Published: April 17, 2026
If you're maintaining a legacy project still running alpha.6, treat it as a critical security debt that needs immediate remediation. Modern browsers, security standards, and attack techniques have evolved significantly since 2017 — don't let your front-end security remain in the past. Have questions about migrating from Bootstrap alpha versions? Drop a comment below or reach out on Twitter @yourhandle. Stay secure! bootstrap v4.0.0-alpha.6 vulnerabilities
The tooltip and popover plugins in Bootstrap versions prior to 3.4.1 and 4.3.x before 4.3.1 contained an XSS vulnerability. While alpha.6 predates these fixes, the vulnerable code pattern exists in this alpha release. Attackers could inject malicious JavaScript through custom data-* attributes when the tooltip or popover was initialized with unsanitized user input. Published: April 17, 2026 If you're maintaining a