Medium
DoS in Calls plugin via malformed UTF-8 in WebSocket request
Type: advisorySources: OSV
Mattermost versions 11.0.x <= 11.0.4, 10.12.x <= 10.12.2, 10.11.x <= 10.11.6 fail to check WebSocket request field for proper UTF-8 format, which allows attacker to crash Calls plug-in via sending malformed request.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2025-12689
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 01:23 UTC · Revision 1
Source evidence
DoS in Calls plugin via malformed UTF-8 in WebSocket request
core-osv · Original sourcePublished 17 Dec 2025, 18:14 UTC
Mattermost versions 11.0.x <= 11.0.4, 10.12.x <= 10.12.2, 10.11.x <= 10.11.6 fail to check WebSocket request field for proper UTF-8 format, which allows attacker to crash Calls plug-in via sending malformed request.
osv:CVE-2025-12689
Complete source record
{
"id": "311a1796712e18ce18422de6461412bb0c7b3d8d44617bad4dedb8a4292898fe",
"url": "https://osv.dev/vulnerability/CVE-2025-12689",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DoS in Calls plugin via malformed UTF-8 in WebSocket request",
"summary": "Mattermost versions 11.0.x <= 11.0.4, 10.12.x <= 10.12.2, 10.11.x <= 10.11.6 fail to check WebSocket request field for proper UTF-8 format, which allows attacker to crash Calls plug-in via sending malformed request.",
"evidence": "osv:CVE-2025-12689",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2025-12689",
"aliases": [
"CVE-2025-12689",
"GHSA-j5vq-62gr-8v3r",
"GO-2025-4255"
],
"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": "5b955468ea1ea8b56c0fb10feb258a36a767d7bb"
},
{
"fixed": "9d74b930db166e933d66d1873fb87afa6bc3e600"
},
{
"introduced": "ba3dc1612ce8f37bf9814b1ea6364181fb5abd62"
},
{
"fixed": "09ae989823a456a6831eca1eb4f49c71589dafab"
},
{
"introduced": "0"
},
{
"fixed": "33fcf2d87f96ed29b1196d3ebb22202ed86712c9"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "10.11.0"
},
{
"fixed": "10.11.7"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "10.12.0"
},
{
"fixed": "10.12.3"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "11.0.0"
},
{
"fixed": "11.0.5"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"v10.11.6",
"mattermost-redux@11.0.4",
"@mattermost/types@11.0.4",
"@mattermost/client@11.0.4",
"v10.11.5",
"v10.12.2",
"v11.0.4",
"v11.0.3",
"v11.0.3-rc1",
"v10.12.1",
"v10.11.4-rc3",
"v10.11.4",
"v11.0.2",
"v10.11.4-rc2",
"v11.0.1-rc3",
"v11.0.1",
"v10.11.4-rc1",
"v10.12.1-rc1",
"v11.0.1-rc2",
"v11.0.1-rc1",
"v11.0.0-alpha.1",
"v10.11.3",
"server/public/v0.1.19",
"server/public/v0.1.18",
"v10.12.0",
"mattermost-redux@10.12.0",
"@mattermost/types@10.12.0",
"@mattermost/client@10.12.0",
"server/public/v0.1.17",
"v10.11.2-rc2",
"v10.11.2",
"v10.11.2-rc1",
"v10.11.1",
"v10.11.1-rc1",
"v10.11.0-rc3",
"v10.11.0",
"mattermost-redux@10.11.0",
"@mattermost/types@10.11.0",
"@mattermost/client@10.11.0",
"server/public/v0.1.16",
"preview-v0.1",
"server/public/v0.1.15",
"server/public/v0.1.14",
"server/public/v0.1.13",
"server/public/v0.1.12",
"server/public/v0.1.11",
"server/public/v0.1.10",
"server/public/v0.1.9",
"server/public/v0.1.8",
"server/public/v0.1.7",
"server/public/v0.1.6",
"server/public/v0.1.5",
"server/public/v0.1.4",
"server/public/v0.1.3",
"server/public/v0.1.2",
"server/public/v0.1.1",
"server/public/v0.1.0",
"server/public/v0.0.18",
"server/public/v0.0.17",
"server/public/v0.0.16",
"server/public/v0.0.15",
"server/public/v0.0.14",
"server/public/v0.0.13",
"server/public/v0.0.12",
"server/public/v0.0.11",
"server/public/v0.0.10",
"server/public/v0.0.9",
"server/public/v0.0.8",
"server/public/v0.0.7",
"server/public/v0.0.6",
"server/public/v0.0.5",
"cloud-2022-11-24-1",
"cloud-2022-11-11-1",
"cloud-2022-10-06-1",
"cloud-2022-09-08-1",
"cloud-2022-08-10-1",
"cloud-2022-07-20-1",
"v5.2.0-rc2",
"v5.2.0-rc1",
"v5.1.0-rc1",
"v5.0.0-rc1",
"v4.10.0-rc1",
"v4.9.0-rc1",
"v4.8.0-rc1",
"v4.7.0-rc1",
"v4.6.0-rc2",
"v4.6.0-rc1",
"v4.5.0-rc1",
"v4.4.0-rc1",
"v4.3.0-rc1",
"v4.2.0-rc1",
"v0.5.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-12689.json"
}
}
],
"modified": "2026-10-28T02:30:24.753744773Z",
"provider": "osv",
"references": [
"https://mattermost.com/security-updates",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/12xxx/CVE-2025-12689.json",
"https://nvd.nist.gov/vuln/detail/CVE-2025-12689"
],
"provider_metadata": {
"cwe_ids": [
"CWE-1287"
],
"cna_assigner": "Mattermost",
"unresolved_ranges": [
{
"extracted_events": [
{
"range": [
{
"introduced": "11.0.0"
},
{
"last_affected": "11.0.4"
},
{
"introduced": "10.12.0"
},
{
"last_affected": "10.12.2"
},
{
"introduced": "10.11.0"
},
{
"last_affected": "10.11.6"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
}
]
}
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/12xxx/CVE-2025-12689.json"
}
},
"related_cves": [
{
"value": "CVE-2025-12689",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 491559,
"published_at": "2025-12-17T18:14:10.973+00:00"
}