Medium
Angular: Template and Attribute Namespace Sanitization Bypass (XSS)
Type: advisorySources: OSV
Angular is a development platform for building mobile and desktop web applications using TypeScript/JavaScript and other languages. Prior to 22.0.0-rc.2, 21.2.15, 20.3.22 and 19.2.22, an issue in the @angular/compiler and @angular/core packages allows bypassing element and attribute sanitization/validation through specific namespace workarounds. Specifically, namespaced script elements (e.g., or <:svg:script>) were not properly identified as script elements by the Angular template preparser, allowing them to pass through template compilation without being stripped. Furthermore, security context schema mappings for element attributes did not consistently handle attributes within namespaced elements (like SVG and MathML), opening up gaps where malicious namespaced attributes could bypass runtime and compile-time sanitizers. Combined, these flaws enable an attacker who can inject or supply a template/tag structure with custom namespaces to bypass Angular's script-stripping logic and attribute sanitizers, leading to client-side Cross-Site Scripting (XSS). This vulnerability is fixed in 22.0.0-rc.2, 21.2.15, 20.3.22 and 19.2.22.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-50557
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 11:05 UTC · Revision 1
Source evidence
Angular: Template and Attribute Namespace Sanitization Bypass (XSS)
core-osv · Original sourcePublished 22 Jun 2026, 15:11 UTC
Angular is a development platform for building mobile and desktop web applications using TypeScript/JavaScript and other languages. Prior to 22.0.0-rc.2, 21.2.15, 20.3.22 and 19.2.22, an issue in the @angular/compiler and @angular/core packages allows bypassing element and attribute sanitization/validation through specific namespace workarounds. Specifically, namespaced script elements (e.g., or <:svg:script>) were not properly identified as script elements by the Angular template preparser, allowing them to pass through template compilation without being stripped. Furthermore, security context schema mappings for element attributes did not consistently handle attributes within namespaced elements (like SVG and MathML), opening up gaps where malicious namespaced attributes could bypass runtime and compile-time sanitizers. Combined, these flaws enable an attacker who can inject or supply a template/tag structure with custom namespaces to bypass Angular's script-stripping logic and attribute sanitizers, leading to client-side Cross-Site Scripting (XSS). This vulnerability is fixed in 22.0.0-rc.2, 21.2.15, 20.3.22 and 19.2.22.
osv:CVE-2026-50557
Complete source record
{
"id": "fdf065922cef07ad0a68b845c091f333631bba2fad70910216af00f6b176cce5",
"url": "https://osv.dev/vulnerability/CVE-2026-50557",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Angular: Template and Attribute Namespace Sanitization Bypass (XSS)",
"summary": "Angular is a development platform for building mobile and desktop web applications using TypeScript/JavaScript and other languages. Prior to 22.0.0-rc.2, 21.2.15, 20.3.22 and 19.2.22, an issue in the @angular/compiler and @angular/core packages allows bypassing element and attribute sanitization/validation through specific namespace workarounds. Specifically, namespaced script elements (e.g., or <:svg:script>) were not properly identified as script elements by the Angular template preparser, allowing them to pass through template compilation without being stripped. Furthermore, security context schema mappings for element attributes did not consistently handle attributes within namespaced elements (like SVG and MathML), opening up gaps where malicious namespaced attributes could bypass runtime and compile-time sanitizers. Combined, these flaws enable an attacker who can inject or supply a template/tag structure with custom namespaces to bypass Angular's script-stripping logic and attribute sanitizers, leading to client-side Cross-Site Scripting (XSS). This vulnerability is fixed in 22.0.0-rc.2, 21.2.15, 20.3.22 and 19.2.22.",
"evidence": "osv:CVE-2026-50557",
"products": [],
"severity": "medium",
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"id": "CVE-2026-50557",
"aliases": [
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"GHSA-f3m7-gqxr-g87x"
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"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-50557.json"
}
}
],
"modified": "2026-10-28T02:30:34.515785018Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/50xxx/CVE-2026-50557.json",
"https://github.com/angular/angular/security/advisories/GHSA-f3m7-gqxr-g87x",
"https://nvd.nist.gov/vuln/detail/CVE-2026-50557",
"https://github.com/angular/angular/pull/68689",
"https://github.com/angular/angular/pull/68868"
],
"provider_metadata": {
"cwe_ids": [
"CWE-79"
],
"cna_assigner": "GitHub_M",
"unresolved_ranges": [
{
"extracted_events": [
{
"range": [
{
"introduced": ">= 21.0.0-next.0 < 21.2.15"
},
{
"last_affected": ">= 21.0.0-next.0 < 21.2.15"
},
{
"introduced": ">= 22.0.0-next.0 < 22.0.0-rc.2"
},
{
"last_affected": ">= 22.0.0-next.0 < 22.0.0-rc.2"
},
{
"introduced": ">= 20.0.0-next.0 < 20.3.22"
},
{
"last_affected": ">= 20.0.0-next.0 < 20.3.22"
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{
"introduced": ">= 19.0.0-next.0 < 19.2.22"
},
{
"last_affected": ">= 19.0.0-next.0 < 19.2.22"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandaloneSingleVersion"
}
]
}
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/50xxx/CVE-2026-50557.json"
}
},
"related_cves": [
{
"value": "CVE-2026-50557",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 501937,
"published_at": "2026-06-22T15:11:48.347+00:00"
}