CVE-2025-21088

published 2025-01-15

CVE-2025-21088: 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…

Priority P3 35 medium 6.5 CVSS 3.1

AV N AC L PR L UI N S U C N I N A H

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

17 ranges

Vendor	Product	Version range	Fixed in
github.com	mattermost_mattermost-server	>= 10.0.0+incompatible < 10.0.4+incompatible	10.0.4+incompatible
github.com	mattermost_mattermost-server	>= 10.1.0+incompatible < 10.1.4+incompatible	10.1.4+incompatible
github.com	mattermost_mattermost-server	>= 10.2.0+incompatible < 10.2.1+incompatible	10.2.1+incompatible
github.com	mattermost_mattermost-server	>= 9.11.0+incompatible < 9.11.6+incompatible	9.11.6+incompatible
github.com	mattermost_mattermost_server_v8	>= 0 < 8.0.0-20241127161322-25ff7a3779a5	8.0.0-20241127161322-25ff7a3779a5
github.com	mattermost_mattermost_server_v8	>= 10.0.0 < 10.0.4	10.0.4
github.com	mattermost_mattermost_server_v8	>= 10.1.0 < 10.1.4	10.1.4
github.com	mattermost_mattermost_server_v8	>= 10.2.0 < 10.2.1	10.2.1
github.com	mattermost_mattermost_server_v8	>= 9.11.0 < 9.11.6	9.11.6
mattermost	mattermost	—	—
mattermost	mattermost	10.0.0 – 10.0.3	—
mattermost	mattermost	10.1.0 – 10.1.3	—
mattermost	mattermost	9.11.0 – 9.11.5	—
mattermost	mattermost_server	—	—
mattermost	mattermost_server	>= 10.0.0 < 10.0.4	10.0.4
mattermost	mattermost_server	>= 10.1.0 < 10.1.4	10.1.4
mattermost	mattermost_server	>= 9.11.0 < 9.11.6	9.11.6

Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.

CWE-704