CVE-2026-115299: Contact Form by Supsystic cross-site request forgery (CSRF) vulnerability
medium 5.4 published 2026-10-29
- Affected versions
- older than 1.11.1
- Fixed in
- 1.11.1
- Latest version
- 1.11.2
- Severity
- Medium · CVSS 5.4
- Active installs
- 6,000+
- Type
- Cross-site request forgery (CSRF)
What an attacker needs
- Access: None. No account or login is needed (per the CVSS score).
- Interaction: It also needs someone on the site (often an admin) to click a link, open a page or submit a form the attacker prepared.
CVSS vector (score by CISA ADP): CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
What to do now
- Update Contact Form by Supsystic to 1.11.1 or newer (the latest is 1.11.2): Dashboard → Updates, or Plugins → “update now”.
- If you cannot update right away, deactivate it until you can.
- Turn on auto-updates for it: Plugins → “Enable auto-updates” on its row.
- Not sure which version you run? Check your version against every known Contact Form by Supsystic issue.
With WP-CLI:
wp plugin get contact-form-by-supsystic --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
The Contact Form by Supsystic WordPress plugin before 1.11.1 does not verify a CSRF nonce before saving its mail settings, allowing an attacker to overwrite the site's outbound mail configuration, including the SMTP server, its credentials and the notification recipient, by tricking a logged-in administrator into visiting a crafted page, which can route the Contact Form by Supsystic WordPress plugin before 1.11.1's contact-form notifications through infrastructure the attacker controls.
References
- NVD CVE-2026-115299 nvd.nist.gov
- WPScan advisory wpscan.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.
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/contact-form-by-supsystic (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.