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CVE-2023-6202

Insecure Direct Object Reference in /plugins/focalboard/ api/v2/users of Mattermost Boards

MEDIUM
4.3
CVSS Score
Published: November 27, 2023 at 09:12 AM UTC
Updated: June 17, 2026 at 06:50 AM UTC
1 product affected across 1 vendorMattermost

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Severity
MEDIUM4.3
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

Mattermost fails to perform proper authorization in the /plugins/focalboard/api/v2/users endpoint allowing an attacker who is a guest user and knows the ID of another user to get their information (e.g. name, surname, nickname) via Mattermost Boards.

Affected

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

Mattermost· Mattermost
95%
v ≤ 7.8.12v ≤ 8.1.3v ≤ 9.0.1v ≤ 9.1.08.0.0 ≤ v ≤ 8.1.3
Vendor states this is fixed in 7.8.13 (unaffected)
Vendor states this is fixed in 8.1.4 (unaffected)
Vendor states this is fixed in 9.0.2 (unaffected)
Vendor states this is fixed in 9.1.1 (unaffected)

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)

Vendor 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-284NVD-CWE-noinfo

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