Skip to content
Patch Next
Sign inAdd to your agent

← Actionable
Medium, CVSS 6.1amended

Bootstrap vulnerable to Cross-Site Scripting (XSS)

CVE-2018-14040GHSA-3wqf-4x89-9g79

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (bootstrap.sass 4.1.2; org.webjars:bootstrap 4.1.2, 3.4.0; bootstrap-sass 3.4.0; bootstrap 4.1.2, 3.4.0; bootstrap 4.1.2, 3.4.0; 2 more packages under Affected packages), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

Add to your agent

Affected packages

  • NuGet bootstrap.sass

    Affected
    >= 4.0.0, < 4.1.2
    Fixed in
    4.1.2

  • Maven org.webjars:bootstrap

    Affected
    >= 4.0.0, < 4.1.2>= 2.3.0, < 3.4.0
    Fixed in
    3.4.0, 4.1.2

  • RubyGems bootstrap-sass

    Affected
    >= 2.3.0, < 3.4.0
    Fixed in
    3.4.0

  • npm bootstrap

    Affected
    >= 4.0.0, < 4.1.2>= 2.3.0, < 3.4.0
    Fixed in
    3.4.0, 4.1.2

  • NuGet bootstrap

    Affected
    >= 2.3.0, < 3.4.0>= 4.0.0, < 4.1.2
    Fixed in
    3.4.0, 4.1.2

  • Packagist twbs/bootstrap

    Affected
    >= 2.3.0, < 3.4.0>= 4.0.0, < 4.1.2
    Fixed in
    3.4.0, 4.1.2

  • RubyGems bootstrap

    Affected
    >= 4.0.0, < 4.1.2>= 2.3.0, < 3.4.0
    Fixed in
    3.4.0, 4.1.2

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
6.1 · CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS
  • CVE-2018-14040: 4.13% estimated exploitation activity in the next 30 days; percentile 90.85 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

In Bootstrap starting in version 2.3.0 and prior to 3.4.0, as well as 4.x before 4.1.2, XSS is possible in the collapse data-parent attribute.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from ghsa record GHSA-3wqf-4x89-9g79

  2. Revision 1 · created ·

    Published from osv record GHSA-3wqf-4x89-9g79

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2018-14040

Advisory: Bootstrap vulnerable to Cross-Site Scripting (XSS)
IDs: CVE-2018-14040, GHSA-3wqf-4x89-9g79
Record: https://patchnext.com/advisories/cve-2018-14040 (revision 2, source checked 26 Oct 2026, 12:31 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: bootstrap.sass 4.1.2; org.webjars:bootstrap 4.1.2, 3.4.0; bootstrap-sass 3.4.0; bootstrap 4.1.2, 3.4.0; bootstrap 4.1.2, 3.4.0; twbs/bootstrap 4.1.2, 3.4.0; bootstrap 4.1.2, 3.4.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- NuGet bootstrap.sass: affected >= 4.0.0, < 4.1.2; fixed in 4.1.2
- Maven org.webjars:bootstrap: affected >= 4.0.0, < 4.1.2; >= 2.3.0, < 3.4.0; fixed in 3.4.0, 4.1.2
- RubyGems bootstrap-sass: affected >= 2.3.0, < 3.4.0; fixed in 3.4.0
- npm bootstrap: affected >= 4.0.0, < 4.1.2; >= 2.3.0, < 3.4.0; fixed in 3.4.0, 4.1.2
- NuGet bootstrap: affected >= 2.3.0, < 3.4.0; >= 4.0.0, < 4.1.2; fixed in 3.4.0, 4.1.2
- Packagist twbs/bootstrap: affected >= 2.3.0, < 3.4.0; >= 4.0.0, < 4.1.2; fixed in 3.4.0, 4.1.2
- RubyGems bootstrap: affected >= 4.0.0, < 4.1.2; >= 2.3.0, < 3.4.0; fixed in 3.4.0, 4.1.2

## Suggested inspection (read-only)
- NuGet bootstrap.sass: check the installed version with your package manager.
- Maven org.webjars:bootstrap: check the installed version with your package manager.
- RubyGems bootstrap-sass: check the installed version with your package manager.
- `npm ls bootstrap --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.
- NuGet bootstrap: check the installed version with your package manager.
- Packagist twbs/bootstrap: check the installed version with your package manager.
- RubyGems bootstrap: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on bootstrap.sass, org.webjars:bootstrap, bootstrap-sass, bootstrap, twbs/bootstrap.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-3wqf-4x89-9g79 (OSV record GHSA-3wqf-4x89-9g79 lists affected ranges: npm bootstrap >=4.0.0 =2.3.0 =4.0.0 =2.3.0 =4.0.0 =2.3.0 =2.3.0 =4.0.0 =4.0.0 =2.3.0 =2.3.0 =4.0.0 <4.1.2 (fixed))
- Verified: https://github.com/advisories/GHSA-3wqf-4x89-9g79 (GitHub-reviewed advisory GHSA-3wqf-4x89-9g79 lists affected ranges: npm bootstrap >=4.0.0 =2.3.0 =4.0.0 =2.3.0 =4.0.0 =2.3.0 =2.3.0 =4.0.0 =4.0.0 =2.3.0 =2.3.0 =4.0.0 <4.1.2)

Commands are suggestions: review each one before running it.

Loading voting…