CVE-2026-95606: The Events Calendar PHP object injection vulnerability
critical 9.8 published 2026-10-07 · updated 2026-10-08
- Affected versions
- 6.17.4 and older
- Fixed in
- 6.17.4.1
- Latest version
- 6.18.3
- Severity
- Critical · CVSS 9.8
- Active installs
- 600,000+
- Type
- PHP object injection
What an attacker needs
- Access: None. No account or login is needed (per the CVSS score).
CVSS vector (score by Patchstack): CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
What to do now
- Update The Events Calendar to 6.17.4.1 or newer (the latest is 6.18.3): Dashboard → Updates, or Plugins → “update now”.
- If you cannot update right away, deactivate it until you can.
- Turn on auto-updates for it: Plugins → “Enable auto-updates” on its row.
- Not sure which version you run? Check your version against every known The Events Calendar issue.
With WP-CLI:
wp plugin get the-events-calendar --field=version. - If you ran an affected version and something looks off (new admin users, spam pages, redirects), run the free scan below.
The advisory
Deserialization of Untrusted Data vulnerability in Liquid Web / StellarWP The Events Calendar allows Object Injection. This issue affects The Events Calendar: from n/a through 6.17.4.
References
- NVD CVE-2026-95606 nvd.nist.gov
- Patchstack advisory patchstack.com
Related
Ran an affected version? Check your site for signs of a hack
The free scan reads the public side of your site and looks for spam pages, hidden redirects, injected scripts and blacklist entries. No login, no install, about a minute.
Where this data comes from
- CVE record, score and references: NIST National Vulnerability Database (NVD), checked 2026-11-04. This product uses data from the NVD API but is not endorsed or certified by the NVD.
- Versions and install counts: wordpress.org/plugins/the-events-calendar (Plugins API), fetched 2026-11-01.
- The summary, “what an attacker needs” and “what to do” sections are our plain-English reading of the record and the plugin's release history; the quoted description is the record's own text. Spot an error? Email Daniel.