- Description
- Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to filter nil elements from outgoing webhook attachment payloads before processing, which allows an authenticated user to cause a denial of service (server process termination) via a crafted webhook callback response containing a null attachment entry.. Mattermost Advisory ID: MMSA-2026-00641
- Source
- responsibledisclosure@mattermost.com
- NVD status
- Analyzed
- Products
- mattermost_server
CVSS 3.1
- Type
- Secondary
- Base score
- 6.5
- Impact score
- 3.6
- Exploitability score
- 2.8
- Vector string
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Severity
- MEDIUM
- responsibledisclosure@mattermost.com
- CWE-754
- Hype score
- Not currently trending
[
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
"matchCriteriaId": "6696A83A-CD06-45BD-A4C1-16A09C4CA15B",
"versionEndExcluding": "10.11.15",
"versionStartIncluding": "10.11.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
"matchCriteriaId": "AB489375-1F54-4A24-AE2C-37D92B27FF4D",
"versionEndExcluding": "11.4.5",
"versionStartIncluding": "11.4.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
"matchCriteriaId": "617D4791-A087-42E8-BF73-B39B30CB29C8",
"versionEndExcluding": "11.5.4",
"versionStartIncluding": "11.5.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
"matchCriteriaId": "77708744-DCB4-4AE3-8146-CB043DAB6FBB",
"versionEndExcluding": "11.6.1",
"versionStartIncluding": "11.6.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
]