Mattermost Shared Channel Upload Type Validation Bypass
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mattermost | Mattermost | unaffected |
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Configuration 1 [-]
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No data.
| Vendor | Product | Versions |
|---|---|---|
| Mattermost | Mattermost | — |
Vendor Solution
Update Mattermost to versions 10.11.0, 10.8.4, 10.5.9, 9.11.18, 10.9.3, 10.10.1 or higher.
| Source | ID | Title |
|---|---|---|
EUVD |
EUVD-2025-25418 | Mattermost Fails to Validate Remote Cluster Upload Sessions |
Github GHSA |
GHSA-q453-638c-h4mr | Mattermost Fails to Validate Remote Cluster Upload Sessions |
No CVSS v4.0
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.329% probability within 30 days)
| Link | Providers |
|---|---|
| https://mattermost.com/security-updates |
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| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
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| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Mattermost
Mattermost mattermost |
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| Vendors & Products |
Mattermost
Mattermost mattermost |
| Type | Values Removed | Values Added |
|---|---|---|
| Description | Mattermost versions 10.8.x <= 10.8.3, 10.5.x <= 10.5.8, 9.11.x <= 9.11.17, 10.9.x <= 10.9.2, 10.10.x <= 10.10.0 fail to validate upload types in remote cluster upload sessions which allows a system admin to upload non-attachment file types via shared channels that could potentially be placed in arbitrary filesystem directories. | |
| Title | Mattermost Shared Channel Upload Type Validation Bypass | |
| Weaknesses | CWE-434 | |
| References |
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| Metrics |
cvssV3_1
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