CVE-2026-54705 mathlive's Lack of Escaping of HTML allows for XSS
Attackers can execute arbitrary JavaScript via unescaped LaTeX text commands in MathLive, affecting web applications using this library.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-54705?
CVE-2026-54705 is a medium-severity cross-site scripting vulnerability in arnog mathlive, published on 29 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
MathLive provides web components for math display and input. Prior to 0.110.0, MathLive fails to escape text-mode content in \text{} and \mbox{} commands in Box.toMarkup at src/core/box.ts, in xmlEscape, scanText, and text-mode output in src/formats/atom-to-math-ml.ts, and through convertLatexToMarkup, convertLatexToMathMl, <math-span>, <math-div>, and the default identity MathfieldElement.createHTML, allowing malicious input to run arbitrary JavaScript when rendered. This issue is fixed in version 0.110.0.
Weakness: CWE-116
Which versions are affected by CVE-2026-54705?
2 open source packages ship an affected version, including mathlive.
| Package | Affected | Fixed in |
|---|---|---|
mathlive npm | All versions | 0.110.0 |
mathlive npm | All versions | 0.110.0 |
How do I fix CVE-2026-54705?
Upgrade mathlive to 0.110.0 or later.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-54705 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-54705 exists.
Sources
Also known as GHSA-fm7p-gw32-828p.