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CVE-2026-4273

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CVE-2026-4273

Published: May 18, 2026

Modified: May 18, 2026

PUBLISHED

CVSS v3.1

3.7

LOW

Description

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13 fail to validate that the RefreshedToken differs from the original invite token during remote cluster invite confirmation which allows an authenticated attacker to bypass token rotation and reuse the original invite token via sending a crafted invite confirmation with a RefreshedToken matching the original token. Mattermost Advisory ID: MMSA-2026-00575

VendorProductVersions

Mattermost

Mattermost

affected
11.5.0 - <= 11.5.1
affected
10.11.0 - <= 10.11.13
unaffected
11.6.0
unaffected
11.5.2
unaffected
10.11.14

Weaknesses (CWE)

CWE-863

CVSS v3.1 Details

CVSS v3.1 Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

References

MMSA-2026-00575
vendor-advisory

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