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Blog2Social CVE-2026-89031

| EUVDEUVD-2026-80775 MEDIUM
Authorization Bypass Through User-Controlled Key (CWE-639)
2026-09-16 VulnCheck GHSA-f53j-3ghj-6c45
5.3
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
5.3 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
5.4 MEDIUM

Remote authenticated low-privilege edit_posts user (PR:L) tampers with others' scheduled posts (I:L), suppression harms availability of that content (A:L), no data read (C:N).

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

2
Analysis Generated
Sep 16, 2026 - 14:46 vuln.today
CVE Published
Sep 16, 2026 - 14:03 cve.org
MEDIUM 5.3

DescriptionCVE.org

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.

AnalysisAI

Broken access control in the Adenion Blog2Social plugin for WordPress before 9.1.0 lets any authenticated user holding the edit_posts capability (Contributor role or higher) reschedule, suppress, or otherwise alter the scheduled social-media post records belonging to other users. The issue is remotely reachable over HTTP with no user interaction, but exploitation is gated by low-privilege authentication and by the presence of other users' scheduled posts, so cross-user impact is negligible on single-author sites. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Delivery
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Exploit
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Execution
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Impact
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Vulnerability AssessmentAI

Exploitation Requires an authenticated WordPress account holding the edit_posts capability (Contributor role or higher) on a site running Blog2Social before 9.1.0 - so the site must allow multiple/low-trust registered authors for cross-user impact to be meaningful. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment This is a genuine but moderate-severity issue, correctly rated CVSS 4.0 5.3 (Medium). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Vendor-released patch: upgrade Blog2Social to version 9.1.0 or later, which adds the missing ownership constraint to the b2s_calendar_move_post handler; update through the WordPress Plugins screen or with `wp plugin update blog2social` and confirm the installed version afterwards. … Detailed patch versions, workarounds, and compensating controls in full report.

Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-89031 vulnerability details – vuln.today

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