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"state": "PUBLISHED",
"assignerShortName": "TYPO3",
"dateReserved": "2026-08-10T10:44:33.352Z",
"datePublished": "2026-08-11T07:29:37.478Z",
"dateUpdated": "2026-08-11T13:21:08.298Z"
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"shortName": "TYPO3",
"dateUpdated": "2026-08-11T08:05:01.460Z"
},
"title": "TYPO3 CMS - Broken Access Control in Backend and Install Tool",
"problemTypes": [
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"descriptions": [
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"lang": "en",
"cweId": "CWE-346",
"description": "CWE-346 Origin Validation Error",
"type": "CWE"
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{
"lang": "en",
"cweId": "CWE-352",
"description": "CWE-352 Cross-Site Request Forgery (CSRF)",
"type": "CWE"
}
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}
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"affected": [
{
"vendor": "TYPO3",
"product": "TYPO3 CMS",
"collectionURL": "https://packagist.org",
"packageName": "typo3/cms-backend",
"repo": "https://github.com/TYPO3/typo3",
"modules": [
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"Install"
],
"versions": [
{
"status": "affected",
"version": "13.0.0",
"lessThan": "13.4.34",
"versionType": "semver"
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{
"status": "affected",
"version": "14.0.0",
"lessThan": "14.3.6",
"versionType": "semver"
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"product": "TYPO3 CMS",
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"Install"
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"repo": "https://github.com/TYPO3/typo3",
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"version": "14.0.0",
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"criteria": "cpe:2.3:a:typo3:typo3:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "13.0.0",
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"value": "The referrer enforcement introduced with TYPO3-CORE-SA-2020-006 (CVE-2020-11069) became ineffective in TYPO3 v13.0, where TYPO3 CMS started serving the backend and Install Tool applications from the site's main entry script instead of the dedicated typo3/ directory.\n\nWhether a request originated from the backend or Install Tool itself was determined by comparing the referrer against the directory of the entry script, which since then is the site root. As a consequence, requests originating from any script running on one of the TYPO3 instance's own domains, such as a frontend page, were accepted by backend routes and Install Tool endpoints.\n\nAttackers able to execute JavaScript on one of those domains, for instance by exploiting a cross-site scripting vulnerability, could invoke these endpoints via Fetch/XHR with the privileges of an authenticated victim's user session. This issue affects TYPO3 CMS versions 13.0.0-13.4.33 and 14.0.0-14.3.5.",
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Whether a request originated from the backend or Install Tool itself was determined by comparing the referrer against the directory of the entry script, which since then is the site root. As a consequence, requests originating from any script running on one of the TYPO3 instance's own domains, such as a frontend page, were accepted by backend routes and Install Tool endpoints.
Attackers able to execute JavaScript on one of those domains, for instance by exploiting a cross-site scripting vulnerability, could invoke these endpoints via Fetch/XHR with the privileges of an authenticated victim's user session. This issue affects TYPO3 CMS versions 13.0.0-13.4.33 and 14.0.0-14.3.5.
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}
]
}
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"references": [
{
"url": "https://typo3.org/security/advisory/typo3-core-sa-2026-021",
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"url": "https://typo3.org/security/advisory/typo3-core-sa-2020-006",
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"url": "https://github.com/TYPO3/typo3/commit/ae0abd329d52285fe6e92804c3608820ad45e872",
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}
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"valueDensity": "NOT_DEFINED",
"vulnerabilityResponseEffort": "NOT_DEFINED",
"providerUrgency": "NOT_DEFINED",
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"baseScore": 7.3,
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
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"credits": [
{
"lang": "en",
"value": "Hổ Cao Từ",
"type": "reporter"
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{
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"value": "Benjamin Franzke",
"type": "remediation developer"
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"title": "CISA ADP Vulnrichment",
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