CVE-2025-21088 — Incorrect Type Conversion or Cast in Mattermost Mattermost-server

CWE-704 — Incorrect Type Conversion or Cast5 documents4 sources
Severity
6.5MEDIUMNVD
EPSS
0.2%
top 60.64%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
4
Github.com Mattermost Mattermost-serverGithub.com Mattermost Mattermost Server V8Mattermost Server+1 more
Timeline
PublishedJan 15
Latest updateJan 16

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.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HExploitability: 2.8 | Impact: 3.6

Affected Packages4 packages

▶NVDmattermost/mattermost_server9.11.0 — 9.11.6+3
▶Gogithub.com/mattermost_mattermost-server9.11.0+incompatible — 9.11.6+incompatible+3
▶CVEListV5mattermost/mattermost9.11.0 — 9.11.5+3

🔴Vulnerability Details

4
OSV
Mattermost Incorrect Type Conversion or Cast in github.com/mattermost/mattermost-server↗2025-01-16
▶
OSV
Mattermost Incorrect Type Conversion or Cast↗2025-01-15
▶
CVEList
WebApp crash via improper validation of proto style in attachments↗2025-01-15
▶
GHSA
Mattermost Incorrect Type Conversion or Cast↗2025-01-15
▶
CVE-2025-21088 — Incorrect Type Conversion or Cast | cvebase