What is CVE-2023-4108?

CVE-2023-4108 is a medium-severity vulnerability in Mattermost, classified under Insertion of Sensitive Information into Log File. CVSS score: 4.5/10. Published 2023-08-11.

How severe is CVE-2023-4108?

Medium severity. CVSS v3 base score is 4.5 out of 10.

Information disclosure in Mattermost

CVE-2023-4108

Mattermost fails to sanitize post metadata during audit logging resulting in permalinks contents being logged

Published 2023-08-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.006 (46.8th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 46.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Mattermost — versions 0, 7.8.8, 7.9.6

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-2023-4108?: CVE-2023-4108 is a medium-severity vulnerability in Mattermost, classified under Insertion of Sensitive Information into Log File. CVSS score: 4.5/10. Published 2023-08-11.
How severe is CVE-2023-4108?: Medium severity. CVSS v3 base score is 4.5 out of 10.