CVE catalog
CVE-2026-3590
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 ac
- Severity
- Medium · CVSS 6.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.15% · Oct 25, 2026
A flaw was found in Mattermost. Mattermost fails 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. Red Hat Product Security has determined that this vulnerability does not affect any currently supported Red Hat product. This assessment may evolve based on further analysis and discovery. For more information about this vulnerability and the products it affects, please see the linked references. The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Cpe | mattermost_server | Not reported | 10.11.13 | fixed |
| Cpe | mattermost_server | Not reported | 11.3.3 | fixed |
| Cpe | mattermost_server | Not reported | 11.4.3 | fixed |
| Cpe | mattermost_server | Not reported | 11.5.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Cpe | mattermost_server | cpe | Not reported | 10.11.13 | Not reported | Not reported | Not reported |
| Cpe | mattermost_server | cpe | Not reported | 11.3.3 | Not reported | Not reported | Not reported |
| Cpe | mattermost_server | cpe | Not reported | 11.4.3 | Not reported | Not reported | Not reported |
| Cpe | mattermost_server | cpe | Not reported | 11.5.1 | Not reported | Not reported | Not reported |
OpenFactory catalog packages
No matching packages in this catalog.
Observed: