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CriticalVulnerabilityCVE-2026-112862updated 25 Oct 2026, 17:05 UTC

Participants Database WordPress plugin can be abused to inject malicious objects

Attackers may be able to send specially crafted data to this WordPress plugin and make it run harmful code on your website. This could let them take control of the site.

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 crafted serialized data
  2. 2Public requestReaches the WordPress site
  3. 3PluginDeserializes untrusted input
  4. 4WebsiteMalicious object runs code
  5. ResultAttacker may control the website

What happened

The participants-database plugin by xnau webdesign deserializes untrusted data, allowing PHP object injection. The affected range is all versions through 2.7.8.5.

Why it is dangerous: A successful attack could lead to full compromise of the website, including stolen data or planted malware. Any WordPress site running this plugin is at risk.

Are you affected?

You are affected if you run the Participants Database plugin (participants-database) version 2.7.8.5 or earlier on your WordPress site.

Participants Database (participants-database) WordPress plugin: all versions through 2.7.8.5

What to do

  1. Check whether the participants-database plugin is installed and what version it is
  2. Update the plugin to a version newer than 2.7.8.5 as soon as one is available
  3. If no fixed version exists yet, deactivate the plugin until a fix is released

Timeline

  1. 23 Oct 2026, 09:17 UTC
    Publicly disclosed
  2. 23 Oct 2026, 09:17 UTC
    Reported by NVD · NVD
  3. 25 Oct 2026, 17:05 UTC
    GitHub Advisory reported on it · GitHub Advisory

Sources 2 reports, oldest first

Official vendor, government CERT or advisory database

Technical details

ID
CVE-2026-112862 · GHSA-j354-jq2c-82gj
CVSS
9.8 / 10
EPSS
0.4% chance of exploitation within 30 days
Disclosed
23 Oct 2026, 09:17 UTC
On Zero Radar
before the radar started
Last change
25 Oct 2026, 17:05 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

Participants Database WordPress plugin can be abused to inject malicious objects · Zero Radar