click5 CRM add-on to WPForms: Unauthenticated arbitrary options update
Summary
The click5 CRM add-on for the WPForms WordPress plugin (up to and including 1.0.3) exposes a REST endpoint that updates WordPress options without authorisation or CSRF checks and does not restrict updates to the add-on's own settings. An unauthenticated remote attacker can change arbitrary blog options, for example to create a new administrator account and take over the website. The NVD score is 9.8 (critical); no vendor fix is available and the plugin appears to be unmaintained.
Affected
- click5 CRM add-on to WPForms (plugin slug wpf-add-on-by-click5), versions up to and including 1.0.3
- Unknown whether other versions are affected
Fixed in
Unknown. No fixed version is known; WPScan lists the plugin with "No known fix".
Workaround
- Deactivate and remove the add-on if it is not business-critical
- Restricting access to the REST API at web-server or WAF level is only a stopgap; no vendor-validated guidance exists
Exploitation
- Attack requires no authentication and no user interaction, over the network
- CISA SSVC: automatable yes, technical impact total
- No public exploit confirmed; VulDB states no exploit exists; EPSS about 0.1%
- Not listed in CISA KEV; no evidence of exploitation in the wild found
Our recommendation
- Inventory all WordPress sites for the wpf-add-on-by-click5 plugin and check for it in WPForms-related plugin lists
- Remove or disable the add-on where possible, as no patch is expected
- Audit administrator accounts and recent option changes for signs of compromise
- Watch for vendor or WPScan updates and review related CVE-2026-84259 (XSS in the same plugin family)
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- WPScan vulnerability entry wpscan.com
- OpenCVE CVE-2026-84252 app.opencve.io
- GitHub Advisory GHSA-ghx5-hm5v-jfch github.com
- VulDB vulnerability 416522 vuldb.com
- NVD record via Vulners vulners.com
- Plugin page fair.pm wpf-add-on-by-click5 fair.pm
- WPScan entry CVE-2026-84259 wpscan.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, 19:18.
Original description (NVD)
The click5 CRM add-on to WPForms WordPress plugin through 1.0.3 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 WPForms WordPress plugin through 1.0.3. 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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