{"api_version":"1","generated_at":"2026-08-11T11:30:34+00:00","cve":"CVE-2026-19418","urls":{"html":"https://cve.report/CVE-2026-19418","api":"https://cve.report/api/cve/CVE-2026-19418.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-19418","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-19418"},"summary":{"title":"TYPO3 CMS - Broken Access Control in Backend and Install Tool","description":"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.","state":"PUBLISHED","assigner":"TYPO3","published_at":"2026-08-11 08:17:20","updated_at":"2026-08-11 09:17:13"},"problem_types":["CWE-346","CWE-352","CWE-346 CWE-346 Origin Validation Error","CWE-352 CWE-352 Cross-Site Request Forgery (CSRF)"],"metrics":[{"version":"4.0","source":"f4fb688c-4412-4426-b4b8-421ecf27b14a","type":"Secondary","score":"7.3","severity":"HIGH","vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","data":{"version":"4.0","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","baseScore":7.3,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"LOW","userInteraction":"ACTIVE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","confidentialityRequirement":"NOT_DEFINED","integrityRequirement":"NOT_DEFINED","availabilityRequirement":"NOT_DEFINED","modifiedAttackVector":"NOT_DEFINED","modifiedAttackComplexity":"NOT_DEFINED","modifiedAttackRequirements":"NOT_DEFINED","modifiedPrivilegesRequired":"NOT_DEFINED","modifiedUserInteraction":"NOT_DEFINED","modifiedVulnConfidentialityImpact":"NOT_DEFINED","modifiedVulnIntegrityImpact":"NOT_DEFINED","modifiedVulnAvailabilityImpact":"NOT_DEFINED","modifiedSubConfidentialityImpact":"NOT_DEFINED","modifiedSubIntegrityImpact":"NOT_DEFINED","modifiedSubAvailabilityImpact":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED"}},{"version":"4.0","source":"CNA","type":"CVSS","score":"7.3","severity":"HIGH","vector":"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","data":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":7.3,"baseSeverity":"HIGH","exploitMaturity":"NOT_DEFINED","privilegesRequired":"LOW","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"ACTIVE","valueDensity":"NOT_DEFINED","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","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH","vulnerabilityResponseEffort":"NOT_DEFINED"}}],"references":[{"url":"https://typo3.org/security/advisory/typo3-core-sa-2020-006","name":"https://typo3.org/security/advisory/typo3-core-sa-2020-006","refsource":"f4fb688c-4412-4426-b4b8-421ecf27b14a","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/TYPO3/typo3/commit/ae0abd329d52285fe6e92804c3608820ad45e872","name":"https://github.com/TYPO3/typo3/commit/ae0abd329d52285fe6e92804c3608820ad45e872","refsource":"f4fb688c-4412-4426-b4b8-421ecf27b14a","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/TYPO3/typo3/commit/a0e8ee06a40e959b9e7b06a4b1cb19d3a0d3dcf7","name":"https://github.com/TYPO3/typo3/commit/a0e8ee06a40e959b9e7b06a4b1cb19d3a0d3dcf7","refsource":"f4fb688c-4412-4426-b4b8-421ecf27b14a","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/TYPO3/typo3/commit/4a75e862c589c85d795d7c65dcdc835f8f413efc","name":"https://github.com/TYPO3/typo3/commit/4a75e862c589c85d795d7c65dcdc835f8f413efc","refsource":"f4fb688c-4412-4426-b4b8-421ecf27b14a","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://typo3.org/security/advisory/typo3-core-sa-2026-021","name":"https://typo3.org/security/advisory/typo3-core-sa-2026-021","refsource":"f4fb688c-4412-4426-b4b8-421ecf27b14a","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-19418","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-19418","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"TYPO3","product":"TYPO3 CMS","version":"affected 13.0.0 13.4.34 semver","platforms":[]},{"source":"CNA","vendor":"TYPO3","product":"TYPO3 CMS","version":"affected 14.0.0 14.3.6 semver","platforms":[]},{"source":"CNA","vendor":"TYPO3","product":"TYPO3 CMS","version":"affected 13.0.0 13.4.34 semver","platforms":[]},{"source":"CNA","vendor":"TYPO3","product":"TYPO3 CMS","version":"affected 14.0.0 14.3.6 semver","platforms":[]},{"source":"CNA","vendor":"TYPO3","product":"TYPO3 CMS","version":"affected 14.0.0 14.3.6 semver","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[{"source":"CNA","value":"Hổ Cao Từ","lang":"en"},{"source":"CNA","value":"Benjamin Franzke","lang":"en"}],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"collectionURL":"https://packagist.org","defaultStatus":"unaffected","modules":["Backend","Install"],"packageName":"typo3/cms-backend","product":"TYPO3 CMS","repo":"https://github.com/TYPO3/typo3","vendor":"TYPO3","versions":[{"lessThan":"13.4.34","status":"affected","version":"13.0.0","versionType":"semver"},{"lessThan":"14.3.6","status":"affected","version":"14.0.0","versionType":"semver"}]},{"collectionURL":"https://packagist.org","defaultStatus":"unaffected","modules":["Backend","Install"],"packageName":"typo3/cms-core","product":"TYPO3 