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CVE-2023-6459

Public endpoint /metrics of Calls plugin reveals channel IDs

Medium5.3EPSS 0.53%
Published
Updated
Reserved
Assigned by
Mattermost

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.

Timeline

  1. ID reserved

    By Mattermost

  2. · 5 days later

    Published

  3. · 13 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2023-6459, by who scored it
Scored byCVSSScoreVector
MattermostCNA (assigner)3.1Medium5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
NVDNVD · Modified3.1Medium5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
EPSS (exploitation in 30 days)
0.53% · top 55% of all CVEs (7 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: yes · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.3.

Weakness

Affected products

Affected packages

From reviewed advisories of the GitHub Advisory Database.

What to do

Solution: Update Mattermost Server to versions 8.1.5, 7.8.14 or higher.

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .