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CVE-2026-19418— TYPO3 CMS - Broken Access Control in Backend and Install Tool

Quick assessment

Affected
TYPO3 TYPO3 CMS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

TYPO3 CMS是TYPO3组织的一款企业级内容管理系统。 TYPO3 CMS 13.0.0版本至13.4.33版本和14.0.0版本至14.3.5版本存在安全漏洞，该漏洞源于referrer验证失效，导致来自同域其他脚本的请求被接受，可能允许攻击者利用跨站脚本漏洞以受害用户会话权限调用后端及安装工具端点，造成跨站请求伪造。

CVSS 7.3 · High EPSS 0.24% · P14

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 5

VendorProduct Version RangeStatus
TYPO3 TYPO3 CMS 13.0.0< 13.4.34 affected
14.0.0< 14.3.6 affected
13.0.0< 13.4.34 affected
14.0.0< 14.3.6 affected
14.0.0< 14.3.6 affected
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I. Basic Information for CVE-2026-19418

Vulnerability Information
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Vulnerability Title
TYPO3 CMS - Broken Access Control in Backend and Install Tool
Source: CVE Program / CVE List V5
Vulnerability 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. 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
源验证错误
Source: CVE Program / CVE List V5
Vulnerability Title
TYPO3 CMS 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
TYPO3 CMS是TYPO3组织的一款企业级内容管理系统。 TYPO3 CMS 13.0.0版本至13.4.33版本和14.0.0版本至14.3.5版本存在安全漏洞，该漏洞源于referrer验证失效，导致来自同域其他脚本的请求被接受，可能允许攻击者利用跨站脚本漏洞以受害用户会话权限调用后端及安装工具端点，造成跨站请求伪造。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
TYPO3 TYPO3 CMS 13.0.0 ~ 13.4.34 -
TYPO3 TYPO3 CMS 13.0.0 ~ 13.4.34 -
TYPO3 TYPO3 CMS 14.0.0 ~ 14.3.6 -

II. Public POCs for CVE-2026-19418

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III. Intelligence Information for CVE-2026-19418

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Patches & Fixes for CVE-2026-19418 (1)

Vendor Advisories for CVE-2026-19418 (2)

IV. Related Vulnerabilities

Same product: TYPO3 CMS
Same vendor: TYPO3
Same weakness: CWE-346

V. Comments for CVE-2026-19418

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