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Blog2Social EUVDEUVD-2026-80772

| CVE-2026-89030 MEDIUM
Missing Authorization (CWE-862)
2026-09-16 VulnCheck GHSA-78j3-qgmg-rvq3
PHP WordPress Authentication Bypass Blog2Social Wordpress Plugin Adenion
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:L/VI:N/VA:N/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

Primary rating from Vendor (VulnCheck) · only source for this CVE.

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 - 14:35 vuln.today
CVE Published
Sep 16, 2026 - 14:01 cve.org
MEDIUM 5.3

DescriptionCVE.org

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.

AnalysisAI

User email disclosure in Adenion's Blog2Social WordPress plugin before 9.1.0 allows any authenticated user holding the edit_posts capability to enumerate and retrieve the email addresses of every registered account on the site, including administrators. The b2s_search_user AJAX handler fails to restrict callers to those with the list_users capability, turning a routine user-search function into a bulk contact-harvesting primitive for low-privileged insider or subscriber-level accounts. …

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Vulnerability AssessmentAI

Risk Assessment This is a genuine but modest-severity information-disclosure issue, not a high-impact priority. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Remediation Upgrade Blog2Social to version 9.1.0 or later - the vendor-released patch is available per the WordPress.org plugin developer/changelog page (https://wordpress.org/plugins/blog2social/#developers) and the VulnCheck advisory - and confirm the update has propagated to every site in the estate, including multisite networks where plugin versions can diverge per site. … Detailed patch versions, workarounds, and compensating controls in full report.
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EUVD-2026-80772 vulnerability details – vuln.today
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