CVE-2021-37863 json
Mattermost 6.0 and earlier fails to sufficiently validate parameters during post creation, which allows authenticated attackers to cause a…
published 2021-12-17 4 y ago modified 2026-06-17 4 mo ago also BIT-mattermost-2021-37863 , EUVD-2021-24341
- cvss
- 3.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.9%
- EPSS 0.9% chance of exploitation in 30 days, percentile 58%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- bitnami mattermost 6.0.1
Exploit prediction
0.86% chance of exploitation in the next 30 days, higher than 58% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 3.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L |
| NVD | 3.1 | 5.7 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H |
| NVD | 2.0 | 3.5 | AV:N/AC:M/Au:S/C:N/I:N/A:P |
| OSV | 3.1 | 5.7 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| bitnami | mattermost | <6.0.1 |
6.0.1 |
Affected products
- Mattermost Mattermost
Classification
- Weakness
-
- CWE-20 Improper Input Validation
References
-
mattermost.com
/security-updates/
vendor-advisory, web
-
hackerone.com
/reports/1253732
permissions-required, web
-
nvd.nist.gov
/vuln/detail/CVE-2021-37863
web
Sources
- CVE List CVE-2021-37863
- NVD CVE-2021-37863
- OSV BIT-mattermost-2021-37863
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