CVE-2026-40804: aBlocks reflected cross-site scripting (XSS) vulnerability
high 7.1 published 2026-10-08
- Affected versions
- 2.16.0 and older
- Fixed in
- 2.17.0 *
- Latest version
- 2.18.0
- Severity
- High · CVSS 7.1
- Active installs
- 2,000+
- Type
- Reflected cross-site scripting (XSS)
* The source does not name a fixed version; this is the first wordpress.org release after the last affected version.
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 Patchstack): CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
What to do now
- Update aBlocks to 2.17.0 or newer (the latest is 2.18.0): 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 aBlocks issue.
With WP-CLI:
wp plugin get ablocks --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
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Kodezen LLC aBlocks ablocks allows Reflected XSS.This issue affects aBlocks: from n/a through 2.16.0.
References
- NVD CVE-2026-40804 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.
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/ablocks (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.