CVE-2021-37864: mattermost Improper Access Control
CVSS: 6.5v3.1MediumModified
Published 18-01-2022Last modified 06-12-2024
Vulnerability summary
CVE-2021-37864 is a medium (CVSS 6.5) Improper Access Control vulnerability in mattermost. EPSS estimates a 0.58% chance of exploitation in the next 30 days, higher than 46.9% of scored vulnerabilities.
CVSS score
6.5/10
010
Medium · v3.1 (NVD)EPSS score
0.58%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 18-01-2022PublishedVulnerability first disclosed.
- 06-12-2024Last modifiedVulnerability information updated.
Description
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 metrics
3 scores · 2 sources · 2 versionsMedium 6.5Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:NSources2 sources · 2.6–6.5
- CVE.orgCNA2.6LowCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:NDiffers
Medium 4.0Preferred score · NVD (NIST)
AV:N/AC:L/Au:S/C:P/I:N/A:NSourcesSingle source
EPSS trend
Probability
0.58%
Chance of exploitation in the next 30 days
Percentile
47%
Versus all other CVEs
30-day change
0.00 pp
From 0.58% on 20-09-2026
20-09-202620-10-2026
EPSS score0.58%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-284Improper Access ControlThe product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.
- CWE-863Incorrect AuthorizationThe product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.
Affected systems
Mattermost1 product
- mattermost≥ unspecified, < 6.2 | ≤ 6.1
1 vendor · 1 product