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CriticalVulnerabilityCVE-2026-108983updated 25 Oct 2026, 15:20 UTC

GeoWebServer default connection ports flaw allows critical compromise

A web server program called GeoWebServer can be attacked over the network because of a flaw in how it handles its default connection ports. Attackers may be able to take control of affected systems.

Official, 2 sources
SeverityCriticalCVSS 9.8 of 10
Being exploited?UnclearNo reports either way yet
Fix available?UnclearNo fixed version published in the sources yet
How sure is this?Official, 2 sourcesBacked by an official source

What happened

A vulnerability exists in the default connection port handling of GeoWebServer.exe, a web server process. The advisory material does not describe the exact weakness type.

Why it is dangerous: Because the flaw is rated critical (CVSS 9.8) and can apparently be reached over the network, a compromise could give attackers significant access to the server and any data on it.

Are you affected?

You are affected if you run GeoWebServer.exe with its default connection ports exposed to a network.

GeoWebServer (GeoWebServer.exe), affected versions not specified in the provided material

What to do

  1. Check whether GeoWebServer.exe is installed and running on your systems
  2. Restrict network access to its default ports using a firewall until a fix is confirmed
  3. Check the GitHub Advisory GHSA-4688-jpp9-vr89 and the vendor for patched versions and apply them as soon as available

Timeline

  1. 19 Oct 2026, 02:17 UTC
    Publicly disclosed
  2. 19 Oct 2026, 02:17 UTC
    Reported by NVD · NVD
  3. 25 Oct 2026, 15:20 UTC
    GitHub Advisory reported on it · GitHub Advisory

Sources 2 reports, oldest first

Official vendor, government CERT or advisory database

Technical details

ID
CVE-2026-108983 · GHSA-4688-jpp9-vr89
CVSS
9.8 / 10
EPSS
0.4% chance of exploitation within 30 days
Disclosed
19 Oct 2026, 02:17 UTC
On Zero Radar
before the radar started
Last change
25 Oct 2026, 15:20 UTC

The plain-language parts and the attack diagram were written by an AI model (anthropic/claude-haiku-5.5) from the sources above. Facts like versions, exploitation and dates come from the sources themselves. How Zero Radar works

GeoWebServer default connection ports flaw allows critical compromise · Zero Radar