CVE-2018-1999024: MathJax version prior to version 2.7.4 contains a Cross Site Scripting (XSS) vulnerability in the \unicode{} m

Q: How do I fix CVE-2018-1999024?

mathjax: upgrade to 2.7.4. Exact commands for each OS are on this page.

Q: Is CVE-2018-1999024 being exploited?

CVE-2018-1999024 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2018-1999024 affect?

CVE-2018-1999024 affects mathjax. Severity is medium (CVSS 5.4). 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 Th

Q: How urgent is CVE-2018-1999024?

Priority 42/100. Public exploit reference

This month

MEDIUM 5.4UPGRADE

CVE-2018-1999024 is a medium-severity flaw (CVSS 5.4) affecting mathjax. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.4% (top 27%)
CISA exploited list	No
Weakness	CWE-79
Published	2018-07-23
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: mathjax

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2018-07-23 16:29 UTCPublished CVE record published
2026-06-17 01:48 UTCUpdated Record last modified

mathjax mathjax UPGRADE

Affected: < 2.7.4

Fixed in: 2.7.4

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy mathjax || rpm -q mathjax || mathjax --version

2. UPGRADE to 2.7.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade mathjax

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mathjax

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2018-1999024?

mathjax: upgrade to 2.7.4. Exact commands for each OS are on this page.

Is CVE-2018-1999024 being exploited?

CVE-2018-1999024 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2018-1999024 affect?

CVE-2018-1999024 affects mathjax. Severity is medium (CVSS 5.4). 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 Th

How urgent is CVE-2018-1999024?

Priority 42/100. Public exploit reference

References

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