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» GHSA-xpg8-8xpv-948p
Description
Mattermost versions < 11 fail to enforce multi-factor authentication on WebSocket connections which allows unauthenticated users to access sensitive information via WebSocket events.
Basic information
Type
reviewed
Severity
medium Advisory on GitHub
Open advisory ↗ Repository advisory
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Source code
Browse source ↗ Published (advisory)
2025-11-14 09:30:27 UTC
Updated
2025-11-17 13:41:40 UTC
GitHub reviewed
2025-11-17 13:41:39 UTC
NVD published
2025-11-14
EPSS Score
Score
Percentile
0.13%
33.02%
CVSS Scores
Base score
Version
Severity
Vector
6.5
3.1
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CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
CWEs
CWE id
Name
CWE-306
Missing Authentication for Critical Function
Affected packages (2)
Vulnerable version ranges and first patched releases as published by GitHub.
Ecosystem
Package
Vulnerable range
First patched
Vulnerable functions
go
github.com/mattermost/mattermost-server < 11.1.0
11.1.0
—
go
github.com/mattermost/mattermost/server/v8 < 8.0.0-20250912063506-7d8b7b5e4a60
8.0.0-20250912063506-7d8b7b5e4a60
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cvelogic
Threat Intelligence