Medium
Security advisory
TYPO3 is an open source PHP based web content management system. In TYPO3 before versions 6.2.57, 7.6.51, 8.7.40, 9.5.25, 10.4.14, 11.1.1 it has been discovered that Login Handling is susceptible to open redirection which allows attackers redirecting to arbitrary content, and conducting phishing attacks. No authentication is required in order to exploit this vulnerability. This is fixed in versions 6.2.57, 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-2021-21338
- 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 6.2.57, 7.6.51, 8.7.40, 9.5.25, 10.4.14, 11.1.1 it has been discovered that Login Handling is susceptible to open redirection which allows attackers redirecting to arbitrary content, and conducting phishing attacks. No authentication is required in order to exploit this vulnerability. This is fixed in versions 6.2.57, 7.6.51, 8.7.40, 9.5.25, 10.4.14, 11.1.1.
osv:CVE-2021-21338
Complete source record
{
"id": "ca27db9c40d7690bf36bec34d6f7115db070191919498c88ea7c6dbd4b362790",
"url": "https://osv.dev/vulnerability/CVE-2021-21338",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-21338",
"summary": "TYPO3 is an open source PHP based web content management system. In TYPO3 before versions 6.2.57, 7.6.51, 8.7.40, 9.5.25, 10.4.14, 11.1.1 it has been discovered that Login Handling is susceptible to open redirection which allows attackers redirecting to arbitrary content, and conducting phishing attacks. No authentication is required in order to exploit this vulnerability. This is fixed in versions 6.2.57, 7.6.51, 8.7.40, 9.5.25, 10.4.14, 11.1.1.",
"evidence": "osv:CVE-2021-21338",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2021-21338",
"aliases": [
"BIT-typo3-2021-21338",
"CVE-2021-21338",
"GHSA-4jhw-2p6j-5wmp"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/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"
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{
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{
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},
{
"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"
},
{
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"range": [
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{
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"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:typo3:typo3:*:*:*:*:*:*:*:*",
"range": [
{
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{
"fixed": "11.1.1"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
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"v10.4.13",
"v11.0.0",
"v10.4.12",
"v10.4.11",
"v9.5.24",
"v10.4.10",
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"v9.5.6",
"v9.5.5",
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"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-2021-21338.json"
}
},
{
"ranges": [
{
"repo": "https://github.com/typo3/typo3",
"type": "GIT",
"events": [
{
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},
{
"fixed": "98b19b1727f002a9d20359f7c341c7981086989f"
},
{
"introduced": "c91b70e450c52d29ffb08115fffbb7832b15a330"
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{
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},
{
"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": [
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},
{
"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": [
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"v10.4.13",
"v11.0.0",
"v10.4.12",
"v10.4.11",
"v9.5.24",
"v10.4.10",
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"v10.4.7",
"v9.5.21",
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"v10.4.1",
"v9.5.16",
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"v9.5.13",
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"v9.5.6",
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-21338.json"
}
}
],
"modified": "2026-10-24T10:47:52.683464228Z",
"provider": "osv",
"references": [
"https://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-4jhw-2p6j-5wmp",
"https://packagist.org/packages/typo3/cms-core",
"https://typo3.org/security/advisory/typo3-core-sa-2021-001"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:a:typo3:typo3:*:*:*:*:*:*:*:*"
],
"vendor_product": "typo3:typo3",
"extracted_events": [
{
"range": [
{
"introduced": "6.2.0"
},
{
"fixed": "6.2.57"
},
{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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}
],
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}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2021-21338",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 441589,
"published_at": "2021-03-23T02:15:12.36+00:00"
}