Content-Security-Policy: default-src 'self'; script-src 'self' https://cdn.jsdelivr.net; style-src 'self' 'unsafe-inline' https://cdn.jsdelivr.net; Avoid using 'unsafe-inline' for scripts if possible; use nonces or hashes instead. Never insert user-generated text directly into data-bs-content or title attributes without using textContent or a sanitization library like DOMPurify.
Not a genuine CVE-class exploit against the framework. It is a developer error. Claim 2: Prototype Pollution via Modal or Dropdown Options Some exploit listings claim that Bootstrap 5.1.3 suffers from prototype pollution when deeply nested configuration objects are merged. This is a sophisticated attack that modifies Object.prototype , potentially leading to RCE in certain JavaScript environments. bootstrap 5.1.3 exploit
var tooltipTriggerList = [].slice.call(document.querySelectorAll('[data-bs-toggle="tooltip"]')) var tooltipList = tooltipTriggerList.map(function (tooltipTriggerEl) { return new bootstrap.Tooltip(tooltipTriggerEl, { sanitize: true, // Default value; explicitly set to be safe allowList: { ...bootstrap.Tooltip.Default.allowList, // Only add trusted tags if absolutely needed } }) }) While 5.1.3 is not inherently vulnerable, later versions (5.2.x, 5.3.x) have introduced stricter defaults for data-bs-html attributes and improved JavaScript validation. Run: It is a developer error
<a data-bs-toggle="modal" data-bs-target="#maliciousModal" href="javascript:alert('XSS')">Click</a> This is not an exploit of the framework; it is a failure to sanitize URLs. Bootstrap does not automatically evaluate javascript: URIs—that behavior depends on the browser and other event handlers. var tooltipTriggerList = []
However, a troubling search query has begun circulating in cybersecurity circles and forums like Exploit-DB, GitHub, and Reddit:
npm update bootstrap Or download the latest from the official CDN. CSP is your strongest defense against XSS. A minimal policy for Bootstrap: