Auth bypass in Adenion Blog2social
CVE-2026-89031
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.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L.
EPSS exploit prediction
EPSS: 0.003 (22.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 23rd percentile — 22.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
Weakness classification (CWE)
References
- wordpress.org/plugins/blog2social/ (release-notes, patch)
- www.vulncheck.com/advisories/blog2social-wordpress-plugin-broken-access-control… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-89031?
- CVE-2026-89031 is a medium-severity vulnerability in Adenion Blog2social, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 5.4/10. Published 2026-09-16.
- How severe is CVE-2026-89031?
- Medium severity. CVSS v3 base score is 5.4 out of 10.