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CriticalVulnerabilityCVE-2026-62018updated 29 Oct 2026, 20:34 UTC

Gunslinger plugin: unauthenticated PHP object injection lets anyone run code

Attackers who need no login can send specially crafted data to this software and make it run commands on the server. This could let them take over the website or its data.

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

How the attack works simplified

  1. 1AttackerNeeds no login or account
  2. 2Crafted requestSends malicious serialized data to site
  3. 3GunslingerUnsafely reconstructs the data as objects
  4. 4Code runsInjected objects trigger code on the server
  5. ResultAttacker may control the server

What happened

Unauthenticated PHP Object Injection (unsafe deserialization) in Gunslinger versions 1.11 and earlier.

Why it is dangerous: Successful exploitation could give an attacker full control of the affected server and its data, and any visitor on the internet can attempt it.

Are you affected?

You are affected if you run Gunslinger version 1.11 or earlier.

Gunslinger <= 1.11

What to do

  1. Check whether Gunslinger is installed and confirm its version
  2. Update Gunslinger to a version newer than 1.11 as soon as a fixed release is available
  3. If no fix is available yet, disable or remove Gunslinger until it is patched
  4. Monitor the server for unusual activity while the risk remains

Timeline

  1. 29 Oct 2026, 16:18 UTC
    Publicly disclosed
  2. 29 Oct 2026, 16:18 UTC
    Reported by NVD · NVD
  3. 29 Oct 2026, 16:20 UTC
    Picked up by Zero Radar
  4. 29 Oct 2026, 20:34 UTC
    GitHub Advisory reported on it · GitHub Advisory

Sources 2 reports, oldest first

Official vendor, government CERT or advisory database

Technical details

ID
CVE-2026-62018 · GHSA-v8f6-j65h-jxr8
CVSS
9.8 / 10
EPSS
0.4% chance of exploitation within 30 days
Disclosed
29 Oct 2026, 16:18 UTC
On Zero Radar
29 Oct 2026, 16:20 UTC (2 min after disclosure)
Last change
29 Oct 2026, 20:34 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

Gunslinger plugin: unauthenticated PHP object injection lets anyone run code · Zero Radar