Public endpoint /metrics of Calls plugin reveals channel IDs

published 2023-12-06 2 y ago modified 2026-09-10 1 mo ago also BIT-mattermost-2023-6459 , EUVD-2023-3122 , GHSA-63cv-4pc2-4fcf

cvss: 5.3; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.5%; EPSS 0.5% chance of exploitation in 30 days, percentile 45%
public exploits: 0; none known

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.

Patch / fix

fixed in 4

go github.com/mattermost/mattermost-server/v6 7.8.14
go github.com/mattermost/mattermost/server/v8 8.1.5
bitnami mattermost 7.8.14, 8.1.5
Mattermost Mattermost 7.8.14, 8.1.5

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: partial
Assessed: 22 mo ago (2024-12-16)

Exploit prediction

0.53% chance of exploitation in the next 30 days, higher than 45% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
GitHub	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
NVD	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
OSV	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected packages

ecosystem	package	affected	fixed in
go	github.com/mattermost/mattermost-server/v6	<7.8.14	7.8.14
go	github.com/mattermost/mattermost/server/v8	<8.1.5	8.1.5
bitnami	mattermost	<7.8.14 >=8.0.0, <8.1.5	7.8.14 8.1.5

Affected products

Mattermost Mattermost

Classification

Weakness

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

References

mattermost.com /security-updates
web, vendor-advisory
nvd.nist.gov /vuln/detail/CVE-2023-6459
advisory, web
github.com /mattermost/mattermost
package

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary