CVE-2026-111739: All-In-One Security (AIOS) authentication bypass vulnerability
high 7.5 published 2026-10-29
- Affected versions
- older than 5.5.0
- Fixed in
- 5.5.0
- Latest version
- 5.5.1
- Severity
- High · CVSS 7.5
- Active installs
- 1+ million
- Type
- Authentication bypass
What an attacker needs
- Access: A low-level account on the site, such as a subscriber or customer (per the CVSS score).
CVSS vector (score by CISA ADP): CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
What to do now
- Update All-In-One Security (AIOS) to 5.5.0 or newer (the latest is 5.5.1): 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 All-In-One Security (AIOS) issue.
With WP-CLI:
wp plugin get all-in-one-wp-security-and-firewall --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 Two Factor Authentication WordPress plugin before 1.17.0, All-In-One Security (AIOS) WordPress plugin before 5.5.0 do not bind the account whose two-factor code is verified to the account being authenticated, allowing an attacker who knows a victim's password and holds their own two-factor-enabled account to satisfy the victim's second-factor check with their own code and obtain the victim's session.
References
- NVD CVE-2026-111739 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/all-in-one-wp-security-and-firewall (Plugins API), fetched 2026-11-01.
- 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.