What is CVE-2022-0903?

CVE-2022-0903 is a medium-severity vulnerability in Mattermost, classified under Out-of-bounds Write. CVSS score: 5.3/10. Published 2022-03-10.

How severe is CVE-2022-0903?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Buffer overflow in Mattermost

CVE-2022-0903

A call stack overflow bug in the SAML login feature in Mattermost server in versions up to and including 6.3.2 allows an attacker to crash the server via submitting a maliciously crafted POST body.

Vulnerability class: Buffer Overflow

Published 2022-03-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.008 (55.8th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 55.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Mattermost — versions 6.3, 6.2, 6.1
Mattermost Server

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

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

Frequently asked questions

What is CVE-2022-0903?: CVE-2022-0903 is a medium-severity vulnerability in Mattermost, classified under Out-of-bounds Write. CVSS score: 5.3/10. Published 2022-03-10.
How severe is CVE-2022-0903?: Medium severity. CVSS v3 base score is 5.3 out of 10.