Signal is active with 1 mentions in latest observed window
Recommended action window: Monitor and triage in normal cycle
NVD description
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
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
NONE
Momentum
STABLE
If you run products in this scope, you should treat this CVE as relevant to your environment.
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, … https://www.cve.org/CVERecord?id=CVE-2026-3590
Post summary
The text lists affected Mattermost versions and the flaw that tokens are not enforced as single-use, but it does not provide a PoC, exploit, patch, or evidence of active exploitation.
CVE-2026-3590 Concurrent Session Establishment via Unenforced Magic Link Token Consumption in Mattermost https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-3590
Post summary
A brief disclosure of CVE-2026-3590 in Mattermost mentioning the vulnerability type but offering no PoC, exploit, patch, or further technical detail.
1 of 1 entries
| Part | Vendor | Product | Version | Target SW | Target HW |
|---|---|---|---|---|---|
| App | mattermost | mattermost_server | - | - | - |