Newsletter Subscription Form WordPress plugin: Unauthenticated SQL injection
Summary
The WordPress plugin Newsletter Subscription Form – User Subscriptions Form, Capture Email up to and including version 1.5.9 contains an SQL injection flaw (CWE-89). An unauthenticated remote attacker can inject SQL commands via the public subscription form, which may allow reading, modifying or deleting database content such as subscriber data and user account information. The CVSS score is 9.3 (Critical), and no login is required.
Affected
- Newsletter Subscription Form – User Subscriptions Form, Capture Email WordPress plugin, all versions up to and including 1.5.9
Fixed in
- Unknown. No vendor fix or fixed version has been confirmed at the time of writing.
Workaround
- Deactivate and remove the plugin if the newsletter form is not required.
- Place the site behind a WAF or virtual patch; Patchstack reports a mitigation rule, but this has not been verified independently.
- Restrict the database account used by WordPress to the minimum required privileges.
- Check the database and web server logs for signs of abuse.
Exploitation
- Not known to be exploited; not listed in CISA KEV.
- CISA SSVC: exploitation none, automatable yes, technical impact partial.
- No public proof of concept found.
Our recommendation
- Identify all WordPress sites that run this plugin, including client sites.
- Deactivate and remove the plugin where it is not needed.
- If it must stay, apply a WAF or virtual patch and restrict database privileges until an official fix is available.
- Check logs and the database for signs of compromise.
- Monitor the Patchstack and WordPress.org pages for a fixed release and update immediately once one is published.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Patchstack advisory patchstack.com
- Strix CVE record www.strix.ai
- HOL CVE record hol.org
- Radar OffSeq radar.offseq.com
- WordPress.org plugin page en-gb.wordpress.org
- WordPress.org author page Weblizar wordpress.org
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, 03:18.
Original description (NVD)
Unauthenticated SQL Injection in Newsletter Subscription Form – User Subscriptions Form, Capture Email <= 1.5.9 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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