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      <title>certfr-2026-avi-1036 — De multiples vulnérabilités ont été découvertes dans Typo3. Elles permettent à un attaquant de provoquer un contourneme…</title>
      <link>https://vulnerability.circl.lu/vuln/certfr-2026-avi-1036</link>
      <description>certfr-2026-avi-1036</description>
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      <title>fkie_cve-2026-19418</title>
      <link>https://vulnerability.circl.lu/vuln/fkie_cve-2026-19418</link>
      <description>&lt;p&gt;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&amp;#39;s main entry script instead of the dedicated typo3/ directory.&lt;/p&gt;
&lt;p&gt;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&amp;#39;s own domains, such as a frontend page, were accepted by backend routes and Install Tool endpoints.&lt;/p&gt;
&lt;p&gt;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&amp;#39;s user session. This issue affects TYPO3 CMS versions 13.0.0-13.4.33 and 14.0.0-14.3.5.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;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&amp;#39;s main entry script instead of the dedicated typo3/ directory.&lt;/p&gt;
&lt;p&gt;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&amp;#39;s own domains, such as a frontend page, were accepted by backend routes and Install Tool endpoints.&lt;/p&gt;
&lt;p&gt;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&amp;#39;s user session. This issue affects TYPO3 CMS versions 13.0.0-13.4.33 and 14.0.0-14.3.5.&lt;/p&gt;</content:encoded>
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      <title>Withdrawn: GHSA-4f2f-jr2m-j7p4 — Duplicate Advisory: TYPO3-CORE-SA-2026-021: Broken Access Control in Backend and Install Tool</title>
      <link>https://vulnerability.circl.lu/vuln/ghsa-4f2f-jr2m-j7p4</link>
      <description>&lt;p&gt;&lt;strong&gt;Withdrawn by the publisher.&lt;/strong&gt;&lt;/p&gt;
&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Packagist: typo3/cms-core&lt;/p&gt;
&lt;p&gt;## Duplicate Advisory&lt;/p&gt;
&lt;p&gt;This advisory has been withdrawn because it is a duplicate of GHSA-68jx-f42c-7599. This link is maintained to preserve external references.&lt;/p&gt;
&lt;p&gt;## Original 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&amp;#39;s main entry script instead of the dedicated typo3/ directory.&lt;/p&gt;
&lt;p&gt;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&amp;#39;s own domains, such as a frontend page, were accepted by backend routes and Install Tool endpoints.&lt;/p&gt;
&lt;p&gt;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&amp;#39;s user session. This issue affects TYPO3 CMS versions 13.0.0-13.4.33 and 14.0.0-14.3.5.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Withdrawn by the publisher.&lt;/strong&gt;&lt;/p&gt;
&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Packagist: typo3/cms-core&lt;/p&gt;
&lt;p&gt;## Duplicate Advisory&lt;/p&gt;
&lt;p&gt;This advisory has been withdrawn because it is a duplicate of GHSA-68jx-f42c-7599. This link is maintained to preserve external references.&lt;/p&gt;
&lt;p&gt;## Original 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&amp;#39;s main entry script instead of the dedicated typo3/ directory.&lt;/p&gt;
&lt;p&gt;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&amp;#39;s own domains, such as a frontend page, were accepted by backend routes and Install Tool endpoints.&lt;/p&gt;
&lt;p&gt;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&amp;#39;s user session. This issue affects TYPO3 CMS versions 13.0.0-13.4.33 and 14.0.0-14.3.5.&lt;/p&gt;</content:encoded>
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