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...

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...

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

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...

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...

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...

GHSA-X5QJ-865H-MGVM Symfony: HtmlSanitizer UrlAttributeSanitizer Misses URL Attributes

Description Symfony\Component\HtmlSanitizer\Visitor\AttributeSanitizer\UrlAttributeSanitizer::getSupportedAttributes enumerates the attribute names whose values are scrubbed through UrlSanitizer::sanitize scheme and host allow-lists, javascript: rejection, BiDi check, etc.. The list is 'src',...

HTMLSanitizer 跨站脚本漏洞

HTMLSanitizer is an HTML formatting software open source by JuliaHub. Versions of HTMLSanitizer prior to 2.3.2 had a cross-site scripting vulnerability. This vulnerability occurred when ALLOWINSECURERAWTEXT was enabled, resulting in blank variant closing tags being ignored, which could lead to...

Symfony and Symfony HTML Sanitizer Component 6.1.x < 6.4.40 / 7.0.x < 7.4.12 / 8.0.x 8.0.12 Multiple Vulnerabilities

The version of Symfony and/or the Symfony HTML Sanitizer Component installed on the remote host is prior to 6.1.x prior to 6.4.40, 7.0.x prior to 7.4.12, 8.0.x prior to 8.0.12. and, therefore, affected by multiple vulnerabilities: - A visual spoofing vulnerability exists in Symfony Component...

GHSA-H5VQ-QFCG-4M6P Symfony's HtmlSanitizer URL Attributes Pass Through BiDi Override Characters → Visual href Spoofing

Description Symfony\Component\HtmlSanitizer\TextSanitizer\UrlSanitizer::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 ...

Symfony's HtmlSanitizer URL Attributes Pass Through BiDi Override Characters → Visual href Spoofing

Description Symfony\Component\HtmlSanitizer\TextSanitizer\UrlSanitizer::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 ...