WhatsUp Gold versions prior to 26.0.2 contain an arbitrary file write vulnerability in the LogToFile action handler.

published 2026-08-12 2 mo ago modified 2026-10-24 15 d ago also EUVD-2026-57264

cvss: 6.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 32%
public exploits: 0; none known

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.

Patch / fix

fixed in 1

Progress Software Corporation WhatsUp Gold 26.0.2

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 2 mo ago (2026-08-12)

Exploit prediction

0.38% chance of exploitation in the next 30 days, higher than 32% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	6.8	CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Affected products

Progress Software Corporation WhatsUp Gold

Classification

Weakness

CWE-434 Unrestricted Upload of File with Dangerous Type
CWE-73 External Control of File Name or Path
CWE-22 Improper Limitation of a Pathname to a Restricted Directory

References

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

Sources

CVE List CVE-2026-65939
NVD CVE-2026-65939

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary