenMay 15, 2026
Weakness typeCWE-672CWE-672
How to fix
Update
- mattermost mattermost_server10.11.14, 11.5.2 or later
- github.com/mattermost/mattermost-server11.5.2, 0.0.0-20260414103857-b21ef302025e, 11.5.2+incompatible or later
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mattermost mattermost_server | 10.11.0 ≤ v < 10.11.14, 11.5.0 ≤ v < 11.5.2 | 10.11.14, 11.5.2 |
| github.com/mattermost/mattermost-serverGo | 11.5.0 ≤ v < 11.5.2, 0.0.0-20250731163400-5b955468ea1e ≤ v < 0.0.0-20260414103857-b21ef302025e, 11.5.0+incompatible ≤ v < 11.5.2+incompatible | 11.5.2, 0.0.0-20260414103857-b21ef302025e, 11.5.2+incompatible |
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