ThemeREX Education Center: Unauthenticated PHP Object Injection
Summary
The WordPress theme Education Center up to and including version 3.6.12 contains an unauthenticated PHP Object Injection flaw (CWE-502). An attacker can send crafted serialized data to the site without logging in, which may allow manipulation of server-side processing and, depending on other installed components, code execution or data compromise. Any site with the theme active and reachable from the internet is exposed.
Affected
- Education Center WordPress theme, all versions up to and including 3.6.12
- Lower bound not stated by the sources
Fixed in
- Unknown. No confirmed fixed version. Version 3.6.13 is listed by the vendor, but no source states that it fixes CVE-2026-66483.
Workaround
- No vendor-published workaround found.
- Deactivate or remove the theme where it is not in active use.
- Deploy WAF or reverse proxy rules that block serialized PHP object payloads on WordPress endpoints.
- Review web server and PHP logs for deserialization warnings.
Exploitation
- Not listed in CISA KEV. CISA SSVC: exploitation none, automatable yes, technical impact total.
- EPSS 0.00304 (low).
- No public proof of concept found; this does not prove none exists.
- Patchstack rates the flaw high priority and expects exploitation.
Our recommendation
- Identify all WordPress sites using Education Center, including staging sites, and confirm the version.
- Remove or disable the theme where unused.
- Where used, request a confirmed fixed version from ThemeREX or Patchstack and apply WAF filtering until then.
- Check for signs of compromise such as unexpected admin users, modified files and unusual AJAX requests.
- Replace any unlicensed (nulled) copies with a licensed version.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Patchstack advisory patchstack.com
- OpenCVE CVE-2026-66483 app.opencve.io
- VulDB CVE-2026-66483 vuldb.com
- ThemeREX Education Center product page themerex.net
- ThemeForest Education Center listing themeforest.net
- Strix CVE-2026-66483 www.strix.ai
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 30 Oct 2026, 19:27.
Original description (NVD)
Unauthenticated PHP Object Injection in Education Center <= 3.6.12 versions.
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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