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CriticalVulnerabilityCVE-2026-90888updated 30 Oct 2026, 23:26 UTC

LeadSnap plugin lets anyone run code on the site without logging in

A flaw in the LeadSnap plugin lets an outside visitor send specially crafted data that makes the website run commands it should not run. Anyone who can reach the site can try it, with no password needed.

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. 1AttackerSends a crafted request with no login
  2. 2Public sitePlugin accepts the untrusted data
  3. 3Object injectionData is unserialized into PHP objects
  4. 4Code executionAttacker runs commands on the server
  5. ResultAttacker controls the website server

What happened

Unauthenticated PHP Object Injection in LeadSnap versions 1.25 and earlier, where untrusted input is unserialized into PHP objects.

Why it is dangerous: Successful exploitation can let an attacker take over the WordPress site, read or change its data, and install further malware, which puts every site running the plugin at serious risk.

Are you affected?

You are affected if you run the LeadSnap plugin version 1.25 or earlier on your website.

LeadSnap plugin, versions <= 1.25

What to do

  1. Check whether LeadSnap is installed and which version it is on each site
  2. Deactivate and remove LeadSnap 1.25 or earlier if you do not need it
  3. If you must keep it, check the vendor or advisory for a fixed version and update as soon as one is released
  4. Review the site for unexpected admin users, files, or changes

Timeline

  1. 30 Oct 2026, 19:20 UTC
    Publicly disclosed
  2. 30 Oct 2026, 19:20 UTC
    Reported by NVD · NVD
  3. 30 Oct 2026, 19:24 UTC
    Picked up by Zero Radar
  4. 30 Oct 2026, 23:26 UTC
    GitHub Advisory reported on it · GitHub Advisory

Sources 2 reports, oldest first

Official vendor, government CERT or advisory database

Technical details

ID
CVE-2026-90888 · GHSA-27wj-mp2h-85jg
CVSS
9.8 / 10
EPSS
0.3% chance of exploitation within 30 days
Disclosed
30 Oct 2026, 19:20 UTC
On Zero Radar
30 Oct 2026, 19:24 UTC (4 min after disclosure)
Last change
30 Oct 2026, 23:26 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

LeadSnap plugin lets anyone run code on the site without logging in · Zero Radar