CVE-2021-37863: mattermost Improper Input Validation
CVSS: 5.7v3.1MediumModified
Published 17-12-2021Last modified 04-08-2024
Vulnerability summary
CVE-2021-37863 is a medium (CVSS 5.7) Improper Input Validation vulnerability in mattermost. EPSS estimates a 0.86% chance of exploitation in the next 30 days, higher than 57.8% of scored vulnerabilities.
CVSS score
5.7/10
010
Medium · v3.1 (NVD)EPSS score
0.86%
0%100%
Low · +0.03 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 17-12-2021PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
Mattermost 6.0 and earlier fails to sufficiently validate parameters during post creation, which allows authenticated attackers to cause a client-side crash of the web application via a maliciously crafted post.
CVSS metrics
3 scores · 2 sources · 2 versionsMedium 5.7Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:HSources2 sources · 3.5–5.7
- CVE.orgCNA3.5LowCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:LDiffers
Low 3.5Preferred score · NVD (NIST)
AV:N/AC:M/Au:S/C:N/I:N/A:PSourcesSingle source
EPSS trend
Probability
0.86%
Chance of exploitation in the next 30 days
Percentile
58%
Versus all other CVEs
30-day change
+0.03 pp
From 0.83% on 19-09-2026
19-09-202619-10-2026
EPSS score0.86%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Mattermost2 products
- mattermost≥ unspecified, ≤ 6.0
- mattermost_server≤ 6.0
1 vendor · 2 products