- Description
- Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to validate that an assigned incoming webhook user has access to the target team or channel, which allows a requester with webhook management permissions to create posts or direct messages attributed to another user via crafted incoming webhook configuration and payloads.. Mattermost Advisory ID: MMSA-2026-00683
- Source
- responsibledisclosure@mattermost.com
- NVD status
- Analyzed
- Products
- mattermost_server
CVSS 3.1
- Type
- Secondary
- Base score
- 4.9
- Impact score
- 3.6
- Exploitability score
- 1.2
- Vector string
- CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N
- Severity
- MEDIUM
- responsibledisclosure@mattermost.com
- CWE-639
- Hype score
- Not currently trending
[
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
"matchCriteriaId": "806B772A-4575-47F4-BD6B-7422C9045190",
"versionEndExcluding": "10.11.20",
"versionStartIncluding": "10.11.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
"matchCriteriaId": "2B2D3A05-5A6F-4121-80BE-6DC87A30C354",
"versionEndExcluding": "11.6.5",
"versionStartIncluding": "11.6.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
"matchCriteriaId": "61277B68-8856-4C8A-97CC-E37742682A4B",
"versionEndExcluding": "11.7.3",
"versionStartIncluding": "11.7.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
]