How severe is CVE-2024-42000?

CVE-2024-42000 has a CVSS 3.x base score of 2.7, rated low severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2024-42000 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-42000?

CVE-2024-42000 primarily affects Mattermost Mattermost Server. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2024-42000?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2024-42000 have an EU (EUVD) identifier?

Yes. CVE-2024-42000 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-39386.

When was CVE-2024-42000 published?

CVE-2024-42000 was published on 2024-11-09 and last updated on 2026-06-17.

CVE-2024-42000

CVE-2024-42000 is a low-severity vulnerability in Mattermost Mattermost Server with a CVSS 3.x base score of 2.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-863.

Key facts

Severity: Low (CVSS 3.x base score 2.7)
EPSS exploit prediction: 0% (20th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-39386
Weakness: CWE-863
Affected product: Mattermost Mattermost Server
Published: 2024-11-09
Last modified: 2026-06-17

Description

Mattermost versions 9.10.x <= 9.10.2, 9.11.x <= 9.11.1, 9.5.x <= 9.5.9 and 10.0.x <= 10.0.0 fail to properly authorize the requests to /api/v4/channels which allows a User or System Manager, with "Read Groups" permission but with no access for channels to retrieve details about private channels that they were not a member of by sending a request to /api/v4/channels.

Frequently asked questions

What is CVE-2024-42000?: Mattermost versions 9.10.x <= 9.10.2, 9.11.x <= 9.11.1, 9.5.x <= 9.5.9 and 10.0.x <= 10.0.0 fail to properly authorize the requests to /api/v4/channels which allows a User or System Manager, with "Read Groups" permission but with no access for channels to retrieve details about private channels that they were not a member of by sending a request to /api/v4/channels.
How severe is CVE-2024-42000?: CVE-2024-42000 has a CVSS 3.x base score of 2.7, rated low severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2024-42000 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-42000?: CVE-2024-42000 primarily affects Mattermost Mattermost Server. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2024-42000?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2024-42000 have an EU (EUVD) identifier?: Yes. CVE-2024-42000 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-39386.
When was CVE-2024-42000 published?: CVE-2024-42000 was published on 2024-11-09 and last updated on 2026-06-17.

References

https://mattermost.com/security-updates

Affected products (6)

cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
cpe:2.3:a:mattermost:mattermost_server:10.0.0:-:*:*:*:*:*:*
cpe:2.3:a:mattermost:mattermost_server:10.0.0:rc1:*:*:*:*:*:*
cpe:2.3:a:mattermost:mattermost_server:10.0.0:rc2:*:*:*:*:*:*
cpe:2.3:a:mattermost:mattermost_server:10.0.0:rc3:*:*:*:*:*:*
cpe:2.3:a:mattermost:mattermost_server:10.0.0:rc4:*:*:*:*:*:*

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