click5 CRM add-on to Contact Form 7: Unauthenticated stored XSS
Summary
The click5 CRM add-on for the Contact Form 7 WordPress plugin does not sanitise and escape content submitted through an unauthenticated endpoint before displaying it on an admin page. An unauthenticated attacker can submit a malicious script that is stored and executed in the browser of a logged-in administrator or other privileged user who views the affected page. This can lead to session hijacking or actions performed in the name of the administrator, which could allow a full site takeover. Exploitation requires a privileged user to view the page.
Affected
- click5 CRM add-on to Contact Form 7 (WordPress plugin slug cf7-add-on-by-click5), all versions through 1.0.4
- Vendor: Unknown
Fixed in
- Unknown. No fixed version is known; the plugin appears to be no longer maintained.
Workaround
- None documented by the sources.
Exploitation
- No known exploitation in the wild. Not listed in the KEV catalogue.
- CISA SSVC: exploitation none, automatable no, technical impact total.
- No public proof of concept confirmed.
Our recommendation
- Check whether the plugin is installed on any public WordPress site.
- Deactivate and remove the plugin, as no fix exists.
- If removal is not possible, restrict access to the WordPress admin area and do not open CRM or form-submission pages from untrusted sources.
- Review Contact Form 7 submissions for suspicious script content.
- Check for signs of compromise such as new admin accounts, changed options or injected scripts.
- Note that the sister flaw CVE-2026-84254 (CVSS 9.8) in the same plugin allows unauthenticated changes to site options, which makes removal more urgent.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- WPScan vulnerability CVE-2026-84261 wpscan.com
- WPScan plugin page cf7-add-on-by-click5 wpscan.com
- GitHub advisory GHSA-3w72-95j2-ph87 github.com
- OpenCVE CVE-2026-84261 app.opencve.io
- WPScan vulnerability CVE-2026-84254 (sister flaw) 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 31 Oct 2026, 20:43.
Original description (NVD)
The click5 CRM add-on to Contact Form 7 WordPress plugin through 1.0.4 does not sanitise and escape content submitted through an unauthenticated endpoint before outputting it back in an admin page, leading to Stored XSS which could be used against high privilege users such as admin.
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.
Affected? We can help.
We check whether your systems are affected, install updates and close the gap – continuously with the System Health Checker if you wish.