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CVE-2018-1999024

20
FAUCET Score

CVE-2018-1999024 describes a Cross-Site Scripting (XSS) vulnerability in MathJax versions prior to 2.7.4, specifically within the \unicode{} macro. This medium-severity flaw (CVSS 5.4) allows untrusted JavaScript to execute in a user's browser if they view a page processing malicious content via MathJax. While no active exploitation, public exploit code, or significant community discussion has been observed, the vulnerability is easily exploitable with low attack complexity, requiring user interaction. The issue was patched in MathJax version 2.7.4.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.7.4CPE matchmatch criteria
cpe:2.3:a:mathjax:mathjax:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

5.4MEDIUM

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
2.5
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.25%
Probability of exploitation in next 30 days
EPSS Percentile
66.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0125 is in the 79th percentile among its peer group of 26,209 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (5)

github_advisorypatch availablevia nvd_reference
View patch
microsoftpatch availablevia msrc
Product: 16959-17084Fixed in: 1.26.3-4
microsoftpatch availablevia msrc
Product: 16959-16817Fixed in: 1.26.3-4
microsoftpatch availablevia msrc
Product: azl3 numpy 1.26.3-4 on Azure Linux 3.0Fixed in: 1.26.3-4
npmpatch availablevia ghsa
Product: mathjaxFixed in: 2.7.4

Vendor Advisories (2)

npmGHSA-3c48-6pcv-88rmmedium

Macro in MathJax running untrusted Javascript within a web browser

Jul 27, 2018
microsoft2018-Jul/CVE-2018-1999024Moderate

MathJax version prior to version 2.7.4 contains a Cross Site Scripting (XSS) vulnerability

Jul 10, 2018

References

blog.bentkowski.info / 2018/06/xss-in-google-colaboratory-csp-bypass.html
ExploitThird Party Advisory
github.com / mathjax/MathJax/commit/a55da396c18cafb767a26aa9ad96f6f4199852f1
PatchThird Party Advisory