CVE-2026-53606 sanitize-html has an incomplete URI scheme validation that allows javascript: URIs through action, formaction, data, poster, and background attributes

ApostropheCMS is an open-source Node.js content management system, and sanitize-html provides a simple HTML sanitizer with a clear API. Versions of sanitize-html prior to 2.17.5 use allowedSchemesAppliedToAttributes default: 'href', 'src', 'cite' to gate the naughtyHref function that blocks...

CVE-2026-53606

A CVE-2026-53606 entry concerns ApostropheCMS (Node.js) and its dependency sanitize-html. The issue arises in sanitize-html versions prior to 2.17.5, where allowedSchemesAppliedToAttributes (default: ['href','src','cite']) do not cover all URI-bearing attributes (e.g., action, formaction, data, p...

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'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...

PT-2026-44727

Name of the Vulnerable Software and Affected Versions symfony/html-sanitizer versions prior to 6.4 Description The UrlAttributeSanitizer visitor fails to validate the schemes of several URL-valued attributes because they are missing from the getSupportedAttributes list. Specifically, the action...

Cross-site Scripting (XSS)

Overview symfony/html-sanitizer is a Provides an object-oriented API to sanitize untrusted HTML input for safe insertion into a document's DOM. Affected versions of this package are vulnerable to Cross-site Scripting XSS via incomplete URL attribute validation in UrlAttributeSanitizer. An attacke...

CVE-2026-1915

The Simple Plyr plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'poster' parameter in the 'plyr' shortcode in all versions up to, and including, 0.0.1 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for...

CVE-2026-1915 Simple Plyr <= 0.0.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'poster' Shortcode Attribute

The Simple Plyr plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'poster' parameter in the 'plyr' shortcode in all versions up to, and including, 0.0.1 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for...

CVE-2026-1915 Simple Plyr <= 0.0.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'poster' Shortcode Attribute

The Simple Plyr plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'poster' parameter in the 'plyr' shortcode in all versions up to, and including, 0.0.1 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for...

CVE-2026-1915

CVE-2026-1915 concerns the WordPress plugin Simple Plyr (

WordPress Simple Plyr plugin <= 0.0.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'poster' Shortcode Attribute vulnerability

Authenticated Contributor+ Stored Cross-Site Scripting via 'poster' Shortcode Attribute vulnerability discovered by Gilang - DJ in WordPress Plugin Simple Plyr versions = 0.0.1...

CentOS 7 : thunderbird (RHSA-2022:9079)

The remote CentOS Linux 7 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2022:9079 advisory. - If a Thunderbird user quoted from an HTML email, for example by replying to the email, and the email contained either a VIDEO tag with the POSTER...

CVE-2022-45414

If a Thunderbird user quoted from an HTML email, for example by replying to the email, and the email contained either a VIDEO tag with the POSTER attribute or an OBJECT tag with a DATA attribute, a network request to the referenced remote URL was performed, regardless of a configuration to block...

Mozilla: Quoting from an HTML email with certain tags will trigger network requests and load remote content, regardless of a configuration to block remote content

The Mozilla Foundation Security Advisory describes this flaw as: If a Thunderbird user quoted from an HTML email and the email contained either a video tag with the poster attribute or an object tag with a data attribute, a network request to the referenced remote URL was performed regardless of ...

CVE-2026-45753: HtmlSanitizer UrlAttributeSanitizer Omits action/formaction/poster/cite: javascript: URI Survives Sanitization (XSS)

More info at https://symfony.com/cve-2026-45753...