CVE-2026-4273
Fixed in a distro release EPSS <1%CVSS 3.7
Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13 fail to validate that the RefreshedToken differs from the original invite token during remote cluster invite confirmation which allows an authenticated attacker to bypass token rotation and reuse the original invite token via sending a crafted invite confirmation with a RefreshedToken matching the original token. Mattermost Advisory ID: MMSA-2026-00575
Products: Mattermost
Fixed upstream
| Ecosystem | Package | Fixed in |
|---|---|---|
| Go | github.com/mattermost/mattermost-server | 5.3.2-0.20260313190740-742e0be95074 |
| Go | github.com/mattermost/mattermost-server | 10.11.14+incompatible |
| Go | github.com/mattermost/mattermost-server | 11.5.2+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 | 11.5.2 |
| Go | github.com/mattermost/mattermost/server/v8 | 10.11.14 |
| Go | github.com/mattermost/mattermost/server/v8 | 8.0.0-20260313190740-742e0be95074 |
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| openSUSE Leap 16.0 | govulncheck-vulndb | 0.0.20260723T184607-160000.1.1 |