CVE-2026-41555: Newsletter Subscription Form SQL injection vulnerability
critical 9.3 affects latest 1.5.9 published 2026-10-06
- Affected versions
- 1.5.9 and older
- Fixed in
- no fix yet
- Latest version
- 1.5.9
- Severity
- Critical · CVSS 9.3
- Active installs
- 1,000+
- Type
- SQL injection
What an attacker needs
- Access: None. No account or login is needed (per the CVSS score).
CVSS vector (score by Patchstack): CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:L
What to do now
- There is no fixed version yet. If you can manage without Newsletter Subscription Form for now, deactivate and delete it until the developer ships a fix.
- If you must keep it, cut down who can log in (remove unused accounts, especially low-level ones, and turn off open registration) and put a web application firewall in front of the site.
- Check the Newsletter Subscription Form page for a fix; it updates when the CVE feeds do.
- Not sure which version you run? Check your version against every known Newsletter Subscription Form issue.
With WP-CLI:
wp plugin get newsletter-subscription-form --field=version. - If you ran an affected version and something looks off (new admin users, spam pages, redirects), run the free scan below.
The advisory
Unauthenticated SQL Injection in Newsletter Subscription Form – User Subscriptions Form, Capture Email <= 1.5.9 versions.
References
- NVD CVE-2026-41555 nvd.nist.gov
- Patchstack advisory patchstack.com
Related
Ran an affected version? Check your site for signs of a hack
The free scan reads the public side of your site and looks for spam pages, hidden redirects, injected scripts and blacklist entries. No login, no install, about a minute.
Already hacked? Flat $499 cleanup with a 30-day reinfection guarantee.
Where this data comes from
- CVE record, score and references: NIST National Vulnerability Database (NVD), checked 2026-11-04. This product uses data from the NVD API but is not endorsed or certified by the NVD.
- Versions and install counts: wordpress.org/plugins/newsletter-subscription-form (Plugins API), fetched 2026-11-04.
- The summary, “what an attacker needs” and “what to do” sections are our plain-English reading of the record and the plugin's release history; the quoted description is the record's own text. Spot an error? Email Daniel.