Plugin bot username conflict allows user account to be used as bot identity in Mattermost Server
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 11.7.0, 11.6.2, 11.5.5, 10.11.16, 10.11.17 or higher.
| Source | ID | Title |
|---|---|---|
Github GHSA |
GHSA-3vmp-whvv-5v9v | Mattermost doesn't validate that a username returned during bot registration belongs to a bot account |
No CVSS v4.0
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.190% probability within 30 days)
| Link | Providers |
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| https://mattermost.com/security-updates |
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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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| Metrics |
ssvc
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| Type | Values Removed | Values Added |
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| Description | Mattermost versions 11.6.x <= 11.6.1, 11.5.x <= 11.5.4, 10.11.x <= 10.11.15, 10.11.x <= 10.11.16 fail to validate that a username returned during bot registration belongs to a bot account, which allows an unprivileged attacker to intercept private messages sent by plugins via direct message channels by pre-registering a user account with a predictable plugin bot username.. Mattermost Advisory ID: MMSA-2026-00649 | |
| Title | Plugin bot username conflict allows user account to be used as bot identity in Mattermost Server | |
| Weaknesses | CWE-200 | |
| References |
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| Metrics |
cvssV3_1
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