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-2026-47345

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 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-2026-42557

jupyterlab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. Prior to 4.5.7, JupyterLab's HTML sanitizer allowlists data-commandlinker-command and data-commandlinker-args on button elements, while CommandLinker listens for all cli...

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...

PT-2026-44133

Description SymfonyComponentHtmlSanitizerTextSanitizerUrlSanitizer::parse used by UrlSanitizer::sanitize and therefore by every HtmlSanitizer config that allows links or media accepts URLs that contain Unicode explicit-direction BiDi formatting characters: U+202A–U+202E LRE / RLE / PDF / LRO / RL...

PT-2026-44135

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-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...

CVE-2026-26028

CryptPad is an end-to-end encrypted collaborative office suite. In versions prior to 2026.2.0, the HTML sanitizer in Diffmarked.js can be bypassed due to incomplete attribute filtering on restricted tags. The sanitizer validates only the src attribute of , , and elements, leaving all other...

EUVD-2026-31154

CryptPad is an end-to-end encrypted collaborative office suite. In versions prior to 2026.2.0, the HTML sanitizer in Diffmarked.js can be bypassed due to incomplete attribute filtering on restricted tags. The sanitizer validates only the src attribute of , , and elements, leaving all other...

UBUNTU-CVE-2026-42557

jupyterlab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. Prior to 4.5.7, JupyterLab's HTML sanitizer allowlists data-commandlinker-command and data-commandlinker-args on button elements, while CommandLinker listens for all cli...

CVE-2026-42557

jupyterlab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. Prior to 4.5.7, JupyterLab's HTML sanitizer allowlists data-commandlinker-command and data-commandlinker-args on button elements, while CommandLinker listens for all cli...

CVE-2026-42557

CVE-2026-42557 affects JupyterLab prior to 4.5.7. The HTML sanitizer allowedlist for button elements included data-commandlinker-command and data-commandlinker-args, while CommandLinker listens for all click events on document.body and may execute the named command without validating the source U...

CVE-2026-42557

jupyterlab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. Prior to 4.5.7, JupyterLab's HTML sanitizer allowlists data-commandlinker-command and data-commandlinker-args on button elements, while CommandLinker listens for all cli...

JupyterLab's command linker attributes in HTML enable one-click command execution from untrusted content

JupyterLab's HTML sanitizer allowlists data-commandlinker-command and data-commandlinker-args on button elements, while CommandLinker listens for all click events on document.body and executes the named command without checking whether the element came from trusted JupyterLab UI. A notebook with ...

UBUNTU-CVE-2026-41239

DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Starting in version 1.0.10 and prior to version 3.4.0, SAFEFORTEMPLATES strips ... expressions from untrusted HTML. This works in string mode but not with RETURNDOM or RETURNDOMFRAGMENT, allowing XSS via...

UBUNTU-CVE-2026-41238

DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Versions 3.0.1 through 3.3.3 are vulnerable to a prototype pollution-based XSS bypass. When an application uses DOMPurify.sanitize with the default configuration no CUSTOMELEMENTHANDLING option, a prior prototype...

PT-2026-33376

SiYuan is an open-source personal knowledge management system. In versions 3.6.1 through 3.6.3, a prior fix for XSS in bazaar README rendering incomplete fix for CVE-2026-33066 enabled the Lute HTML sanitizer, but the sanitizer does not block iframe tags, and its URL-prefix blocklist does not...

Cross-site Scripting (XSS)

Overview loofah is a general library for manipulating and transforming HTML/XML documents and fragments, built on top of Nokogiri. Affected versions of this package are vulnerable to Cross-site Scripting XSS in the Loofah::HTML5::Scrub.alloweduri? function. An attacker can inject malicious script...