Auth bypass in Adenion Blog2social
CVE-2026-89030
Adenion Blog2Social plugin for WordPress before 9.1.0 exposes the email addresses of all registered WordPress users to low-privileged accounts. The b2s_search_user AJAX handler in includes/Ajax/Get.php invokes B2S_Tools::searchUser() in includes/Tools.php, which returns the email address of every matching user without restricting access to callers holding the list_users capability, allowing any user with the edit_posts capability to retrieve user email addresses including those of administrators.
Vulnerability class: Broken Access Control
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
Weakness classification (CWE)
References
- disclosure@vulncheck.com (release-notes, patch)
- disclosure@vulncheck.com (third-party-advisory)
Frequently asked questions
- What is CVE-2026-89030?
- CVE-2026-89030 is a medium-severity vulnerability in Adenion Blog2social, classified under Missing Authorization. CVSS score: 4.3/10. Published 2026-09-16.
- How severe is CVE-2026-89030?
- Medium severity. CVSS v3 base score is 4.3 out of 10.