CVE-2026-93848

Mattermost OpenID discovery endpoint request bypasses outbound connection filtering, allowing SSRF by a System Administrator

State: Published
Severity: 2.7 Low
Published: Oct 26, 2026
Updated: Oct 26, 2026
Reserved: Sep 18, 2026

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Description

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

Scores

CVSS	Score	Vector	Source
3.1	2.7 Low	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N	Mattermost

Weaknesses

CWE-918 Server-Side Request Forgery (SSRF)

Affected Products

Product	Versions
MattermostMattermost	11.7.0 through 11.7.10Affected 11.11.0Not affected 11.7.11Not affected

References

MMSA-2026-00774vendor-advisory

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