CVE-2026-20719
Fixed in a distro release EPSS <1%CVSS 4.3
Mattermost versions 11.4.x <= 11.4.0, 11.3.x <= 11.3.1, 11.2.x <= 11.2.3, 10.11.x <= 10.11.11 fail to prevent rendering of external SVGs on link embeds which allows unauthenticated users to crash the Mattermost webapp and desktop app via creating an issue or PR on GitHub.. Mattermost Advisory ID: MMSA-2026-00595
Products: Mattermost
Fixed upstream
| Ecosystem | Package | Fixed in |
|---|---|---|
| Go | github.com/mattermost/mattermost-server | 10.11.2+incompatible |
| Go | github.com/mattermost/mattermost-server | 11.2.4+incompatible |
| Go | github.com/mattermost/mattermost-server | 11.3.2+incompatible |
| Go | github.com/mattermost/mattermost-server | 11.4.1+incompatible |
| Go | github.com/mattermost/mattermost-server/v5 | no fix |
| Go | github.com/mattermost/mattermost-server/v6 | no fix |
| Go | github.com/mattermost/mattermost/server/v8 | 11.4.1 |
| Go | github.com/mattermost/mattermost/server/v8 | 11.3.2 |
| Go | github.com/mattermost/mattermost/server/v8 | 11.2.4 |
| Go | github.com/mattermost/mattermost/server/v8 | 8.0.0-20260217110922-b7d4a1f1f59b |
| Go | github.com/mattermost/mattermost/server/v8 | 10.11.2 |
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| openSUSE Leap 16.0 | govulncheck-vulndb | 0.0.20260723T184607-160000.1.1 |