CVE-2023-3584Network attack vector

Unauthorized team creation via unchecked scheme ID

Published Jul 17, 2023 · Updated Oct 21, 2024

Authorization bypass in Mattermost 7.8.0 through 7.8.4 and 7.10.0 through 7.10.2 allows remote authenticated users to create scheme-bound teams. The POST /api/v4/teams handler accepts a caller-supplied scheme_id and passes it into team creation without checking the system-console permission required to assign a team override scheme. Exploitation requires a valid account and knowledge of a Team Override Scheme ID; success creates a new team governed by that scheme but does not alter an existing team.

CVSS severity3.1
Low
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in Mattermost 7.8.0 through 7.8.4 and 7.10.0 through 7.10.2 allows remote authenticated users to create scheme-bound teams. The POST /api/v4/teams handler accepts a caller-supplied scheme_id and passes it into team creation without checking the system-console permission required to assign a team override scheme. Exploitation requires a valid account and knowledge of a Team Override Scheme ID; success creates a new team governed by that scheme but does not alter an existing team.

The record

CVE
CVE-2023-3584
Published
Jul 17, 2023
Updated
Oct 21, 2024
Vendor
Mattermost
Product
Mattermost
Classifications
CWE-863
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 17, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 21, 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 <=7.10.2
  2. Affected versionversion=0 <=7.8.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Mattermost · Mattermostversion=0 <=7.10.2; version=0 <=7.8.4

Published CVSS scores

3.1NVDCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N
3.1MattermostCVSS:3.1/AV:N/AC:H/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.

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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-863Incorrect Authorization

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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