CVE-2023-47858

Details of archived public channels are leaked to members of another team

MEDIUM

4.3

CVSS Score

Published: January 2, 2024 at 09:54 AM UTC

Updated: June 17, 2026 at 06:33 AM UTC

2 products affected across 1 vendorMattermost ServerMattermost

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Severity

MEDIUM4.3

Exploit prediction

EPSS 0.4%

SSVC

No known exploit

Description

Mattermost fails to properly verify the permissions needed for viewing archived public channels, allowing a member of one team to get details about the archived public channels of another team via the GET /api/v4/teams/<team-id>/channels/deleted endpoint.

Affected

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

Mattermost Server · Mattermost

95%

v < 8.1.79.0.0 ≤ v < 9.0.59.1.0 ≤ v < 9.1.49.2.0 ≤ v < 9.2.3

Affected range stops below 8.1.7, so it looks safe — our inference, not a vendor statement

Affected range stops below 9.0.5, so it looks safe — our inference, not a vendor statement

Affected range stops below 9.1.4, so it looks safe — our inference, not a vendor statement

Affected range stops below 9.2.3, so it looks safe — our inference, not a vendor statement

Mattermost · Mattermost

60%

v ≤ 8.1.6v ≤ 9.0.4v ≤ 9.1.3v ≤ 9.2.2

Vendor states this is fixed in 8.1.7 (unaffected)

Vendor states this is fixed in 9.0.5 (unaffected)

Vendor states this is fixed in 9.1.4 (unaffected)

Vendor states this is fixed in 9.2.3 (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

4.3MEDIUMMattermost

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

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-284NVD-CWE-Other

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