Original WordPress theme: Unauthenticated PHP Object Injection
Summary
The Original WordPress theme by axiomthemes, in versions up to and including 1.9.0, is vulnerable to PHP Object Injection through deserialization of untrusted input. An unauthenticated attacker can send crafted data to the website and potentially execute harmful code on the server. Whether the flaw leads to code execution depends on other plugins or themes installed on the site that could form a usable gadget chain.
Affected
- Original theme for WordPress, versions <= 1.9.0
Fixed in
- Unknown. No vendor patch or fixed version has been published according to the sources reviewed.
Workaround
- No vendor-issued workaround known.
- Deactivate and remove the theme if it is not actively used.
- Audit other installed plugins and themes for deserialization issues.
- Restrict access to the website where possible.
- A web application firewall may reduce exposure, but no vendor-validated rule is known.
Exploitation
- CISA SSVC (Vulnrichment): Exploitation none, Automatable yes, Technical Impact total.
- Not known to be exploited in the wild and not listed in CISA KEV.
- Public proof-of-concept exploit: not confirmed.
Our recommendation
- Identify all websites running Original <= 1.9.0.
- Remove or disable the theme where possible.
- Check regularly for a vendor patch and apply it as soon as it is available.
- Review co-installed plugins and themes that could form a usable chain.
- Monitor the website for suspicious activity and consider a web application firewall as an interim measure.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Patchstack advisory patchstack.com
- Wordfence/WPScan advisory wpscan.com
- OpenCVE CVE-2026-66568 app.opencve.io
- HOL Guard CVE-2026-66568 hol.org
- Strix CVE-2026-66568 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, 19:24.
Original description (NVD)
Unauthenticated PHP Object Injection in Original <= 1.9.0 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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