RexCoin WordPress theme: Unauthenticated PHP Object Injection
Summary
The RexCoin WordPress theme up to and including version 1.2.6 contains an unauthenticated PHP object injection flaw (CWE-502). A remote attacker can send crafted data to a public website without logging in, which can let them manipulate server-side processing and potentially run harmful code. Patchstack rates the issue as high priority with a CVSS score of 9.8 and expects it to be exploited, while NVD status is currently Deferred.
Affected
- RexCoin WordPress theme versions up to and including 1.2.6
- Only sites that have this theme installed are affected
Fixed in
Unknown. Sources conflict: ThemeForest lists version 1.2.11 (last updated 23 October 2026), but this has not been confirmed to contain the fix. GPL Chimp lists 1.2.6 as the latest version.
Workaround
- Deactivate and remove the theme if it is not needed. This is the only measure that clearly removes the exposure.
- If the theme must stay online, restrict admin access, keep current backups and ask your WAF or managed WordPress provider whether a virtual patch is available. No confirmed virtual patch for this CVE was found.
Exploitation
- No public proof of concept found.
- No in-the-wild exploitation reports found at the time of writing.
- Not verified against the CISA KEV catalogue.
Our recommendation
- Check all WordPress sites for the RexCoin theme and its version.
- If the theme is found on a public site, remove or replace it first, then check whether the vendor has released a fixed version.
- Review web server logs for unusual requests since 13 October 2026.
- Re-check the Patchstack page and NVD for updates.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Patchstack advisory: WordPress RexCoin theme <= 1.2.6 PHP Object Injection patchstack.com
- VulDB entry for CVE-2026-54856 vuldb.com
- Vulners CVE record CVE-2026-54856 vulners.com
- Strix CVE summary CVE-2026-54856 www.strix.ai
- ThemeForest RexCoin listing themeforest.net
- GPL Chimp RexCoin product page gplchimp.com
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, 16:04.
Original description (NVD)
Unauthenticated PHP Object Injection in RexCoin <= 1.2.6 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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