click5 CRM add-on for Contact Form 7: Unauthenticated arbitrary option update
Summary
The click5 CRM add-on for Contact Form 7, a WordPress plugin, lacks authorisation and CSRF checks on a REST endpoint that updates WordPress options. An unauthenticated attacker over the network can change arbitrary blog options, for example to create a new administrator account and take over the site. The CVSS score is 9.8 (critical), and no fixed version is known.
Affected
- click5 CRM add-on to Contact Form 7 (WordPress plugin, slug cf7-add-on-by-click5), versions up to and including 1.0.4
Fixed in
- Unknown. No fixed version is known; the plugin is shown as closed on WordPress.org.
Workaround
- Deactivate and remove the add-on if it is not required.
- If the add-on must remain, restrict its REST routes at the web application firewall or reverse proxy (test on a staging copy first; the exact endpoint name is unconfirmed).
Exploitation
- CISA KEV: not listed.
- EPSS: about 0.11%.
- CISA SSVC: exploitation none, automatable yes, technical impact total.
- Public proof of concept: unclear; no public exploit was verified.
Our recommendation
- Check whether the add-on is installed on any WordPress site and remove it, since no patch is known.
- Audit WordPress administrator accounts and recently changed options now, as the flaw may already have been abused.
- Review web server and WAF logs for requests to the add-on's REST routes.
- Restrict access to WordPress admin and REST endpoints where possible and keep backups available for restoration.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- WPScan vulnerability record wpscan.com
- WPScan plugin page cf7-add-on-by-click5 wpscan.com
- OpenCVE CVE-2026-84254 app.opencve.io
- VulDB CVE-2026-84254 vuldb.com
- Strix CVE-2026-84254 www.strix.ai
- Vulners NVD CVE-2026-84254 vulners.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, 19:15.
Original description (NVD)
The click5 CRM add-on to Contact Form 7 WordPress plugin through 1.0.4 does not have authorisation and CSRF checks when updating options via a REST endpoint, and does not ensure that the option to be updated belongs to the click5 CRM add-on to Contact Form 7 WordPress plugin through 1.0.4. As a result, unauthenticated attackers could change arbitrary blog options, allowing them to create a new administrator account and take over the site.
NVD references (1)
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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