A vulnerability has been identified in Bootstrap that exposes users to Cross-Site Scripting (XSS) attacks. The issue is present in the carousel component, where the data-slide and data-slide-to attributes can be exploited through the href attribute of an <a> tag due to inadequate sanitization. This vulnerability could potentially enable attackers to execute arbitrary JavaScript within the victim's browser.

Arbitrary code execution (via backdoor code) was discovered in bootstrap-sass 3.2.0.3, when downloaded from rubygems.org. An unauthenticated attacker can craft the cfduid cookie value with base64 arbitrary code to be executed via eval(), which can be leveraged to execute arbitrary code on the target system. Note that there are three underscore characters in the cookie name. This is unrelated to the cfduid cookie that is legitimately used by Cloudflare.

A cross-site scripting vulnerability was discovered in bootstrap. If an attacker could control the data given to tooltip or popover, they could inject HTML or Javascript into the rendered page when tooltip or popover events fired.

A flaw was found in Bootstrap before 3.4.0. XSS is possible in the tooltip data-viewport attribute.

References: https://blog.getbootstrap.com/2018/12/13/bootstrap-3-4-0/ https://github.com/twbs/bootstrap/issues/27044 https://github.com/twbs/bootstrap/issues/27915#issuecomment-452140906 https://github.com/twbs/bootstrap/issues/27915#issuecomment-452196628

Upstream Patch: https://github.com/twbs/bootstrap/pull/27047

A flaw was found in Bootstrap before 3.4.0. XSS is possible in the affix configuration target property.

References: https://blog.getbootstrap.com/2018/12/13/bootstrap-3-4-0/ https://github.com/twbs/bootstrap/issues/27045 https://github.com/twbs/bootstrap/issues/27915#issuecomment-452140906 https://github.com/twbs/bootstrap/issues/27915#issuecomment-452196628

Upstream Patch: https://github.com/twbs/bootstrap/pull/27047

A flaw was found in Bootstrap from version 4.0 and before 4.1.2. A Cross-site Scripting (XSS) is possible in the data-container property of tooltip.

References: https://github.com/twbs/bootstrap/issues/26628

Upstream Patch: https://github.com/twbs/bootstrap/pull/26630

A flaw was found in Bootstrap from version 4.0 and before 4.1.2. A Cross-site Scripting (XSS) is possible in the collapse data-parent attribute.

References: https://github.com/twbs/bootstrap/issues/26625

Upstream Patch: https://github.com/twbs/bootstrap/pull/26630

A flaw was found in Bootstrap from version 4.0 and before 4.1.2. A Cross-site Scripting (XSS) is possible in the data-target property of scrollspy.

References: https://github.com/twbs/bootstrap/issues/26627

Upstream Patch: https://github.com/twbs/bootstrap/pull/26630

Bootstrap is vulnerable to cross-site scripting, caused by improper validation of user-supplied input by the data-target attribute. A remote attacker could exploit this vulnerability to execute script in a victim's Web browser within the security context of the hosting Web site. An attacker could use this vulnerability to steal the victim's cookie-based authentication credentials.