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
Metrics
Affected Vendors & Products
References
| Link | Providers |
|---|---|
| https://mattermost.com/security-updates |
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History
Tue, 19 May 2026 17:30:00 +0000
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Mattermost mattermost Server
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| CPEs | cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Mattermost mattermost Server
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Mon, 18 May 2026 15:30:00 +0000
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| Metrics |
ssvc
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Mon, 18 May 2026 09:45:00 +0000
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Mattermost
Mattermost mattermost |
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| Vendors & Products |
Mattermost
Mattermost mattermost |
Mon, 18 May 2026 08:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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 | |
| Title | Insufficient token rotation validation in remote cluster invite confirmation | |
| Weaknesses | CWE-863 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: Mattermost
Published: 2026-05-18T06:56:11.868Z
Updated: 2026-05-18T14:34:29.961Z
Reserved: 2026-03-16T15:08:11.383Z
Link: CVE-2026-4273
Updated: 2026-05-18T14:34:24.408Z
Status : Analyzed
Published: 2026-05-18T08:16:14.180
Modified: 2026-05-19T17:23:36.817
Link: CVE-2026-4273
No data.