GO-2026-4317
NoneCVSS
—
EPSS
—
Published
Jan 23, 2026
CISA due date
—
The record
Mattermost Server does not neutralize HTML content in an Email template field in github.com/mattermost/mattermost-server
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| Go | github.com/mattermost/mattermost-server | 0 | 4.0.5+incompatible |
| Go | github.com/mattermost/mattermost-server | 0 | 4.0.5 |
| Go | github.com/mattermost/mattermost-server | 4.1.0 | 4.1.1 |
| Go | github.com/mattermost/mattermost-server | 4.2.0-rc1 | 4.2.0 |
| go | github.com/mattermost/mattermost-server | 4.1.0 | 4.1.1 |
| go | github.com/mattermost/mattermost-server | 4.2.0-rc1 | 4.2.0 |
Related vulnerabilities
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- GO-2025-4260 Mattermost doesn't verify that post actions invoking `/share-issue-publicly` were created… Also affects github.com/mattermost/mattermost-server
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- GO-2026-4282 Mattermost Server is vulnerable to channel invisibility DoS via misformatted post in… Also affects github.com/mattermost/mattermost-server
- GO-2026-4496 Mattermost doesn't validate user permissions when creating Jira issues from Mattermost… Also affects github.com/mattermost/mattermost-server
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