Vulnerability · Published Jan 15, 2025 · Assigned by Mattermost
CVE-2025-21088WebApp crash via improper validation of proto style in attachments
Medium 6.5
In plain English
A medium-severity security flaw in Mattermost from Mattermost. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 48% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.6%top 51.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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 & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/mattermost/mattermost-server | 10.0.4+incompatible, 10.1.4+incompatible, 10.2.1+incompatible, 9.11.6+incompatible | GO-2025-3393 |
| Go | github.com/mattermost/mattermost-server/v5 | no fix listed | GO-2025-3393 |
| Go | github.com/mattermost/mattermost-server/v6 | no fix listed | GO-2025-3393 |
| Go | github.com/mattermost/mattermost/server/v8 | 9.11.6 | GHSA-8j3q-gc9x-7972 |
| Go | github.com/mattermost/mattermost/server/v8 | 8.0.0-20241127161322-25ff7a3779a5 | GHSA-8j3q-gc9x-7972 |
| Go | github.com/mattermost/mattermost/server/v8 | 10.2.1 | GHSA-8j3q-gc9x-7972 |
| Go | github.com/mattermost/mattermost/server/v8 | 8.0.0-20241127161322-25ff7a3779a5 | GO-2025-3393 |
| Go | github.com/mattermost/mattermost/server/v8 | 10.1.4 | GHSA-8j3q-gc9x-7972 |
| Go | github.com/mattermost/mattermost/server/v8 | 10.0.4 | GHSA-8j3q-gc9x-7972 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mattermost | Mattermost | 10.2.09.11.0 – through 9.11.510.0.0 – through 10.0.310.1.0 – through 10.1.3 |
Weakness: CWE-704 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H