CVE-2024-12247Network attack vector

Continued unauthorized access via stale cluster permissions

Published Dec 5, 2024 · Updated Dec 5, 2024

Authorization failure in Mattermost 9.7.0 through 9.7.5, 9.8.0 through 9.8.2, and 9.9.0 through 9.9.2 allows attackers to retain revoked permissions. The cluster permission-scheme update path fails to propagate a changed scheme to every node, leaving prior authorization data in effect. Exploitation requires an authenticated account, an HA deployment, and a scheme change; a stale node continues to authorize actions removed from that account.

CVSS severity4.6
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization failure in Mattermost 9.7.0 through 9.7.5, 9.8.0 through 9.8.2, and 9.9.0 through 9.9.2 allows attackers to retain revoked permissions. The cluster permission-scheme update path fails to propagate a changed scheme to every node, leaving prior authorization data in effect. Exploitation requires an authenticated account, an HA deployment, and a scheme change; a stale node continues to authorize actions removed from that account.

The record

CVE
CVE-2024-12247
Published
Dec 5, 2024
Updated
Dec 5, 2024
Vendor
Mattermost
Product
Mattermost
Classifications
CWE-863
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 5, 2024CVE publishedPublication date reported by the CVE source.
  2. Dec 5, 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=9.7.0 <=9.7.5
  2. Affected versionversion=9.8.0 <=9.8.2
  3. Affected versionversion=9.9.0 <=9.9.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Mattermost · Mattermostversion=9.7.0 <=9.7.5; version=9.8.0 <=9.8.2; version=9.9.0 <=9.9.2

Published CVSS scores

4.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
4.6MattermostCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L

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-863Incorrect Authorization

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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