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CVE-2018-20676

MEDIUM

CVE-2018-20676 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in org.webjars:bootstrap. O3 Security confirms whether CVE-2018-20676 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.

XSS vulnerability that affects bootstrap

Also known asGHSA-3mgp-fx93-9xv5
Published
Jan 9, 2019
Updated
Jul 8, 2026
Affected
7 pkgs
Patched
7 / 7
Exploits
None indexed

Blast Radius

7 pkgs affected
org.webjars:bootstrap📦bootstrap📦bootstrap-sass.NETbootstrap🐘twbs/bootstrap💎bootstrap💎bootstrap-sass

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven, npm packages — download data is not available via public APIs for these ecosystems.

Description

In Bootstrap before 3.4.0, XSS is possible in the tooltip data-viewport attribute.

Affected Packages

7 total 7 fixed
EcosystemPackageVulnerable rangeFix
Mavenorg.webjars:bootstrapall versions3.4.0
📦npmbootstrapall versions3.4.0
📦npmbootstrap-sassall versions3.4.0
.NETNuGetbootstrapall versions3.4.0
🐘Packagisttwbs/bootstrapall versions3.4.0
💎RubyGemsbootstrapall versions3.4.0

Detection & mitigation playbook

Open-source dependency
  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.webjars:bootstrap. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.

  2. Fix

    Update org.webjars:bootstrap to 3.4.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2018-20676 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

  4. How O3 protects you

    O3 pinpoints whether CVE-2018-20676 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Tailored to CVE-2018-20676. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

In Bootstrap before 3.4.0, XSS is possible in the tooltip data-viewport attribute.
O3 Security · Impact-Aware SCA

Is CVE-2018-20676 in your dependencies?

O3 detects CVE-2018-20676 across Maven, npm, NuGet dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.