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CVE-2024-6428

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

MEDIUM
6.5
CVSS Score
Published: July 3, 2024 at 08:39 AM UTC
Updated: June 17, 2026 at 08:17 AM UTC
1 product affected across 1 vendorMattermost

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Severity
MEDIUM6.5
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Mattermost· Mattermost
95%
9.5.0 ≤ v ≤ 9.5.59.5.0 ≤ v < 9.5.69.6.0 ≤ v ≤ 9.6.29.6.0 ≤ v < 9.6.39.7.0 ≤ v ≤ 9.7.49.7.0 ≤ v < 9.7.59.8.0 ≤ v < 9.8.19.5.09.6.09.7.09.8.0
Vendor states this is fixed in 9.5.6 (unaffected)
Vendor states this is fixed in 9.6.3 (unaffected)
Vendor states this is fixed in 9.7.5 (unaffected)
Vendor states this is fixed in 9.8.1 (unaffected)
Vendor states this is fixed in 9.9.0 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisory
Source: [email protected]
https://mattermost.com/security-updates

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.5MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
LOW
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-284NVD-CWE-Other

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