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CVE-2022-2408

Guest accounts can list all public channels

MEDIUM
4.3
CVSS Score
Published: July 14, 2022 at 05:25 PM UTC
Updated: June 17, 2026 at 04:41 AM UTC
1 product affected across 1 vendorMattermost

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Severity
MEDIUM4.3
Exploit prediction
EPSS 0.6%
SSVC
No known exploit

Description

The Guest account feature in Mattermost version 6.7.0 and earlier fails to properly restrict the permissions, which allows a guest user to fetch a list of all public channels in the team, in spite of not being part of those channels.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Mattermost· Mattermost
95%
v ≤ 6.3.8v < 6.3.86.4.0 ≤ v ≤ 6.5.16.5.x ≤ v ≤ 6.5.16.6.x ≤ v ≤ 6.6.16.4.x6.5.x6.6.06.6.16.6.x6.7.06.7.x 6.7.0
Affected range stops below 6.3.8, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

x_refsource_MISCVendor Advisory
Source: [email protected]
https://mattermost.com/security-updates/

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.3MEDIUMMattermost
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-200CWE-863

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