CVSS 3.1
6.5 mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:NCVE-2026-3590
Medium (6.5) in mattermost mattermost server. EPSS 0.2% chance of exploitation in the next 30 days. Fixed in github.com/mattermost/mattermost/server/v8 8.0.0-20250723052842-4cb8d8940332.
Mattermost versions 10.11.x <= 10.11.12, 11.5.x <= 11.5.0, 11.4.x <= 11.4.2, 11.3.x <= 11.3.2 fail to enforce atomic single-use consumption of guest magic link tokens, which allows an attacker with access to a valid magic link to establish multiple independent authenticated sessions via concurrent requests.. Mattermost Advisory ID: MMSA-2026-00624
Severity
- EPSS
- 0.2% chance of exploitation in the next 30 days; higher than 4% of CVEs (scores of 2026-10-31)
- CWE
- CWE-367
- Published
- Modified
- Record from
- the NVD, synced
Affected
- mattermost:mattermost_server
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-mh4x-rmrx-3hp4 | Go | github.com/mattermost/mattermost/server/v8 | >=8.0.0-20250721062209-4952acea88ce <8.0.0-20250723052842-4cb8d8940332 | 8.0.0-20250723052842-4cb8d8940332 |
| GHSA-mh4x-rmrx-3hp4 | Go | github.com/mattermost/mattermost-server | >=10.11.0-rc1 <10.11.13 | 10.11.13 |
| GHSA-mh4x-rmrx-3hp4 | Go | github.com/mattermost/mattermost-server | >=11.5.0-rc1 <11.5.0 | 11.5.0 |
| GHSA-mh4x-rmrx-3hp4 | Go | github.com/mattermost/mattermost-server | >=11.4.0-rc1 <11.4.3 | 11.4.3 |
| GHSA-mh4x-rmrx-3hp4 | Go | github.com/mattermost/mattermost-server | >=11.3.0-rc1 <11.3.3 | 11.3.3 |
| GO-2026-5507 | Go | github.com/mattermost/mattermost-server | >=10.11.0-rc1+incompatible <10.11.13+incompatible >=11.3.0-rc1+incompatible <11.3.3+incompatible >=11.4.0-rc1+incompatible <11.4.3+incompatible >=11.5.0-rc1+incompatible <11.5.0+incompatible | 10.11.13+incompatible, 11.3.3+incompatible, 11.4.3+incompatible, 11.5.0+incompatible |
| GO-2026-5507 | Go | github.com/mattermost/mattermost-server/v5 | all versions | no fix published |
| GO-2026-5507 | Go | github.com/mattermost/mattermost-server/v6 | all versions | no fix published |
| GO-2026-5507 | Go | github.com/mattermost/mattermost/server/v8 | >=8.0.0-20250721062209-4952acea88ce <8.0.0-20250723052842-4cb8d8940332 | 8.0.0-20250723052842-4cb8d8940332 |