CVE-2024-42000Network attack vector

Private-channel metadata disclosure via missing membership check

Published Nov 9, 2024 · Updated Nov 12, 2024

Incorrect authorization in affected Mattermost releases allows remote authenticated users to read private-channel details through the channels API. The /api/v4/channels handler returns details for private channels without enforcing the requesting account's channel membership. Reachability requires a User or System Manager role with Read Groups permission; the reported consequence is limited to disclosure of channel details.

CVSS severity2.7
Low
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in affected Mattermost releases allows remote authenticated users to read private-channel details through the channels API. The /api/v4/channels handler returns details for private channels without enforcing the requesting account's channel membership. Reachability requires a User or System Manager role with Read Groups permission; the reported consequence is limited to disclosure of channel details.

The record

CVE
CVE-2024-42000
Published
Nov 9, 2024
Updated
Nov 12, 2024
Vendor
Mattermost
Product
Mattermost
Classifications
CWE-863, T1213
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 9, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 12, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=10.0.0
  2. Affected versionversion=9.10.0 <=9.10.2
  3. Affected versionversion=9.11.0 <=9.11.1
  4. Affected versionversion=9.5.0 <=9.5.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Mattermost · Mattermostversion=10.0.0; version=9.10.0 <=9.10.2; version=9.11.0 <=9.11.1; version=9.5.0 <=9.5.9

Published CVSS scores

4.3NISTCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
2.7Mattermost, Inc.CVSS:3.1/AV:N/AC:L/PR:H/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-863Incorrect Authorization
T1213Data from Information Repositories

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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