CVE-2024-1887Network attack vector

Unaudited post retrieval via omitted compliance check

Published Feb 29, 2024 · Updated Aug 7, 2024

Access control failure in Mattermost 8.1.8 and earlier, 9.2.0 through 9.2.4, and 9.3.0 allows remote authenticated users to read public-channel posts. The post-fetching path omits the compliance-export state check before bypassing channel-membership enforcement for public channels. Any logged-in user can retrieve posts without joining the channel, and the access is omitted from compliance export records.

CVSS severity4.3
Medium
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Access control failure in Mattermost 8.1.8 and earlier, 9.2.0 through 9.2.4, and 9.3.0 allows remote authenticated users to read public-channel posts. The post-fetching path omits the compliance-export state check before bypassing channel-membership enforcement for public channels. Any logged-in user can retrieve posts without joining the channel, and the access is omitted from compliance export records.

The record

CVE
CVE-2024-1887
Published
Feb 29, 2024
Updated
Aug 7, 2024
Vendor
Mattermost
Product
Mattermost
Classifications
CWE-284, T1213
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 29, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 7, 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=0 <=8.1.8
  2. Affected versionversion=0 <=9.2.4
  3. Affected versionversion=0 <=9.3.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Mattermost · Mattermostversion=0 <=8.1.8; version=0 <=9.2.4; version=0 <=9.3.0

Published CVSS scores

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