CVE-2026-26861: Insecure Postmessage Origin Validation
Validating postMessage origins using string search methods like `includes`, `indexOf`, `startsWith`, or `endsWith` is insecure and prone to bypasses. For example, `origin.includes('trusted.com')` allows bypasses from origins like `https://trusted.com.attacker.com`. Attackers can use this to send malicious messages resulting in Cross-Site Scripting (XSS) or d
JSgreprules fetch cve-2026-26861-insecure-postmessage-origin-validation --engine opengrepDescription
Validating postMessage origins using string search methods like `includes`, `indexOf`, `startsWith`, or `endsWith` is insecure and prone to bypasses. For example, `origin.includes('trusted.com')` allows bypasses from origins like `https://trusted.com.attacker.com`. Attackers can use this to send malicious messages resulting in Cross-Site Scripting (XSS) or d
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