Insufficient authorization in shared channel membership sync grants team-level access instead of channel-level access
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 11.5.0, 11.2.3, 10.11.11, 11.4.1, 11.3.2 or higher.
| Source | ID | Title |
|---|---|---|
Github GHSA |
GHSA-g7fp-cqj5-x8hf | Mattermost has an Incorrect Authorization issue |
No CVSS v4.0
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.146% 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
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| Vendors & Products |
Mattermost mattermost
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| Type | Values Removed | Values Added |
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| First Time appeared |
Mattermost
Mattermost mattermost Server |
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| CPEs | cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Mattermost
Mattermost mattermost Server |
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| Metrics |
ssvc
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| Type | Values Removed | Values Added |
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| Description | Mattermost versions 11.2.x <= 11.2.2, 10.11.x <= 10.11.10, 11.4.x <= 11.4.0, 11.3.x <= 11.3.1 fail to restrict team-level access when processing membership sync from a remote cluster, which allows a malicious remote cluster to grant a user access to an entire private team instead of only the shared channel via sending crafted membership sync messages that trigger team membership assignment. Mattermost Advisory ID: MMSA-2026-00574 | |
| Title | Insufficient authorization in shared channel membership sync grants team-level access instead of channel-level access | |
| Weaknesses | CWE-863 | |
| References |
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| Metrics |
cvssV3_1
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