WpCues Basic Quiz: Unauthenticated SQL injection via quiz result submission
Summary
The WpCues Basic Quiz WordPress plugin up to and including version 1.6.5 does not properly sanitise and escape values used in SQL statements. An unauthenticated attacker who can reach the website can send a crafted request during quiz result submission and read data from the WordPress database, such as user data and credentials. The CVSS score is 8.6 (high), but no fixed version is known.
Affected
- WpCues Basic Quiz WordPress plugin, versions 0 up to and including 1.6.5
- Plugin slug: wpcues-basic-quiz
Fixed in
Unknown. No fixed version is known; WPScan lists the status as "No known fix".
Workaround
- No vendor mitigation is known.
- Deactivate and remove the plugin if the quiz function is not required.
- If the plugin must stay, block or restrict the quiz submission endpoint and place a web application firewall or virtual patch in front of the site.
Exploitation
- No known exploitation in the wild. CISA SSVC: exploitation none, automatable yes. Not listed in KEV according to Strix.
- Public proof of concept: unclear.
Our recommendation
- Identify all WordPress sites running WpCues Basic Quiz 1.6.5 or earlier.
- Deactivate and remove the plugin on public-facing sites, or shield it with a WAF or virtual patch.
- Check the WordPress database for signs of unexpected access.
- Re-enable only after a vendor fix or a WPScan/Patchstack update is confirmed.
- Monitor the NVD and WPScan entries for a patch or proof of concept.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- WPScan vulnerability record wpscan.com
- OpenCVE CVE-2026-89214 app.opencve.io
- Vulners VulnRichment CVE-2026-89214 vulners.com
- Patchstack advisory via Vulners vulners.com
- NVD record via Vulners vulners.com
- Strix CVE-2026-89214 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 1 Nov 2026, 09:01.
Original description (NVD)
The WpCues Basic Quiz WordPress plugin through 1.6.5 does not properly sanitise and escape values before using them in a SQL statement, which allows unauthenticated attackers to perform SQL injection attacks and read data from the database.
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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