CVE-2026-19418 (GCVE-0-2026-19418)
Vulnerability from cvelistv5 – Published: 2026-08-11 07:29 – Updated: 2026-08-11 13:21
VLAI
EPSS
VEX
Title
TYPO3 CMS - Broken Access Control in Backend and Install Tool
Summary
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.
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.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
Assigner
References
5 references
Impacted products
Credits
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As a consequence, requests originating from any script running on one of the TYPO3 instance\u0027s own domains, such as a frontend page, were accepted by backend routes and Install Tool endpoints.\u003c/div\u003e\u003cdiv\u003eAttackers able to execute JavaScript on one of those domains, for instance by exploiting a cross-site scripting vulnerability, could invoke these endpoints via \u003ccode\u003eFetch\u003c/code\u003e/\u003ccode\u003eXHR\u003c/code\u003e with the privileges of an authenticated victim\u0027s user session. 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"cveMetadata": "{\"cveId\": \"CVE-2026-19418\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-11T13:21:08.298Z\", \"dateReserved\": \"2026-08-10T10:44:33.352Z\", \"assignerOrgId\": \"f4fb688c-4412-4426-b4b8-421ecf27b14a\", \"datePublished\": \"2026-08-11T07:29:37.478Z\", \"assignerShortName\": \"TYPO3\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
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