Auth bypass in Advanced Twenty Seventeen
CVE-2026-107887
The Advanced Twenty Seventeen WordPress plugin through 1.3.1 does not perform any capability or nonce check on the action that creates and activates its bundled child , allowing any authenticated user such as a subscriber to switch the site's active site-wide, and allowing the same action to be triggered against any logged-in user including an administrator via CSRF.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Advanced Twenty Seventeen
Weakness classification (CWE)
References
- wpscan.com/vulnerability/e252c7ee-368d-4bfb-a964-06804747c162/ (technical-description, exploit, vdb-entry)
Frequently asked questions
- What is CVE-2026-107887?
- CVE-2026-107887 is a medium-severity vulnerability in Advanced Twenty Seventeen, classified under Missing Authorization. CVSS score: 5.4/10. Published 2026-10-24.
- How severe is CVE-2026-107887?
- Medium severity. CVSS v3 base score is 5.4 out of 10.