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CVE-2024-6428

Limited DoS due to permitting creating users with user-defined IDs

Medium5.3EPSS 0.39%
Published
Updated
Reserved
Assigned by
Mattermost

Description

Mattermost versions 9.8.0, 9.7.x <= 9.7.4, 9.6.x <= 9.6.2, 9.5.x <= 9.5.5 fail to prevent specifying a RemoteId when creating a new user which allows an attacker to specify both a remoteId and the user ID, resulting in creating a user with a user-defined user ID. This can cause some broken functionality in User Management such administrative actions against the user not working.

Scores

CVSS scores of CVE-2024-6428, by who scored it
Scored byCVSSScoreVector
MattermostCNA (assigner)3.1Medium5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
NVDNVD · Modified3.1Medium6.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
EPSS (exploitation in 30 days)
0.39% · top 66% of all CVEs (6 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: yes · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.3.

Weakness

Affected products

  • Mattermost · Mattermost

    • affected 9.8.0
    • affected 9.7.0 – ≤ 9.7.4
    • affected 9.6.0 – ≤ 9.6.2
    • affected 9.5.0 – ≤ 9.5.5
    • unaffected 9.9.0
    • unaffected 9.8.1
    • unaffected 9.7.5
    • unaffected 9.6.3
    • unaffected 9.5.6

What to do

Solution: Update Mattermost to versions 9.9.0, 9.8.1, 9.7.5, 9.6.3, 9.5.6 or higher.

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

Badge for a README or a ticket

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Record last updated .