CVEvulnerability

CVE-2026-96259

5.5 MEDIUM Published 2026-09-22 Modified 2026-10-07 Official page ↗
Status
Analyzed
Published
2026-09-22
Last modified
2026-10-07
Assigner
[email protected]
CVSS 3.1 ([email protected])
5.5 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N
Weaknesses
CWE-918

Description

Mattermost versions 11.9.x <= 11.9.1, 11.8.x <= 11.8.5, 11.7.x <= 11.7.10, 11.10.x <= 11.10.1 fail to apply the internal-connection filter to OAuth endpoint requests, which allows a System Administrator to make the server issue requests to internal network addresses and read the responses via the configured OAuth token and userinfo endpoints.. Mattermost Advisory ID: MMSA-2026-00776

Affected configurations

• mattermost mattermost server (>= 11.7.0 < 11.7.11) • mattermost mattermost server (>= 11.8.0 < 11.8.6) • mattermost mattermost server (>= 11.9.0 < 11.9.2) • mattermost mattermost server (>= 11.10.0 < 11.10.2)

Related

Weakness · CWE (1)

  • CWE-918 Server-Side Request Forgery weakness

References