Bootstrap Cross-site Scripting vulnerability

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-2018-14042: 4.01% estimated exploitation activity in the next 30 days; percentile 90.57 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

In Bootstrap starting in version 2.3.0 and prior to versions 3.4.0 and 4.1.2, XSS is possible in the data-container property of tooltip. This is similar to CVE-2018-14041.

Published by the source

13 Sep 2018, 15:50 UTC

Last modified by the source

10 Sep 2026, 03:47 UTC

Source last checked

26 Oct 2026, 12:53 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-7mvr-5x2g-wfc8

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-7mvr-5x2g-wfc8

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# Patch Next advisory brief: CVE-2018-14042

Advisory: Bootstrap Cross-site Scripting vulnerability
IDs: CVE-2018-14042, GHSA-7mvr-5x2g-wfc8
Record: https://patchnext.com/advisories/cve-2018-14042 (revision 2, source checked 26 Oct 2026, 12:53 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-sass 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
- npm bootstrap-sass: affected >= 2.0.4, < 3.4.0; fixed in 3.4.0
- NuGet bootstrap: affected >= 4.0.0, < 4.1.2; >= 2.3.0, < 3.4.0; fixed in 3.4.0, 4.1.2
- Packagist twbs/bootstrap: affected >= 4.0.0, < 4.1.2; >= 2.3.0, < 3.4.0; 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`.
- `npm ls bootstrap-sass --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-7mvr-5x2g-wfc8 (OSV record GHSA-7mvr-5x2g-wfc8 lists affected ranges: RubyGems bootstrap >=4.0.0 =2.3.0 =4.0.0 =2.3.0 =4.0.0 =2.3.0 =4.0.0 =2.3.0 =4.0.0 =2.3.0 =2.3.0 =2.0.4 <3.4.0 (fixed); NuGet…)
- Verified: https://github.com/advisories/GHSA-7mvr-5x2g-wfc8 (GitHub-reviewed advisory GHSA-7mvr-5x2g-wfc8 lists affected ranges: RubyGems bootstrap >=4.0.0 =2.3.0 =4.0.0 =2.3.0 =4.0.0 =2.3.0 =4.0.0 =2.3.0 =4.0.0 =2.3.0 =2.3.0 =2.0.4 =4.0.0 <4.1.2)

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