What is CVE-2021-37861?

CVE-2021-37861 is a medium-severity vulnerability in Mattermost, classified under Insertion of Sensitive Information into Log File. CVSS score: 5.8/10. Published 2021-12-09.

How severe is CVE-2021-37861?

Medium severity. CVSS v3 base score is 5.8 out of 10.

Information disclosure in Mattermost

CVE-2021-37861

Mattermost 6.0.2 and earlier fails to sufficiently sanitize user's password in audit logs when user creation fails.

Published 2021-12-09 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.009 (57.5th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 57.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Mattermost — versions unspecified

Weakness classification (CWE)

CWE-532 — Insertion of Sensitive Information into Log File

References

mattermost.com/security-updates/ (Vendor Advisory)

Frequently asked questions

What is CVE-2021-37861?: CVE-2021-37861 is a medium-severity vulnerability in Mattermost, classified under Insertion of Sensitive Information into Log File. CVSS score: 5.8/10. Published 2021-12-09.
How severe is CVE-2021-37861?: Medium severity. CVSS v3 base score is 5.8 out of 10.