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MEDIUM severity

Macro in MathJax running untrusted Javascript within a web browserGHSA-3c48-6pcv-88rm

MEDIUMFix: mathjax/MathJax@a55da39

GHSA-3c48-6pcv-88rm is a medium-severity (CVSS 5.4) Cross-site Scripting (XSS) vulnerability in mathjax. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for mathjax — see the affected versions and patch details below.

Also known asCVE-2018-1999024
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Nov 4, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.4%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs73th percentile — riskier than 73% of all scored CVEsHighest risk
0.00%0.65%1.30%1.95%0.2%1.4%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.

160other npm packages depend on this — each one inherits the vulnerability until it's patched upstream
mathjaxnpm
291Kdownloads / week

Description

MathJax version prior to version 2.7.4 contains a Cross Site Scripting (XSS) vulnerability in the \unicode{} macro that can result in Potentially untrusted Javascript running within a web browser. This attack appear to be exploitable via The victim must view a page where untrusted content is processed using Mathjax. This vulnerability appears to have been fixed in 2.7.4 and later.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npmmathjaxall versions2.7.4npm install mathjax@2.7.4

Affected Products

1 product · 1 configurations
Application
mathjaxmathjax
< 2.7.4
range
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

MathJax version prior to version 2.7.4 contains a Cross Site Scripting (…

blog.bentkowski.infoNVDSep 2018

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Fix

    Update mathjax to 2.7.4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-3c48-6pcv-88rm is resolved across your whole dependency graph.

  3. Workarounds

    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

MathJax version prior to version 2.7.4 contains a Cross Site Scripting (XSS) vulnerability in the `\unicode{}` macro that can result in Potentially untrusted Javascript running within a web browser. This attack appear to be exploitable via The victim must view a page where untrusted content is processed using Mathjax. This vulnerability appears to have been fixed in 2.7.4 and later.
O3 Security · Impact-Aware SCA

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Macro in MathJax running untrusted Javascript within a…