Auth bypass in Adenion Blog2social
CVE-2026-89029
Adenion Blog2Social plugin for WordPress before 9.1.0 allows low-privileged users to enumerate WordPress user accounts. The b2s_get_select_mandant_user AJAX handler in includes/Ajax/Get.php resolves arbitrary user IDs supplied in the owner parameter to display names without verifying that the caller is authorized to read user account data, allowing any user with the edit_posts capability to map WordPress user IDs to display names and confirm account existence for arbitrary IDs.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.003 (20.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 20.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
Weakness classification (CWE)
References
- wordpress.org/plugins/blog2social/ (release-notes, patch)
- www.vulncheck.com/advisories/blog2social-wordpress-plugin-user-enumeration-via-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-89029?
- CVE-2026-89029 is a medium-severity vulnerability in Adenion Blog2social, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.3/10. Published 2026-09-16.
- How severe is CVE-2026-89029?
- Medium severity. CVSS v3 base score is 4.3 out of 10.