High
Security advisory
An issue was discovered in Mattermost Server before 5.8.0, 5.7.2, 5.6.5, and 4.10.7. It allows attackers to cause a denial of service (memory consumption) via OpenGraph.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2019-20880
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 04:14 UTC · Revision 1
Source evidence
An issue was discovered in Mattermost Server before 5.8.0, 5.7.2, 5.6.5, and 4.10.7. It allows attackers to cause a denial of service (memory consumption) via OpenGraph.
osv:CVE-2019-20880
Complete source record
{
"id": "a376587cc9da4504a2c701c4a3ac43d4906d51b94bbb71d302bb165409149d7c",
"url": "https://osv.dev/vulnerability/CVE-2019-20880",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2019-20880",
"summary": "An issue was discovered in Mattermost Server before 5.8.0, 5.7.2, 5.6.5, and 4.10.7. It allows attackers to cause a denial of service (memory consumption) via OpenGraph.",
"evidence": "osv:CVE-2019-20880",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2019-20880",
"aliases": [
"CVE-2019-20880"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/mattermost/mattermost",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "849fafe8f4c3a25b3cd712a580a74aa75a4829e2"
},
{
"introduced": "0c1207215852a8726c3f09dea157d597fec368df"
},
{
"fixed": "7f10b8349810f571de096e2430bcb56ab3527ae1"
},
{
"introduced": "7e5fda43bda67cd061e527b64046f241c2d6cc32"
},
{
"fixed": "2b6f2b07544c63da58a920f3e7791b9f510ff0c2"
},
{
"introduced": "a410b7d6b5a852b99f8bf78ea3cb1392bc49de56"
},
{
"last_affected": "24f11a12758fe75ce06269be7f9fb7bb790aec43"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "4.10.7"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "5.6.0"
},
{
"fixed": "5.6.5"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "5.7.0"
},
{
"fixed": "5.7.2"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:mattermost:mattermost_server:5.8.0:rc1:*:*:*:*:*:*",
"range": [
{
"introduced": "5.8.0-rc1"
},
{
"last_affected": "5.8.0-rc1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:mattermost:mattermost_server:5.8.0:rc2:*:*:*:*:*:*",
"range": [
{
"introduced": "5.8.0-rc2"
},
{
"last_affected": "5.8.0-rc2"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:mattermost:mattermost_server:5.8.0:rc3:*:*:*:*:*:*",
"range": [
{
"introduced": "5.8.0-rc3"
},
{
"last_affected": "5.8.0-rc3"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:mattermost:mattermost_server:5.8.0:rc4:*:*:*:*:*:*",
"range": [
{
"introduced": "5.8.0-rc4"
},
{
"last_affected": "5.8.0-rc4"
}
],
"source": "CPE_STRING"
}
]
}
}
],
"versions": [
"5.8.0-rc1",
"5.8.0-rc2",
"5.8.0-rc3",
"5.8.0-rc4",
"v5.8.0-rc4",
"v5.8.0",
"v5.8.0-rc3",
"v4.10.6-rc1",
"v4.10.6",
"v5.8.0-rc2",
"v5.6.4-rc1",
"v5.6.4",
"v5.7.1-rc1",
"v5.7.1",
"v5.8.0-rc1",
"v5.6.3-rc1",
"v5.6.3",
"v5.7.0-rc6",
"v5.7.0",
"v4.10.5-rc1",
"v4.10.5",
"v4.10.4-rc1",
"v4.10.4",
"v5.6.2-rc1",
"v5.6.2",
"v5.6.1-rc3",
"v5.6.1-rc2",
"v5.6.1-rc1",
"v5.6.1",
"v5.6.0-rc6",
"v5.6.0",
"v4.10.3-rc1",
"v4.10.3",
"v4.10.2-rc1",
"v4.10.2",
"v4.10.1-rc1",
"v4.10.1",
"v4.10.0-rc5",
"v4.10.0-rc4",
"v4.10.0",
"v4.10.0-rc3",
"v4.10.0-rc2",
"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-2019-20880.json"
}
}
],
"modified": "2026-10-24T10:30:15.630618925Z",
"provider": "osv",
"references": [
"https://mattermost.com/security-updates/"
],
"provider_metadata": {}
},
"related_cves": [
{
"value": "CVE-2019-20880",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 429192,
"published_at": "2020-06-19T17:15:13.49+00:00"
}