# Bootstrap vulnerable to Cross-Site Scripting (XSS)

Advisory record · `GHSA-3wqf-4x89-9g79`

- **Identifiers:** `GHSA-3wqf-4x89-9g79` · `CVE-2018-14040` · `PKSA-br4g-j817-6t7w`
- **State:** Confirmed
- **Severity:** CVSS 6.1 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-79](https://cwe.mitre.org/data/definitions/79.html)
- **Tags:** [Cross-site scripting (XSS)](https://agentprime.io/advisories/tag/xss.md)
- **Published:** 13 May 2022
- **Updated:** 10 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 13 May 2022, 01:07 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `bootstrap` (npm): affected `>=4.0.0, <4.1.2 || >=2.3.0, <3.4.0`; fixed in `4.1.2`, `3.4.0`
- `bootstrap` (RubyGems): affected `>=4.0.0, <4.1.2 || >=2.3.0, <3.4.0`; fixed in `4.1.2`, `3.4.0`
- `org.webjars:bootstrap` (Maven): affected `>=4.0.0, <4.1.2 || >=2.3.0, <3.4.0`; fixed in `4.1.2`, `3.4.0`
- `bootstrap` (NuGet): affected `>=2.3.0, <3.4.0 || >=4.0.0, <4.1.2`; fixed in `3.4.0`, `4.1.2`
- `bootstrap.sass` (NuGet): affected `>=4.0.0, <4.1.2`; fixed in `4.1.2`
- `bootstrap-sass` (RubyGems): affected `>=2.3.0, <3.4.0`; fixed in `3.4.0`
- `twbs/bootstrap` (Packagist): affected `>=2.3.0, <3.4.0 || >=4.0.0, <4.1.2`; fixed in `3.4.0`, `4.1.2`

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 6.1 Medium, CVSS 3.0: `CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`, from GitHub Advisory Database

- **CISA KEV:** Not listed.
- **EPSS:** 0.041, the 90th percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the GitHub Advisory Database, published 13 May 2022. New records show when each source confirmed them.

## Sources

- [GitHub Advisory Database: GHSA-3wqf-4x89-9g79](https://github.com/advisories/GHSA-3wqf-4x89-9g79)
- [OSV: GHSA-3wqf-4x89-9g79](https://osv.dev/vulnerability/GHSA-3wqf-4x89-9g79)
- <https://nvd.nist.gov/vuln/detail/CVE-2018-14040>
- <https://github.com/twbs/bootstrap/issues/26423>
- <https://github.com/twbs/bootstrap/issues/26625>
- <https://github.com/twbs/bootstrap/pull/26630>
- <https://github.com/twbs/bootstrap-rubygem/commit/f34c43c936ac7d0ebb129289321d8c51cd56aed1#diff-4e736e880b7fc39eb5e85576b629f6e3cd08f02f45104a7b4581f82852e97a81R1306>
- <https://github.com/twbs/bootstrap/commit/149096016f70fd815540d62c0989fd99cdc809e0>
- <https://github.com/twbs/bootstrap/commit/2a5ba23ce8f041f3548317acc992ed8a736b609d>
- <https://www.tenable.com/security/tns-2021-14>
- <https://www.oracle.com/security-alerts/cpuApr2021.html>
- <https://seclists.org/bugtraq/2019/May/18>
- <https://lists.debian.org/debian-lts-announce/2018/08/msg00027.html>
- <https://lists.apache.org/thread.html/rd0e44e8ef71eeaaa3cf3d1b8b41eb25894372e2995ec908ce7624d26@%3Ccommits.pulsar.apache.org%3E>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-3wqf-4x89-9g79>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-3wqf-4x89-9g79/>. Everything for agents: <https://agentprime.io/llms.txt>.