CVE-2026-89029 Blog2Social WordPress Plugin < 9.1.0 User Enumeration via AJAX Handler
Low-privileged users can enumerate WordPress user accounts and map IDs to display names via an insecure AJAX handler in the Blog2Social plugin.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-89029?
CVE-2026-89029 is a medium-severity vulnerability in Adenion Blog2Social, published on 16 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-639
Which versions are affected by CVE-2026-89029?
How do I fix CVE-2026-89029?
No fix has been published for CVE-2026-89029 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-89029 being exploited?
There is no known exploitation of CVE-2026-89029 in the wild and no public exploit code.
Sources
Also known as GHSA-6r37-32vj-mjwv.