CVE-2025-21088
MEDIUM6.5EPSS 0.18%Mattermost Incorrect Type Conversion or Cast
Published: 1/15/2025Modified: 2/4/2026
Description
Mattermost versions 10.2.x <= 10.2.0, 9.11.x <= 9.11.5, 10.0.x <= 10.0.3, 10.1.x <= 10.1.3 fail to properly validate the style of proto supplied to an action's style in post.props.attachments, which allows an attacker to crash the frontend via crafted malicious input.
Affected packages (5)
- Go/github.com/mattermost/mattermost-server>= 9.11.0+incompatible, < 9.11.6+incompatible, >= 10.0.0+incompatible, < 10.0.4+incompatible, >= 10.1.0+incompatible, < 10.1.4+incompatible, >= 10.2.0+incompatible, < 10.2.1+incompatible
- Go/github.com/mattermost/mattermost-server/v5from 0
- Go/github.com/mattermost/mattermost-server/v6from 0
- Go/github.com/mattermost/mattermost/server/v8>= 10.2.0, < 10.2.1
- Go/github.com/mattermost/mattermost/server/v8from 0, < 8.0.0-20241127161322-25ff7a3779a5
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |