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Historically, Bootstrap’s JS-based components like Tooltips and Popovers have been targets for XSS if the html option is enabled and the content is not manually sanitized before being passed to the component . Recommended Mitigation
While 5.1.3 remains free of verified direct exploits, the framework has evolved significantly. Maintain a pipeline to periodically update the library to the latest stable release within the major v5 lifecycle. Upgrading patch versions is typically seamless and ensures your site benefits from continuous performance tuning, browser compatibility fixes, and defensive architectural changes.
Reports have highlighted that in some scenarios, data-slide and data-slide-to attributes can be targeted. If user input is directly allowed into these attributes without sanitization, an attacker could inject Javascript into the href attribute of an tag.
' data-bs-content="Hover or click to trigger exploit"> Hover over me Use code with caution. Execution Flow:
Malicious scripts can inject fake login forms over the page to harvest user passwords.
Many entry-level static application security testing (SAST) tools do not actively test for working exploits. Instead, they scan JavaScript files for specific strings or keywords like data-target or innerHTML . When they detect these combinations inside custom code alongside a Bootstrap library, they register a medium-severity warning. How to Verify and Secure Your Bootstrap Implementations
Older iterations of Bootstrap allowed configuration parameters to be passed via HTML data attributes (e.g., data-template , data-content , or data-title ). If an application accepted user-controlled input and rendered it directly into these attributes without sanitization, an attacker could execute arbitrary JavaScript.
As of April 2026, Bootstrap 5.1.3 has no widely documented "direct" exploits
Historically, Bootstrap’s JS-based components like Tooltips and Popovers have been targets for XSS if the html option is enabled and the content is not manually sanitized before being passed to the component . Recommended Mitigation
While 5.1.3 remains free of verified direct exploits, the framework has evolved significantly. Maintain a pipeline to periodically update the library to the latest stable release within the major v5 lifecycle. Upgrading patch versions is typically seamless and ensures your site benefits from continuous performance tuning, browser compatibility fixes, and defensive architectural changes.
Reports have highlighted that in some scenarios, data-slide and data-slide-to attributes can be targeted. If user input is directly allowed into these attributes without sanitization, an attacker could inject Javascript into the href attribute of an tag.
' data-bs-content="Hover or click to trigger exploit"> Hover over me Use code with caution. Execution Flow:
Malicious scripts can inject fake login forms over the page to harvest user passwords.
Many entry-level static application security testing (SAST) tools do not actively test for working exploits. Instead, they scan JavaScript files for specific strings or keywords like data-target or innerHTML . When they detect these combinations inside custom code alongside a Bootstrap library, they register a medium-severity warning. How to Verify and Secure Your Bootstrap Implementations
Older iterations of Bootstrap allowed configuration parameters to be passed via HTML data attributes (e.g., data-template , data-content , or data-title ). If an application accepted user-controlled input and rendered it directly into these attributes without sanitization, an attacker could execute arbitrary JavaScript.
As of April 2026, Bootstrap 5.1.3 has no widely documented "direct" exploits
