Deactivated guest accounts can authenticate via magic-link token in Mattermost REST API login endpoint
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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| Mattermost | Mattermost |
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Vendor Solution
Update Mattermost to versions 11.8.0, 11.7.3, 11.6.5 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% (0.230% probability within 30 days)
| Link | Providers |
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| https://mattermost.com/security-updates |
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| Metrics |
ssvc
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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 fail to verify whether a guest account is deactivated before creating a session in the magic-link token login path, which allows a deactivated guest user to obtain a fully functional session via a magic-link token issued prior to deactivation.. Mattermost Advisory ID: MMSA-2026-00681 | |
| Title | Deactivated guest accounts can authenticate via magic-link token in Mattermost REST API login endpoint | |
| Weaknesses | CWE-305 | |
| References |
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| Metrics |
cvssV3_1
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