VDB
GO-2026-4524
GO-2026-4524
PUBLISHED
CVSS 9.300000190734863 CRITICAL
Record from OSV · Published February 23, 2026
github.com/mattermost/mattermost/server/v8 is fixed in 8.0.0-20251210191531 (Go Modules)
Mattermost fails to sanitize sensitive data in WebSocket messages in github.com/mattermost/mattermost-server
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 | 8.0.0-20251210191531 |
Risk scores
CVSS 4.0
9.300000190734863
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Affected products
| Vendor | Product | Versions |
|---|---|---|
| github.com | mattermost/mattermost/server/v8 | 0 |
| github.com | mattermost/mattermost-server/v6 | 0 |
| github.com | mattermost/mattermost-server/v5 | 0 |
| github.com | mattermost/mattermost-server | 11.2.0+incompatible, 10.11.0+incompatible, 0 |
Timeline
- Feb 23, 2026 CVE Published
- Feb 23, 2026 CVE Updated
- Oct 14, 2026 Security Advisory
Query this with the API
The same record, from the CLI:
vulnetix vdb vuln GO-2026-4524
vulnetix vdb fixes GO-2026-4524Or 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/GO-2026-4524/fixes/registry"The Community plan is free and allows 50 queries a day. Get a free API key · API quickstart