What is CVE-2026-93848?

CVE-2026-93848 is a low-severity vulnerability in Mattermost, classified under Server-Side Request Forgery (SSRF). CVSS score: 2.7/10. Published 2026-10-26.

How severe is CVE-2026-93848?

Low severity. CVSS v3 base score is 2.7 out of 10.

SSRF in Mattermost

CVE-2026-93848

Mattermost versions 11.7.x <= 11.7.10 fail to apply outbound internal-connection filtering to the OpenID discovery endpoint request which allows a System Administrator to determine whether internal addresses and ports are reachable from the server via an unauthenticated login request that triggers the discovery fetch.. Mattermost Advisory ID: MMSA-2026-00774

Vulnerability class: SSRF (Server-Side Request Forgery)

Published 2026-10-26 · last modified 2026-10-26.

CVSS v3 metric

CVSS v3 base score 2.7 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Mattermost

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

mattermost.com/security-updates (vendor-advisory)

Frequently asked questions

What is CVE-2026-93848?: CVE-2026-93848 is a low-severity vulnerability in Mattermost, classified under Server-Side Request Forgery (SSRF). CVSS score: 2.7/10. Published 2026-10-26.
How severe is CVE-2026-93848?: Low severity. CVSS v3 base score is 2.7 out of 10.