Medium
Security advisory
TYPO3 is an open source PHP based web content management system. In TYPO3 before versions 7.6.51, 8.7.40, 9.5.25, 10.4.14, 11.1.1 it has been discovered that content elements of type _menu_ are vulnerable to cross-site scripting when their referenced items get previewed in the page module. A valid backend user account is needed to exploit this vulnerability. This is fixed in versions 7.6.51, 8.7.40, 9.5.25, 10.4.14, 11.1.1.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-21370
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 08:39 UTC · Revision 1
Source evidence
TYPO3 is an open source PHP based web content management system. In TYPO3 before versions 7.6.51, 8.7.40, 9.5.25, 10.4.14, 11.1.1 it has been discovered that content elements of type _menu_ are vulnerable to cross-site scripting when their referenced items get previewed in the page module. A valid backend user account is needed to exploit this vulnerability. This is fixed in versions 7.6.51, 8.7.40, 9.5.25, 10.4.14, 11.1.1.
osv:CVE-2021-21370
Complete source record
{
"id": "889847df0f36d1df57ddf4d77f4cdba1dcbb023d0a8e73666783869969d674b6",
"url": "https://osv.dev/vulnerability/CVE-2021-21370",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-21370",
"summary": "TYPO3 is an open source PHP based web content management system. In TYPO3 before versions 7.6.51, 8.7.40, 9.5.25, 10.4.14, 11.1.1 it has been discovered that content elements of type _menu_ are vulnerable to cross-site scripting when their referenced items get previewed in the page module. A valid backend user account is needed to exploit this vulnerability. This is fixed in versions 7.6.51, 8.7.40, 9.5.25, 10.4.14, 11.1.1.",
"evidence": "osv:CVE-2021-21370",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2021-21370",
"aliases": [
"BIT-typo3-2021-21370",
"CVE-2021-21370",
"GHSA-x7hc-x7fm-f7qh"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/TYPO3/typo3",
"type": "GIT",
"events": [
{
"introduced": "41235ff8e38c6f3401df03ae8beddd62d662c525"
},
{
"fixed": "98b19b1727f002a9d20359f7c341c7981086989f"
},
{
"introduced": "c91b70e450c52d29ffb08115fffbb7832b15a330"
},
{
"fixed": "9f8b73eb73f0f9834979641c02708dc168e36eda"
},
{
"introduced": "6a5e2d4097ef0a0e3ea955af93cf83810d6fa234"
},
{
"fixed": "67471a2b5bf30acc0225fa0860e882c056c60547"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:typo3:typo3:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "9.0.0"
},
{
"fixed": "9.5.25"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:typo3:typo3:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "10.0.0"
},
{
"fixed": "10.4.14"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:typo3:typo3:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "11.0.0"
},
{
"fixed": "11.1.1"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"v11.1.0",
"v10.4.13",
"v11.0.0",
"v10.4.12",
"v10.4.11",
"v9.5.24",
"v10.4.10",
"v9.5.23",
"v10.4.9",
"v9.5.22",
"v10.4.8",
"v10.4.7",
"v9.5.21",
"v10.4.6",
"v9.5.20",
"v10.4.5",
"v10.4.4",
"v9.5.19",
"v10.4.3",
"v9.5.18",
"v9.5.17",
"v10.4.2",
"v10.4.1",
"v9.5.16",
"v10.4.0",
"v9.5.15",
"v10.3.0",
"v9.5.14",
"v9.5.13",
"v9.5.12",
"v10.2.0",
"v9.5.11",
"v9.5.10",
"v10.1.0",
"v9.5.9",
"v10.0.0",
"v9.5.8",
"v9.5.7",
"v9.5.6",
"v9.5.5",
"v9.5.4",
"v9.5.3",
"v9.5.2",
"v9.5.1",
"v9.5.0",
"v9.4.0",
"v9.3.0",
"v9.2.0",
"v9.1.0",
"v9.0.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-21370.json"
}
},
{
"ranges": [
{
"repo": "https://github.com/typo3/typo3",
"type": "GIT",
"events": [
{
"introduced": "41235ff8e38c6f3401df03ae8beddd62d662c525"
},
{
"fixed": "98b19b1727f002a9d20359f7c341c7981086989f"
},
{
"introduced": "c91b70e450c52d29ffb08115fffbb7832b15a330"
},
{
"fixed": "9f8b73eb73f0f9834979641c02708dc168e36eda"
},
{
"introduced": "6a5e2d4097ef0a0e3ea955af93cf83810d6fa234"
},
{
"fixed": "67471a2b5bf30acc0225fa0860e882c056c60547"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:typo3:typo3:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "9.0.0"
},
{
"fixed": "9.5.25"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:typo3:typo3:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "10.0.0"
},
{
"fixed": "10.4.14"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:typo3:typo3:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "11.0.0"
},
{
"fixed": "11.1.1"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"v11.1.0",
"v10.4.13",
"v11.0.0",
"v10.4.12",
"v10.4.11",
"v9.5.24",
"v10.4.10",
"v9.5.23",
"v10.4.9",
"v9.5.22",
"v10.4.8",
"v10.4.7",
"v9.5.21",
"v10.4.6",
"v9.5.20",
"v10.4.5",
"v10.4.4",
"v9.5.19",
"v10.4.3",
"v9.5.18",
"v9.5.17",
"v10.4.2",
"v10.4.1",
"v9.5.16",
"v10.4.0",
"v9.5.15",
"v10.3.0",
"v9.5.14",
"v9.5.13",
"v9.5.12",
"v10.2.0",
"v9.5.11",
"v9.5.10",
"v10.1.0",
"v9.5.9",
"v10.0.0",
"v9.5.8",
"v9.5.7",
"v9.5.6",
"v9.5.5",
"v9.5.4",
"v9.5.3",
"v9.5.2",
"v9.5.1",
"v9.5.0",
"v9.4.0",
"v9.3.0",
"v9.2.0",
"v9.1.0",
"v9.0.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-21370.json"
}
}
],
"modified": "2026-10-24T10:47:52.766935624Z",
"provider": "osv",
"references": [
"https://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-x7hc-x7fm-f7qh",
"https://packagist.org/packages/typo3/cms-backend",
"https://typo3.org/security/advisory/typo3-core-sa-2021-008"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:a:typo3:typo3:*:*:*:*:*:*:*:*"
],
"vendor_product": "typo3:typo3",
"extracted_events": [
{
"range": [
{
"introduced": "7.0.0"
},
{
"fixed": "7.6.51"
},
{
"introduced": "7.0.0"
},
{
"fixed": "7.6.51"
},
{
"introduced": "7.0.0"
},
{
"fixed": "7.6.51"
},
{
"introduced": "8.0.0"
},
{
"fixed": "8.7.40"
},
{
"introduced": "8.0.0"
},
{
"fixed": "8.7.40"
},
{
"introduced": "8.0.0"
},
{
"fixed": "8.7.40"
},
{
"introduced": "9.0.0"
},
{
"fixed": "9.5.25"
},
{
"introduced": "10.0.0"
},
{
"fixed": "10.4.14"
},
{
"introduced": "11.0.0"
},
{
"fixed": "11.1.1"
}
],
"source": "CPE_RANGE"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2021-21370",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 441590,
"published_at": "2021-03-23T02:15:12.987+00:00"
}