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.

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)

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.

Affected products

Adenion Blog2social

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

disclosure@vulncheck.com (release-notes, patch)
disclosure@vulncheck.com (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.