CVE-2026-56735

Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.2 and 7.1.0, zammad's HTML sanitizer HtmlSanitizer::Strict blocks external URLs in to prevent remote content loading, but the srcset attribute, also allowlisted for , is not subject to the same check. This oversight...

EUVD-2026-87215

Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.2 and 7.1.0, zammad's HTML sanitizer HtmlSanitizer::Strict blocks external URLs in to prevent remote content loading, but the srcset attribute, also allowlisted for , is not subject to the same check. This oversight...

CVE-2026-56735 Zammad: Improper neutralization of `srcset` attribute in IMG tags in Zammad

Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.2 and 7.1.0, zammad's HTML sanitizer HtmlSanitizer::Strict blocks external URLs in to prevent remote content loading, but the srcset attribute, also allowlisted for , is not subject to the same check. This oversight...

CVE-2026-56735

The open source helpdesk system Zammad is vulnerable to an oversight in its HTML sanitizer (HtmlSanitizer::Strict ). Prior to versions 7.0.2 and 7.1.0 , the sanitizer blocked external URLs in tags but failed to apply the same check to the srcset attribute. An attacker can bypass external content...

CVE-2026-56735 Zammad: Improper neutralization of `srcset` attribute in IMG tags in Zammad

Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.2 and 7.1.0, zammad's HTML sanitizer HtmlSanitizer::Strict blocks external URLs in to prevent remote content loading, but the srcset attribute, also allowlisted for , is not subject to the same check. This oversight...

CVE-2026-56735 Zammad: Improper neutralization of `srcset` attribute in IMG tags in Zammad

Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.2 and 7.1.0, zammad's HTML sanitizer HtmlSanitizer::Strict blocks external URLs in to prevent remote content loading, but the srcset attribute, also allowlisted for , is not subject to the same check. This oversight...

GHSA-QXG3-46RW-79J8 code16 Sharp vulnerable to stored XSS via iframe srcdoc Attribute

Impact A Stored Cross-Site Scripting XSS vulnerability exists in the rich text editor due to improper sanitization of the srcdoc attribute on elements. While the underlying Symfony HtmlSanitizer correctly HTML-encodes special characters inside the attribute value e.g., converting to script, the...

code16 Sharp vulnerable to stored XSS via iframe srcdoc Attribute

Impact A Stored Cross-Site Scripting XSS vulnerability exists in the rich text editor due to improper sanitization of the srcdoc attribute on elements. While the underlying Symfony HtmlSanitizer correctly HTML-encodes special characters inside the attribute value e.g., converting to script, the...

PT-2026-98949

Name of the Vulnerable Software and Affected Versions Zammad versions prior to 7.0.2 Zammad versions prior to 7.1.0 Description The HTML sanitizer HtmlSanitizer::Strict fails to block external URLs within the srcset attribute of tags. While other external URLs are blocked to prevent remote conten...

CVE-2026-56735: Improper Neutralization of Script in Attributes of IMG Tags in a Web Page

Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.2 and 7.1.0, zammad's HTML sanitizer HtmlSanitizer::Strict blocks external URLs in to prevent remote content loading, but the srcset attribute, also allowlisted for , is not subject to the same check. This oversight...

CVE-2026-48760 Symfony: HtmlSanitizer URL Parser Deny Gates Underinclusive: Percent-Encoded BiDi Marks and Unicode Whitespace Bypass Visual-Spoofing Defense

Symfony is a PHP framework for web and console applications and a set of reusable PHP components. From 6.1.0 until 6.4.41, 7.4.13, and 8.0.13, UrlSanitizer::parse rejected raw BiDi formatting characters but not percent-encoded forms and used an ASCII-only whitespace check, allowing sanitized URLs...

CVE-2026-45064 Symfony: HtmlSanitizer URL Attributes Pass Through BiDi Override Characters → Visual href Spoofing

Symfony is a PHP framework for web and console applications and a set of reusable PHP components. From 6.1.0-BETA1 until 6.4.40, 7.4.12, and 8.0.12, UrlSanitizer::parse passes Unicode explicit-direction BiDi formatting characters through into sanitized href and src attributes, allowing sanitized...

CVE-2026-45064 Symfony: HtmlSanitizer URL Attributes Pass Through BiDi Override Characters → Visual href Spoofing

Symfony is a PHP framework for web and console applications and a set of reusable PHP components. From 6.1.0-BETA1 until 6.4.40, 7.4.12, and 8.0.12, UrlSanitizer::parse passes Unicode explicit-direction BiDi formatting characters through into sanitized href and src attributes, allowing sanitized...

CVE-2026-45064 Symfony: HtmlSanitizer URL Attributes Pass Through BiDi Override Characters → Visual href Spoofing

Symfony is a PHP framework for web and console applications and a set of reusable PHP components. From 6.1.0-BETA1 until 6.4.40, 7.4.12, and 8.0.12, UrlSanitizer::parse passes Unicode explicit-direction BiDi formatting characters through into sanitized href and src attributes, allowing sanitized...

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

Symfony is a PHP framework for web and console applications and a set of reusable PHP components. From 6.1.0-BETA1 until 6.4.40, 7.4.12, and 8.0.12, UrlAttributeSanitizer::getSupportedAttributes omits URL-valued attributes including action, formaction, poster, and cite, so configurations that adm...

CVE-2026-45066

Symfony is a PHP framework for web and console applications and a set of reusable PHP components. From 6.1.0-BETA1 until 6.4.40, 7.4.12, and 8.0.12, HtmlSanitizer URL sanitization can allow off-allowlist URLs through allowLinkHosts or allowMediaHosts because UrlSanitizer::parse follows RFC 3986...

EUVD-2026-44339

Symfony is a PHP framework for web and console applications and a set of reusable PHP components. From 6.1.0-BETA1 until 6.4.40, 7.4.12, and 8.0.12, HtmlSanitizer URL sanitization can allow off-allowlist URLs through allowLinkHosts or allowMediaHosts because UrlSanitizer::parse follows RFC 3986...

CVE-2026-45066 Symfony: HtmlSanitizer allowLinkHosts() / allowMediaHosts() Bypass via URL-Parser Differentials and <area> Misclassification

Symfony is a PHP framework for web and console applications and a set of reusable PHP components. From 6.1.0-BETA1 until 6.4.40, 7.4.12, and 8.0.12, HtmlSanitizer URL sanitization can allow off-allowlist URLs through allowLinkHosts or allowMediaHosts because UrlSanitizer::parse follows RFC 3986...

CVE-2026-45066 Symfony: HtmlSanitizer allowLinkHosts() / allowMediaHosts() Bypass via URL-Parser Differentials and <area> Misclassification

Symfony is a PHP framework for web and console applications and a set of reusable PHP components. From 6.1.0-BETA1 until 6.4.40, 7.4.12, and 8.0.12, HtmlSanitizer URL sanitization can allow off-allowlist URLs through allowLinkHosts or allowMediaHosts because UrlSanitizer::parse follows RFC 3986...

CVE-2026-45066: Incomplete List of Disallowed Inputs

Symfony is a PHP framework for web and console applications and a set of reusable PHP components. From 6.1.0-BETA1 until 6.4.40, 7.4.12, and 8.0.12, HtmlSanitizer URL sanitization can allow off-allowlist URLs through allowLinkHosts or allowMediaHosts because UrlSanitizer::parse follows RFC 3986...