CVE-2024-42000

Unauthorized Access to view channels' details

MEDIUM

4.3

CVSS Score

Published: November 9, 2024 at 05:17 PM UTC

Updated: June 17, 2026 at 07:48 AM UTC

2 products affected across 1 vendorMattermost ServerMattermost

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Severity

MEDIUM4.3

Exploit prediction

EPSS 0.3%

SSVC

No known exploit

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.

Affected

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

Mattermost Server · Mattermost

95%

9.10.0 ≤ v < 9.10.39.11.0 ≤ v < 9.11.29.5.0 ≤ v < 9.5.1010.0.0 10.0.0 rc1 10.0.0 rc2 10.0.0 rc3 10.0.0 rc4

Affected range stops below 9.10.3, so it looks safe — our inference, not a vendor statement

Affected range stops below 9.11.2, so it looks safe — our inference, not a vendor statement

Affected range stops below 9.5.10, so it looks safe — our inference, not a vendor statement

Mattermost · Mattermost

60%

9.10.0 ≤ v ≤ 9.10.29.11.0 ≤ v ≤ 9.11.19.5.0 ≤ v ≤ 9.5.910.0.0 9.10.0 9.11.0 9.5.0

Vendor states this is fixed in 10.0.1 (unaffected)

Vendor states this is fixed in 10.1.0 (unaffected)

Vendor states this is fixed in 9.10.3 (unaffected)

Vendor states this is fixed in 9.11.2 (unaffected)

Vendor states this is fixed in 9.5.10 (unaffected)

Remediation

No guide yet

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

Patch and advisory references

https://mattermost.com/security-updates

References (1)

Vendor Advisory

Source: [email protected]

https://mattermost.com/security-updates

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

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

CVSS

4.3MEDIUM[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: LOW
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: LOW
Integrity: NONE
Availability: NONE

Vector?

Quick Info

StatusANALYZED

CWE

CWE-863

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