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Not in CISA KEV
MEDIUM severity

CVE-2025-1647 — bootstrap

MEDIUM

CVE-2025-1647 is a medium-severity (CVSS 5.6) Cross-site Scripting (XSS) vulnerability in bootstrap. The records list no fixed version yet; check the vendor advisory below and apply the mitigations in the meantime.

Bootstrap Vulnerable to Cross-Site Scripting in its Popover and Tooltip Components

Also known asGHSA-q58r-hwc8-rm9j
Published
Updated
Affected
1 pkg
Patched
None yet
Exploits
None indexed
Exploitation data as of Nov 3, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

Proof-of-concept exploit code exists

  • CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.

Exploitation and automatability from CISA’s SSVC triage for CVE-2025-1647.

EPSS Exploitation Probability

via FIRST.org ↗
0.4%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs38th percentile — riskier than 38% of all scored CVEsHighest risk
0.00%0.31%0.62%0.93%0.3%0.4%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

15Kother npm packages depend on this — each one inherits the vulnerability until it's patched upstream
bootstrapnpm
8.3Mdownloads / week

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 version 3.4.1. At time of publication, there is no publicly available patched version.

Affected Packages

1 total
EcosystemPackageVulnerable rangeFix
📦npmbootstrapall versionsNo fix

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for bootstrap, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Remediation status

    The records we use list no patched version of bootstrap for CVE-2025-1647. Check the maintainer's advisory, and where your build allows, override or pin the dependency away from the vulnerable range.

  3. Mitigate without a patch

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

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 version 3.4.1. At time of publication, there is no publicly available patched version.
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CVE-2025-1647: bootstrap XSS (Medium 5.6)