Security advisory
In TYPO3 CMS greater than or equal to 9.0.0 and less than 9.5.20, and greater than or equal to 10.0.0 and less than 10.4.6, it has been discovered that an internal verification mechanism can be used to generate arbitrary checksums. This allows to inject arbitrary data having a valid cryptographic message authentication code (HMAC-SHA1) and can lead to various attack chains including potential privilege escalation, insecure deserialization & remote code execution. The overall severity of this vulnerability is high based on mentioned attack chains and the requirement of having a valid backend user session (authenticated). This has been patched in versions 9.5.20 and 10.4.6.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2020-15098
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 08:46 UTC · Revision 1
Source evidence
In TYPO3 CMS greater than or equal to 9.0.0 and less than 9.5.20, and greater than or equal to 10.0.0 and less than 10.4.6, it has been discovered that an internal verification mechanism can be used to generate arbitrary checksums. This allows to inject arbitrary data having a valid cryptographic message authentication code (HMAC-SHA1) and can lead to various attack chains including potential privilege escalation, insecure deserialization & remote code execution. The overall severity of this vulnerability is high based on mentioned attack chains and the requirement of having a valid backend user session (authenticated). This has been patched in versions 9.5.20 and 10.4.6.
osv:CVE-2020-15098
Complete source record
{
"id": "3d3d4b29409c29aff4140c51e6b8015fe0371c032db930da9385fa0dcdbed154",
"url": "https://osv.dev/vulnerability/CVE-2020-15098",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2020-15098",
"summary": "In TYPO3 CMS greater than or equal to 9.0.0 and less than 9.5.20, and greater than or equal to 10.0.0 and less than 10.4.6, it has been discovered that an internal verification mechanism can be used to generate arbitrary checksums. This allows to inject arbitrary data having a valid cryptographic message authentication code (HMAC-SHA1) and can lead to various attack chains including potential privilege escalation, insecure deserialization & remote code execution. The overall severity of this vulnerability is high based on mentioned attack chains and the requirement of having a valid backend user session (authenticated). This has been patched in versions 9.5.20 and 10.4.6.",
"evidence": "osv:CVE-2020-15098",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2020-15098",
"aliases": [
"BIT-typo3-2020-15098",
"CVE-2020-15098",
"GHSA-m5vr-3m74-jwxp"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/TYPO3/typo3",
"type": "GIT",
"events": [
{
"introduced": "41235ff8e38c6f3401df03ae8beddd62d662c525"
},
{
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{
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{
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}
],
"database_specific": {
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{
"cpe": "cpe:2.3:a:typo3:typo3:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "9.0.0"
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{
"fixed": "9.5.20"
}
],
"source": "CPE_RANGE"
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{
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{
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}
]
}
}
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"versions": [
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"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": {
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}
},
{
"ranges": [
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"events": [
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{
"fixed": "9c66a63af802a9a3da54e21dfd32a8e6acbc0e89"
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{
"introduced": "c91b70e450c52d29ffb08115fffbb7832b15a330"
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{
"fixed": "4ec29fe14dc3b6af2712c1279173ad669a5da26d"
},
{
"fixed": "85d3e70dff35a99ef53f4b561114acfa9e5c47e1"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:typo3:typo3:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "9.0.0"
},
{
"fixed": "9.5.20"
}
],
"source": "CPE_RANGE"
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{
"cpe": "cpe:2.3:a:typo3:typo3:*:*:*:*:*:*:*:*",
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{
"range": [
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],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
"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-2020-15098.json"
}
}
],
"modified": "2026-10-24T10:50:05.353097825Z",
"provider": "osv",
"references": [
"https://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-m5vr-3m74-jwxp",
"https://typo3.org/security/advisory/typo3-core-sa-2016-013",
"https://typo3.org/security/advisory/typo3-core-sa-2020-008",
"https://github.com/TYPO3/TYPO3.CMS/commit/85d3e70dff35a99ef53f4b561114acfa9e5c47e1"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:a:typo3:typo3:*:*:*:*:*:*:*:*"
],
"vendor_product": "typo3:typo3",
"extracted_events": [
{
"range": [
{
"introduced": "9.0.0"
},
{
"fixed": "9.5.20"
},
{
"introduced": "10.0.0"
},
{
"fixed": "10.4.6"
}
],
"source": "CPE_RANGE"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2020-15098",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 441947,
"published_at": "2020-07-29T17:15:13.387+00:00"
}