CVE-2023-6202Network attack vector

Guest profile disclosure via missing authorization

Published Nov 27, 2023 · Updated Oct 11, 2024

Improper access control in affected Mattermost releases allows remote authenticated users to read another user's profile data. The /plugins/focalboard/api/v2/users endpoint returns a requested user's record without verifying that a guest may access that user. A guest account and knowledge of another user's ID are required; exposure is limited to profile fields such as names and nicknames.

CVSS severity4.3
Medium
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in affected Mattermost releases allows remote authenticated users to read another user's profile data. The /plugins/focalboard/api/v2/users endpoint returns a requested user's record without verifying that a guest may access that user. A guest account and knowledge of another user's ID are required; exposure is limited to profile fields such as names and nicknames.

The record

CVE
CVE-2023-6202
Published
Nov 27, 2023
Updated
Oct 11, 2024
Vendor
Mattermost
Product
Mattermost
Classifications
CWE-284, T1087
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 27, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 11, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=7.8.12
  2. Affected versionversion=0 <=8.1.3
  3. Affected versionversion=0 <=9.0.1
  4. Affected versionversion=0 <=9.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Mattermost · Mattermostversion=0 <=7.8.12; version=0 <=8.1.3; version=0 <=9.0.1; version=0 <=9.1.0

Published CVSS scores

4.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
4.3Mattermost, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control
T1087Account Discovery

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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