CVEvulnerability

CVE-2026-2455

4.3 MEDIUM Published 2026-03-16 Modified 2026-06-17 Official page ↗
Status
Analyzed
Published
2026-03-16
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
4.3 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Weaknesses
CWE-918

Description

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to canonicalize IPv4-mapped IPv6 addresses before reserved IP validation which allows an attacker to perform SSRF attacks against internal services via IPv4-mapped IPv6 literals (e.g., [::ffff:127.0.0.1]).. Mattermost Advisory ID: MMSA-2026-00585

Affected configurations

• mattermost mattermost server (>= 10.11.0 < 10.11.11) • mattermost mattermost server (>= 11.2.0 < 11.2.3) • mattermost mattermost server (>= 11.3.0 < 11.3.1)

Related

Weakness · CWE (1)

  • CWE-918 Server-Side Request Forgery weakness

References