CVE-2026-89031 Blog2Social WordPress Plugin < 9.1.0 Broken Access Control via b2s_calendar_move_post
Low-privileged users can modify other users' scheduled social media posts due to missing ownership checks in the Blog2Social WordPress 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-2026-89031?
CVE-2026-89031 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 allows low-privileged users to modify the scheduled post records of other users. The b2s_calendar_move_post AJAX handler in includes/Ajax/Post.php issues an UPDATE against the b2s_posts table using only the attacker-supplied b2s_id primary key with no blog_user_id ownership constraint, allowing any user with the edit_posts capability to reschedule, suppress, or alter the publication state of any other user's scheduled social media post.
Weakness: CWE-639
Which versions are affected by CVE-2026-89031?
How do I fix CVE-2026-89031?
No fix has been published for CVE-2026-89031 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-2026-89031 being exploited?
There is no known exploitation of CVE-2026-89031 in the wild and no public exploit code.
Sources
Also known as GHSA-f53j-3ghj-6c45.