CVE-2024-4195Network attack vector

Guest-to-team-admin escalation via unchecked role transition

Published Apr 26, 2024 · Updated Aug 1, 2024

Improper access control in Mattermost 9.6.0, 9.5.x before 9.5.3, and 8.1.x before 8.1.12 allows remote authenticated users to elevate guests. UpdateTeamMemberSchemeRoles overwrites scheme-role flags without first rejecting an existing guest, allowing crafted values to replace guest status with team-admin status. Exploitation requires a remote team-admin session and changes the target guest's privileges within the same team; no system-admin access is reported.

CVSS severity2.7
Low
EPSS probability0.50%
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 9.6.0, 9.5.x before 9.5.3, and 8.1.x before 8.1.12 allows remote authenticated users to elevate guests. UpdateTeamMemberSchemeRoles overwrites scheme-role flags without first rejecting an existing guest, allowing crafted values to replace guest status with team-admin status. Exploitation requires a remote team-admin session and changes the target guest's privileges within the same team; no system-admin access is reported.

The record

CVE
CVE-2024-4195
Published
Apr 26, 2024
Updated
Aug 1, 2024
Vendor
Mattermost
Product
Mattermost
Classifications
CWE-284, T1098
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Apr 26, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 1, 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
  2. Affected versionversion=8.1.0 <=8.1.11
  3. Affected versionversion=9.5.0
  4. Affected versionversion=9.5.0 <=9.5.2
  5. Affected versionversion=9.6.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Mattermost · Mattermostversion=8.1.0; version=8.1.0 <=8.1.11; version=9.5.0; version=9.5.0 <=9.5.2; version=9.6.0

Published CVSS scores

2.7Mattermost, Inc.CVSS:3.1/AV:N/AC:L/PR:H/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control
T1098Account Manipulation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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