CVE-2026-22545

Description

Mattermost versions 10.11.x <= 10.11.10 fail to validate user's authentication method when processing account auth type switch which allows an authenticated attacker to change account password without confirmation via falsely claiming a different auth provider.. Mattermost Advisory ID: MMSA-2026-00583

CVSS Metrics

• v3.1•LOW•Score: 3.1CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N
• v3.1•LOW•Score: 3.5CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N

EPSS Trends

Current EPSS score: 0.07%• Percentile: 21%

Techniques & Countermeasures

• CWE-863•Incorrect Authorization

  The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.

Affected Systems

• github.com/mattermost•mattermost-server

  ≥ 11.3.0-rc1+incompatible, < 11.3.1+incompatible | < 5.3.2-0.20260127144908-ced9a56e3988 | ≥ 10.11.0-rc1, < 10.11.11 | ≥ 11.2.0-rc1, < 11.2.3 | ≥ 11.3.0-rc1, < 11.3.1

• github.com/mattermost/mattermost-server•v5

  all

• github.com/mattermost/mattermost-server•v6

  all

• github.com/mattermost/mattermost/server•v8

  < 8.0.0-20260127144908-ced9a56e3988

• mattermost•mattermost

  ≥ 10.11.0, ≤ 10.11.10

• mattermost•mattermost_server

  ≥ 10.11.0, < 10.11.11

References (5)

• https://mattermost.com/security-updates
• https://nvd.nist.gov/vuln/detail/CVE-2026-22545
• https://github.com/mattermost/mattermost/commit/ced9a56e3988fe9fd4559d45f9971dbd562e2218
• https://github.com/mattermost/mattermost
• https://github.com/advisories/GHSA-rv67-7w2g-7976