CVSS 3.1
4.3 mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:NCVE-2026-3636
Medium (4.3) in mattermost mattermost server. EPSS 0.2% chance of exploitation in the next 30 days. Fixed in github.com/mattermost/mattermost-server 10.11.15, 10.11.15+incompatible, 11.4.5.
Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to sanitize team member data when returned via API to users without elevated permissions which allows a user without permissions to get data about team members roles via invoking various team API endpoints.. Mattermost Advisory ID: MMSA-2026-00626
Severity
- EPSS
- 0.2% chance of exploitation in the next 30 days; higher than 8% of CVEs (scores of 2026-10-31)
- CWE
- CWE-200
- Published
- Modified
- Record from
- the NVD, synced
Affected
- mattermost:mattermost_server
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-ffpr-pfr4-g354 | Go | github.com/mattermost/mattermost-server | >=11.6.0 <11.6.1 | 11.6.1 |
| GHSA-ffpr-pfr4-g354 | Go | github.com/mattermost/mattermost-server | >=11.5.0 <11.5.4 | 11.5.4 |
| GHSA-ffpr-pfr4-g354 | Go | github.com/mattermost/mattermost-server | >=11.4.0 <11.4.5 | 11.4.5 |
| GHSA-ffpr-pfr4-g354 | Go | github.com/mattermost/mattermost-server | >=10.11.0 <10.11.15 | 10.11.15 |
| GO-2026-5818 | Go | github.com/mattermost/mattermost-server | >=10.11.0+incompatible <10.11.15+incompatible >=11.4.0+incompatible <11.4.5+incompatible >=11.5.0+incompatible <11.5.4+incompatible >=11.6.0+incompatible <11.6.1+incompatible | 10.11.15+incompatible, 11.4.5+incompatible, 11.5.4+incompatible, 11.6.1+incompatible |