Medium
Insufficient Input Validation on Post Props
Type: advisorySources: OSV
Mattermost versions 10.2.x <= 10.2.0, 9.11.x <= 9.11.5, 10.0.x <= 10.0.3, 10.1.x <= 10.1.3 fail to properly validate post props which allows a malicious authenticated user to cause a crash via a malicious post.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2025-20086
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 5 Nov 2026, 06:07 UTC · Revision 1
Source evidence
Insufficient Input Validation on Post Props
core-osv · Original sourcePublished 15 Jan 2025, 16:49 UTC
Mattermost versions 10.2.x <= 10.2.0, 9.11.x <= 9.11.5, 10.0.x <= 10.0.3, 10.1.x <= 10.1.3 fail to properly validate post props which allows a malicious authenticated user to cause a crash via a malicious post.
osv:CVE-2025-20086
Complete source record
{
"id": "99a8fe526b088912d87e38e82e436675015453e6d9be77b8d52990994bc2fe3f",
"url": "https://osv.dev/vulnerability/CVE-2025-20086",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Insufficient Input Validation on Post Props",
"summary": "Mattermost versions 10.2.x <= 10.2.0, 9.11.x <= 9.11.5, 10.0.x <= 10.0.3, 10.1.x <= 10.1.3 fail to properly validate post props which allows a malicious authenticated user to cause a crash via a malicious post.",
"evidence": "osv:CVE-2025-20086",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2025-20086",
"aliases": [
"CVE-2025-20086",
"GHSA-5m7j-6gc4-ff5g",
"GO-2025-3392"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/mattermost/mattermost",
"type": "GIT",
"events": [
{
"introduced": "0bc2ddd42375a75ab14e63f038165150d4f07659"
},
{
"fixed": "51ac054df0cf662ef3fa4657df4e058a33687135"
},
{
"introduced": "2d83d21388f3111bffe4b1f63521b21d77ec2cef"
},
{
"fixed": "ff3c76437efdef1fdf44f92434ac588e4d4e964c"
},
{
"introduced": "50f91e2453188bbd0153db0e98714022db022a5c"
},
{
"fixed": "90937a3832837b2d193c25aada123ee88942ebed"
},
{
"introduced": "9a578312304f06bb423d668fa8f1b975dc1fe79a"
},
{
"last_affected": "9a578312304f06bb423d668fa8f1b975dc1fe79a"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "9.11.0"
},
{
"fixed": "9.11.6"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "10.0.0"
},
{
"fixed": "10.0.4"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "10.1.0"
},
{
"fixed": "10.1.4"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:mattermost:mattermost_server:10.2.0:-:*:*:*:*:*:*",
"range": [
{
"introduced": "10.2.0-NA"
},
{
"last_affected": "10.2.0-NA"
}
],
"source": "CPE_STRING"
}
]
}
}
],
"versions": [
"10.2.0-NA",
"v9.11.6-rc2",
"v10.0.4-rc2",
"v10.1.4-rc1",
"v10.0.4-rc1",
"v9.11.6-rc1",
"v10.1.3",
"v10.0.3-rc1",
"v10.0.3",
"v9.11.5",
"v9.11.5-rc1",
"v10.1.3-rc1",
"v10.2.0-rc3",
"v10.2.0",
"v9.11.4",
"v10.0.2-rc2",
"v10.0.2",
"v10.0.2-rc1",
"v9.11.4-rc1",
"v10.1.2",
"v10.1.2-rc1",
"v10.0.1",
"v9.11.3",
"v9.11.3-rc2",
"v10.1.1-rc1",
"v10.1.1",
"v9.11.3-rc1",
"v10.0.1-rc1",
"v10.1.0-rc3",
"v10.1.0",
"@mattermost/types@10.1.0",
"@mattermost/client@10.1.0",
"v9.11.2",
"v9.11.2-rc2",
"v9.11.2-rc1",
"v10.0.0-rc4",
"v10.0.0",
"@mattermost/types@10.0.0",
"@mattermost/client@10.0.0",
"v9.11.1-rc1",
"v9.11.1",
"v9.11.0-rc3",
"v9.11.0",
"@mattermost/types@9.11.0",
"@mattermost/client@9.11.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-20086.json"
}
}
],
"modified": "2026-10-28T02:30:42.901717986Z",
"provider": "osv",
"references": [
"https://mattermost.com/security-updates",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/20xxx/CVE-2025-20086.json",
"https://nvd.nist.gov/vuln/detail/CVE-2025-20086"
],
"provider_metadata": {
"cwe_ids": [
"CWE-1287"
],
"cna_assigner": "Mattermost",
"unresolved_ranges": [
{
"extracted_events": [
{
"range": [
{
"introduced": "10.2.0"
},
{
"last_affected": "10.2.0"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandaloneSingleVersion"
}
]
},
{
"extracted_events": [
{
"range": [
{
"introduced": "9.11.0"
},
{
"last_affected": "9.11.5"
},
{
"introduced": "10.0.0"
},
{
"last_affected": "10.0.3"
},
{
"introduced": "10.1.0"
},
{
"last_affected": "10.1.3"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
}
]
}
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/20xxx/CVE-2025-20086.json"
}
},
"related_cves": [
{
"value": "CVE-2025-20086",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 510964,
"published_at": "2025-01-15T16:49:51.066+00:00"
}