TYPO3-CORE-SA-2026-006: TYPO3 HTML Sanitizer allows Cross-Site Scripting

More info at https://typo3.org/security/advisory/typo3-core-sa-2026-006...

TYPO3-CORE-SA-2026-006: TYPO3 HTML Sanitizer allows Cross-Site Scripting

More info at https://typo3.org/security/advisory/typo3-core-sa-2026-006...

CVE-2026-47345

Namespace attributes are not encoded correctly during HTML serialization. This allows bypassing the cross-site scripting prevention mechanism of typo3/html-sanitizer before version 2.3.2...

CVE-2026-47345

The CVE-2026-47345 issue affects the TYPO3 html-sanitizer component prior to version 2.3.2, where namespace attributes are not encoded correctly during HTML serialization, enabling bypass of the built-in XSS prevention. The underlying impact is a cross-site scripting risk in affected TYPO3 deploy...

CVE-2026-47345 TYPO3 HTML Sanitizer allows Cross-Site Scripting

Namespace attributes are not encoded correctly during HTML serialization. This allows bypassing the cross-site scripting prevention mechanism of typo3/html-sanitizer before version 2.3.2...

CVE-2026-47345 TYPO3 HTML Sanitizer allows Cross-Site Scripting

Namespace attributes are not encoded correctly during HTML serialization. This allows bypassing the cross-site scripting prevention mechanism of typo3/html-sanitizer before version 2.3.2...

CVE-2026-47344 TYPO3 HTML Sanitizer allows Cross-Site Scripting

When ALLOWINSECURERAWTEXT is enabled, whitespace-variant closing tags e.g., are not recognized by the sanitizer but accepted by browsers as valid end tags, allowing subsequent content to escape sanitization. This allows bypassing the cross-site scripting prevention mechanism of typo3/html-sanitiz...

CVE-2026-47344

When ALLOWINSECURERAWTEXT is enabled, whitespace-variant closing tags e.g., are not recognized by the sanitizer but accepted by browsers as valid end tags, allowing subsequent content to escape sanitization. This allows bypassing the cross-site scripting prevention mechanism of typo3/html-sanitiz...

CVE-2026-47344 TYPO3 HTML Sanitizer allows Cross-Site Scripting

When ALLOWINSECURERAWTEXT is enabled, whitespace-variant closing tags e.g., are not recognized by the sanitizer but accepted by browsers as valid end tags, allowing subsequent content to escape sanitization. This allows bypassing the cross-site scripting prevention mechanism of typo3/html-sanitiz...

PT-2026-47449

Name of the Vulnerable Software and Affected Versions typo3/html-sanitizer versions prior to 2.3.2 Description Namespace attributes are not encoded correctly during HTML serialization. This flaw allows the cross-site scripting prevention mechanism to be bypassed. Cross-site scripting is a techniq...

PT-2026-47448

Name of the Vulnerable Software and Affected Versions typo3/html-sanitizer versions prior to 2.3.2 Description When the ALLOW INSECURE RAW TEXT setting is enabled, the sanitizer fails to recognize closing tags containing whitespace variants, such as . Because browsers interpret these as valid end...

CVE-2026-42557

A flaw was found in jupyterlab. This vulnerability allows a remote attacker to achieve arbitrary code execution by presenting a user with a specially crafted notebook containing a deceptive button in its pre-saved HTML cell output. When the user clicks this button, the CommandLinker component...

CVE-2026-48527

HAX CMS helps manage microsite universe with PHP or NodeJs backends. Versions up to and including 26.0.0 are affected by a stored cross-site scripting XSS vulnerability in the /system/api/saveNode endpoint. An authenticated user with a permission to edit pages can bypass the HTML sanitizer by...

CVE-2026-48527 HaxCMS has a stored Cross-Site Scripting (XSS) bypass in saveNode endpoint

HAX CMS helps manage microsite universe with PHP or NodeJs backends. Versions up to and including 26.0.0 are affected by a stored cross-site scripting XSS vulnerability in the /system/api/saveNode endpoint. An authenticated user with a permission to edit pages can bypass the HTML sanitizer by...

CVE-2026-48527 HaxCMS has a stored Cross-Site Scripting (XSS) bypass in saveNode endpoint

HAX CMS helps manage microsite universe with PHP or NodeJs backends. Versions up to and including 26.0.0 are affected by a stored cross-site scripting XSS vulnerability in the /system/api/saveNode endpoint. An authenticated user with a permission to edit pages can bypass the HTML sanitizer by...

GHSA-HHG7-C65M-H7FF Symfony's HtmlSanitizer UrlAttributeSanitizer Omits action/formaction/poster/cite — `javascript`: URI Survives Sanitization (XSS)

Description symfony/html-sanitizer lets applications sanitise untrusted HTML. UrlAttributeSanitizer is the visitor responsible for validating URL-valued attributes and stripping dangerous schemes from them; it runs on every element regardless of configuration. Whether an attribute is kept is...

Symfony has an HtmlSanitizer allowLinkHosts() / allowMediaHosts() Bypass via URL-Parser Differentials and <area> Misclassification

Description symfony/html-sanitizer lets applications sanitise untrusted HTML. The configuration methods allowLinkHosts... and allowLinkSchemes... are intended to restrict targets to an allowlist of hosts/schemes; allowMediaHosts / allowMediaSchemes do the same for etc. Three distinct bypasses all...

GHSA-QC95-4862-92FH Symfony has an HtmlSanitizer allowLinkHosts() / allowMediaHosts() Bypass via URL-Parser Differentials and <area> Misclassification

Description symfony/html-sanitizer lets applications sanitise untrusted HTML. The configuration methods allowLinkHosts... and allowLinkSchemes... are intended to restrict targets to an allowlist of hosts/schemes; allowMediaHosts / allowMediaSchemes do the same for etc. Three distinct bypasses all...

CryptPad has a Sanitizer Bypass in Diffmarked.js that Allows Arbitrary HTML Injection and Potential XSS

Summary CryptPad’s HTML sanitizer in Diffmarked.js can be bypassed due to incomplete filtering of restricted tags. Because the sanitizer only validates the src attribute of , and elements, and does not restrict other attributes, an attacker can inject arbitrary HTML through srcdoc. This completel...

GHSA-G2G4-47GV-P72V CryptPad has a Sanitizer Bypass in Diffmarked.js that Allows Arbitrary HTML Injection and Potential XSS

Summary CryptPad’s HTML sanitizer in Diffmarked.js can be bypassed due to incomplete filtering of restricted tags. Because the sanitizer only validates the src attribute of , and elements, and does not restrict other attributes, an attacker can inject arbitrary HTML through srcdoc. This completel...