CVE-2026-89030 Blog2Social WordPress Plugin < 9.1.0 User Email Disclosure via b2s_search_user
Low-privileged users can retrieve email addresses of all registered WordPress users, including administrators, due to missing authorization checks 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-2026-89030?
CVE-2026-89030 is a medium-severity missing authorization 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 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.
Weakness: CWE-862
Which versions are affected by CVE-2026-89030?
How do I fix CVE-2026-89030?
No fix has been published for CVE-2026-89030 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-89030 being exploited?
There is no known exploitation of CVE-2026-89030 in the wild and no public exploit code.
Sources
Also known as GHSA-78j3-qgmg-rvq3.