CVE-2025-1647: XSS in Bootstrap title attribute for Tooltip and Popover

Severity: medium (CVSS 5.6 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-05-15 · updated 2026-10-09
Weakness: CWE-79

Description

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Bootstrap allows Cross-Site Scripting (XSS).This issue affects Bootstrap: from 3.4.1 before 4.0.0.

Affected products

Bootstrap: from 3.4.1 before 4.0.0 — fixed in 4.0.0

How to fix

Upgrade to a fixed version: Bootstrap 4.0.0. Check the vendor advisory for mitigations.

References

https://www.herodevs.com/vulnerability-directory/cve-2025-1647
https://lists.debian.org/debian-lts-announce/2025/06/msg00001.html
https://lists.debian.org/debian-lts-announce/2026/10/msg00023.html

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