CVE-2026-121949 Symfony: HtmlSanitizer Does Not URL-Sanitize srcset and imagesrcset: Media Scheme and Host Allow-List Bypass
| Reporter | Title | Published | Views | Family All 7 |
|---|---|---|---|---|
 | CVE-2026-121949 | 5 Nov 202617:51 | – | circl |
 | CVE-2026-121949 | 5 Nov 202617:46 | – | cve |
 | EUVD-2026-117624 | 5 Nov 202617:46 | – | euvd |
 | CVE-2026-121949 | 5 Nov 202618:17 | – | nvd |
 | PT-2026-137625 | 5 Nov 202600:00 | – | ptsecurity |
 | CVE-2026-121949: sensiolabs symfony: The Symfony HtmlSanitizer component does not apply the media URL policy to the srcset and imagesrcset attributes,… | 5 Nov 202600:00 | – | rapid7 |
 | CVE-2026-121949 | 6 Nov 202606:55 | – | redhatcve |
[
{
"vendor": "sensiolabs",
"product": "symfony",
"collectionURL": "https://packagist.org/packages/symfony/html-sanitizer",
"packageName": "symfony/html-sanitizer",
"repo": "https://github.com/symfony/html-sanitizer",
"modules": [
"Symfony\\Component\\HtmlSanitizer"
],
"versions": [
{
"status": "affected",
"version": "6.1.0",
"lessThan": "6.4.50",
"versionType": "git"
},
{
"status": "affected",
"version": "7.0.0",
"lessThan": "7.4.23",
"versionType": "git"
},
{
"status": "affected",
"version": "8.0.0",
"lessThan": "8.1.11",
"versionType": "git"
}
],
"defaultStatus": "unaffected"
}
]Data
Build on a solid foundation with Vulners data
We provide the essential building blocks for cybersecurity solutions with comprehensive, structured, and constantly updated vulnerability and exploits data
Api
Power your application with Vulners API
The Vulners REST API offers reliable, high-performance access to vulnerability intelligence, with 99.9% SLA uptime and CDN-backed data delivery for seamless global access
App
Assess and manage vulnerabilities with Vulners tools
Built on top of Vulners' database and SDK, end-user solutions give security professionals and developers lightweight and powerful tools for vulnerability remediation
05 Nov 2026 17:46Current
CVSS 42.3
CVSS 3.15.4
SSVC