CVE-2024-1942Network attack vector

Post disclosure via missing channel-membership check

Published Feb 29, 2024 · Updated Aug 12, 2024

Improper access control in Mattermost 8.1.0 through 8.1.8, 9.2.0 through 9.2.4, and 9.3.0 allows remote authenticated users to read restricted posts. GetPostInfo treated every open channel as accessible and relied on broad channel permissions for other channel types instead of requiring the requesting user to be a channel member when resolving permalink metadata. A valid account and a crafted post containing a permalink are required, and exposure is limited to individual post contents in channels outside that account's membership.

CVSS severity4.3
Medium
EPSS probability0.36%
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 Mattermost 8.1.0 through 8.1.8, 9.2.0 through 9.2.4, and 9.3.0 allows remote authenticated users to read restricted posts. GetPostInfo treated every open channel as accessible and relied on broad channel permissions for other channel types instead of requiring the requesting user to be a channel member when resolving permalink metadata. A valid account and a crafted post containing a permalink are required, and exposure is limited to individual post contents in channels outside that account's membership.

The record

CVE
CVE-2024-1942
Published
Feb 29, 2024
Updated
Aug 12, 2024
Vendor
Mattermost
Product
Mattermost
Classifications
CWE-284, T1213.005
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 29, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 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=8.1.0 <=8.1.8
  2. Affected versionversion=9.2.0 <=9.2.4
  3. Affected versionversion=9.3.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Mattermost · Mattermostversion=8.1.0 <=8.1.8; version=9.2.0 <=9.2.4; version=9.3.0

Published CVSS scores

5.3GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
4.3Mattermost, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
4.3NIST NVDCVSS: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
T1213.005Messaging Applications

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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