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CVE-2023-6459

Public endpoint /metrics of Calls plugin reveals channel IDs

MEDIUM
5.3
CVSS Score
Published: December 6, 2023 at 08:11 AM UTC
Updated: June 17, 2026 at 06:50 AM UTC
2 products affected across 1 vendorMattermost ServerMattermost

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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

Description

Mattermost is grouping calls in the /metrics endpoint by id and reports that id in the response. Since this id is the channelID, the public /metrics endpoint is revealing channelIDs.

Affected

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

Mattermost Server· Mattermost
95%
v < 7.8.148.0.0 ≤ v < 8.1.5
Affected range stops below 7.8.14, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.1.5, so it looks safe — our inference, not a vendor statement
Mattermost· Mattermost
60%
v ≤ 7.8.13v ≤ 8.1.4
Vendor states this is fixed in 7.8.14 (unaffected)
Vendor states this is fixed in 8.1.5 (unaffected)

Remediation

No guide yet

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

Patch and advisory references

References (1)

Vendor Advisory
Source: [email protected]
https://mattermost.com/security-updates

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

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

CVSS

5.3MEDIUMMattermost
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-200NVD-CWE-noinfo

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