Vulnerability library
Security checkJune 02, 2026

Bootstrap Vulnerable to Cross-Site Scripting

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Medium severitynpmbootstrap-sass

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Description

Versions of bootstrap prior to 3.4.1 for 3.x and 4.3.1 for 4.x are vulnerable to Cross-Site Scripting (XSS). The data-template attribute of the tooltip and popover plugins lacks input sanitization and may allow attacker to execute arbitrary JavaScript.

Recommendation

Update the bootstrap-sass package to the latest compatible version. Followings are version details:

  • Affected version(s): >= 3.0.0, < 3.4.1
  • Patched version(s): 3.4.1

References

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Related Issues

See something that needs correcting? Let us knowUpdated June 02, 2026