Deactivated user accounts can continue to obtain valid OAuth access tokens via refresh token grant in Mattermost
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
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| Mattermost | Mattermost | unaffected |
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Configuration 1 [-]
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No data.
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| Mattermost | Mattermost |
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Vendor Solution
Update Mattermost to versions 11.8.0, 11.7.3, 11.6.5, 10.11.20 or higher.
No CVSS v4.0
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.303% probability within 30 days)
| Link | Providers |
|---|---|
| https://mattermost.com/security-updates |
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| Type | Values Removed | Values Added |
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| Metrics |
ssvc
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| Type | Values Removed | Values Added |
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| First Time appeared |
Mattermost
Mattermost mattermost |
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| Vendors & Products |
Mattermost
Mattermost mattermost |
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| Description | Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to invalidate OAuth refresh tokens upon user account deactivation, which allows a deactivated user or an attacker in possession of a valid refresh token to obtain new functional access tokens via the OAuth refresh token grant endpoint.. Mattermost Advisory ID: MMSA-2026-00680 | |
| Title | Deactivated user accounts can continue to obtain valid OAuth access tokens via refresh token grant in Mattermost | |
| Weaknesses | CWE-305 | |
| References |
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| Metrics |
cvssV3_1
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