CVE-2021-37864

mediumpriority · track · 26OT risk · elevatedEPSS 0.006 · 48 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.58% (48th) EPSS

CVSS 4 · medium

Is it mine?

2 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · nvd

EPSS · scored 2026-10-28

Mattermost 6.1 and earlier fails to sufficiently validate permissions while viewing archived channels, which allows authenticated users to view contents of archived channels even when this is denied by system administrators by directly accessing the APIs.

cvss

Technical severity, 0–10. One row per scoring source.

6.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 2.6–6.5

v2.04mediumAV:N/AC:L/Au:S/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 8 · impact 2.9

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:Nprimary · NVD / NIST USexploitability 2.8 · impact 3.6

v3.12.6lowCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:Nsecondary · ENISA EU

v3.12.6lowCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:Nsecondary · responsibledisclosure@mattermost.comexploitability 1.2 · impact 1.4

v3.16mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-863USprimaryCWE-284US

affected products (2)

Products and version ranges known to be affected.

Mattermost Mattermostunspecified → 6.2enisa_euvdEU
mattermost mattermost≤ 6.1nvdUScpe:2.3:a:mattermost:mattermost:*:*:*:*:*:*:*:*

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd NVD CVE.org MITRE

published 2022-01-18modified 2026-06-17

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+5009 more

references (4)

External citations — patches, advisories, analysis.

scry

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