# 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.

- **Severity:** Medium 6.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 29 Jul 2026
- **Updated:** 29 Jul 2026
- **Also known as:** GHSA-fm7p-gw32-828p

## 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 (Improper Encoding or Escaping of Output)

## Which versions are affected by CVE-2026-54705?

2 open source packages ship an affected version, including mathlive.


| Package | Ecosystem | 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.

## Is CVE-2026-54705 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-54705 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-54705 and fix it if it is affected.

What it is: 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.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-54705 exists.

Affected packages and fixed versions:
- mathlive (npm): affected all versions; fixed in 0.110.0
- mathlive (npm): affected all versions; fixed in 0.110.0

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-54705/ (Markdown: https://insights.sbomify.com/CVE-2026-54705/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-54705
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-54705
- OSV: https://osv.dev/vulnerability/CVE-2026-54705

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-54705/
Summaries are generated and may contain mistakes; the official description above is the record.