CMS","repo":"https://github.com/TYPO3/typo3","vendor":"TYPO3","versions":[{"lessThan":"13.4.34","status":"affected","version":"13.0.0","versionType":"semver"},{"lessThan":"14.3.6","status":"affected","version":"14.0.0","versionType":"semver"}]},{"collectionURL":"https://packagist.org","defaultStatus":"unaffected","modules":["Backend","Install"],"packageName":"typo3/cms-install","product":"TYPO3 CMS","repo":"https://github.com/TYPO3/typo3","vendor":"TYPO3","versions":[{"lessThan":"14.3.6","status":"affected","version":"14.0.0","versionType":"semver"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:a:typo3:typo3:*:*:*:*:*:*:*:*","versionEndExcluding":"13.4.34","versionStartIncluding":"13.0.0","vulnerable":true},{"criteria":"cpe:2.3:a:typo3:typo3:*:*:*:*:*:*:*:*","versionEndExcluding":"14.3.6","versionStartIncluding":"14.0.0","vulnerable":true}],"negate":false,"operator":"OR"}],"operator":"OR"}],"credits":[{"lang":"en","type":"reporter","value":"Hổ Cao Từ"},{"lang":"en","type":"remediation developer","value":"Benjamin Franzke"}],"descriptions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"<div><span>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 </span><code>typo3/</code><span> directory.</span></div><div>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.</div><div>Attackers able to execute JavaScript on one of those domains, for instance by exploiting a cross-site scripting vulnerability, could invoke these endpoints via <code>Fetch</code>/<code>XHR</code> 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.</div>"}],"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."}],"metrics":[{"cvssV4_0":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":7.3,"baseSeverity":"HIGH","exploitMaturity":"NOT_DEFINED","privilegesRequired":"LOW","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"ACTIVE","valueDensity":"NOT_DEFINED","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","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH","vulnerabilityResponseEffort":"NOT_DEFINED"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-346","description":"CWE-346 Origin Validation Error","lang":"en","type":"CWE"},{"cweId":"CWE-352","description":"CWE-352 Cross-Site Request Forgery (CSRF)","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-08-11T08:05:01.460Z","orgId":"f4fb688c-4412-4426-b4b8-421ecf27b14a","shortName":"TYPO3"},"references":[{"tags":["vendor-advisory"],"url":"https://typo3.org/security/advisory/typo3-core-sa-2026-021"},{"name":"TYPO3-CORE-SA-2020-006 (previous fix of the same protection mechanism)","tags":["related"],"url":"https://typo3.org/security/advisory/typo3-core-sa-2020-006"},{"name":"Git commit of main branch","tags":["patch"],"url":"https://github.com/TYPO3/typo3/commit/ae0abd329d52285fe6e92804c3608820ad45e872"},{"name":"Git commit of 14.3 branch","tags":["patch"],"url":"https://github.com/TYPO3/typo3/commit/a0e8ee06a40e959b9e7b06a4b1cb19d3a0d3dcf7"},{"name":"Git commit of 13.4 branch","tags":["patch"],"url":"https://github.com/TYPO3/typo3/commit/4a75e862c589c85d795d7c65dcdc835f8f413efc"}],"source":{"discovery":"UNKNOWN"},"title":"TYPO3 CMS - Broken Access Control in Backend and Install Tool","x_generator":{"engine":"Vulnogram 1.0.1"}}},"cveMetadata":{"assignerOrgId":"f4fb688c-4412-4426-b4b8-421ecf27b14a","assignerShortName":"TYPO3","cveId":"CVE-2026-19418","datePublished":"2026-08-11T07:29:37.478Z","dateReserved":"2026-08-10T10:44:33.352Z","dateUpdated":"2026-08-11T08:05:01.460Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-11 08:17:20","lastModifiedDate":"2026-08-11 09:17:13","problem_types":["CWE-346","CWE-352","CWE-346 CWE-346 Origin Validation Error","CWE-352 CWE-352 Cross-Site Request Forgery (CSRF)"],"metrics":{"cvssMetricV40":[{"source":"f4fb688c-4412-4426-b4b8-421ecf27b14a","type":"Secondary","cvssData":{"version":"4.0","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","baseScore":7.3,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"LOW","userInteraction":"ACTIVE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","confidentialityRequirement":"NOT_DEFINED","integrityRequirement":"NOT_DEFINED","availabilityRequirement":"NOT_DEFINED","modifiedAttackVector":"NOT_DEFINED","modifiedAttackComplexity":"NOT_DEFINED","modifiedAttackRequirements":"NOT_DEFINED","modifiedPrivilegesRequired":"NOT_DEFINED","modifiedUserInteraction":"NOT_DEFINED","modifiedVulnConfidentialityImpact":"NOT_DEFINED","modifiedVulnIntegrityImpact":"NOT_DEFINED","modifiedVulnAvailabilityImpact":"NOT_DEFINED","modifiedSubConfidentialityImpact":"NOT_DEFINED","modifiedSubIntegrityImpact":"NOT_DEFINED","modifiedSubAvailabilityImpact":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED"}}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"19418","Ordinal":"1","Title":"TYPO3 CMS - Broken Access Control in Backend and Install Tool","CVE":"CVE-2026-19418","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"19418","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"TYPO3 CMS - Broken Access Control in Backend and Install Tool"}]}}}