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CVE-2026-26861: Insecure Postmessage Origin Validationcve-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

JSCVE-2026-26861CWE-346CWE-79
by Provallyupdated 2026-06-12Apache-2.0
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