CVE-2025-21088
WebApp crash via improper validation of proto style in attachments
Reported by mattermost · Published January 15, 2025
github.com/mattermost/mattermost/server/v8 is fixed in 10.2.1, 10.1.4, 10.0.4 and 2 more (Go Modules)
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.
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| github.com/mattermost/mattermost/server/v8 | Go Modules | 10.2.1, 10.1.4, 10.0.4, 9.11.6, 8.0.0-20241127161322-25ff7a3779a5 |
| mattermost_server | mattermost | 10.1.4, 10.0.4, 9.11.6 |
Risk scores
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Mattermost | Mattermost | 10.2.0, 9.11.0, 10.0.0 |
| chainguard | mattermost-10.0 | * |
| chainguard | mattermost-10.3 | * |
| chainguard | mattermost-10.1 | * |
| chainguard | mattermost-fips-10.5 | * |
| wolfi | mattermost-10.5 | * |
| Mattermost | Mattermost | 10.3.0, 10.0.0, 10.1.4 |
| wolfi | mattermost-10.1 | * |
| chainguard | mattermost-9.11 | * |
| wolfi | mattermost-10.0 | * |
| chainguard | mattermost-10.4 | * |
| chainguard | mattermost-10.5 | * |
| chainguard | mattermost-fips-10.7 | 0 |
| chainguard | mattermost-fips-9.11 | * |
| wolfi | mattermost-10.4 | * |
| github.com | mattermost/mattermost/server/v8 | 0, 10.2.0, 10.1.0 |
| wolfi | mattermost-10.2 | * |
| chainguard | mattermost-10.2 | * |
| chainguard | mattermost-fips-10.6 | * |
| wolfi | mattermost-10.3 | * |
Timeline
- Jan 15, 2025 CVE Published
- Jan 15, 2025 PoC Published
- Jan 15, 2025 CVE Updated
- Jan 16, 2025 EPSS Score (30 in total, the first dated here)
- Apr 6, 2025 Coalition ESS Score (13 in total, the first dated here)
- Mar 21, 2026 Security Advisory
Query this with the API
The same record, from the CLI:
vulnetix vdb vuln CVE-2025-21088
vulnetix vdb fixes CVE-2025-21088Or with curl, using the org id and key from your account page:
curl -s -H "Authorization: ApiKey ${VULNETIX_ORG_ID}:${VULNETIX_API_KEY}" \
"https://api.vdb.vulnetix.com/v2/vuln/CVE-2025-21088/fixes/registry"The Community plan is free and allows 50 queries a day. Get a free API key · API quickstart