Riskcovery

CVE-2026-2455

SSRF bypass via IPv4-mapped IPv6 literals

State
Published
Severity
4.3 Medium
Published
Mar 16, 2026
Updated
Mar 16, 2026
Reserved
Feb 13, 2026

Read the record on cve.org

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

Scores

CVSSScoreVectorSource
3.14.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:NMattermost

Weaknesses

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

Affected Products

ProductVersions
MattermostMattermost
  • 11.3.0 through 11.3.0Affected
  • 11.2.0 through 11.2.2Affected
  • 10.11.0 through 10.11.10Affected
  • 11.4.0Not affected
  • 11.3.1Not affected
  • 11.2.3Not affected
  • 10.11.11Not affected

References

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