CVE-2026-7051: Blog2Social WordPress Auth Bypass Flaw

CVE-2026-7051 Overview

CVE-2026-7051 is a missing authorization vulnerability in the Blog2Social: Social Media Auto Post & Scheduler plugin for WordPress. The flaw affects all plugin versions up to and including 8.9.0. Authenticated attackers with low privileges can soft-delete other users' published and scheduled social media post records. The vulnerability stems from missing ownership verification in the B2S_Post_Tools::deleteUserPublishPost() and B2S_Post_Tools::deleteUserSchedPost() functions. Both functions omit a blog_user_id constraint in their database queries. Attackers can supply arbitrary sequential wp_b2s_posts.id values via the postId parameter to disrupt content publishing workflows on affected WordPress sites.

Critical Impact

Authenticated attackers can soft-delete any user's Blog2Social published or scheduled post records, disrupting social media publishing workflows across affected WordPress installations.

Affected Products

• Blog2Social: Social Media Auto Post & Scheduler plugin for WordPress, all versions up to and including 8.9.0
• WordPress installations using the affected Blog2Social plugin versions
• Vulnerable functions: B2S_Post_Tools::deleteUserPublishPost() and B2S_Post_Tools::deleteUserSchedPost()

Discovery Timeline

• 2026-05-13 - CVE CVE-2026-7051 published to NVD
• 2026-05-13 - Last updated in NVD database

Technical Details for CVE-2026-7051

Vulnerability Analysis

The vulnerability is classified as Missing Authorization [CWE-862]. The Blog2Social plugin exposes two AJAX-accessible handlers that allow users to delete their own published or scheduled social media post records. These handlers invoke B2S_Post_Tools::deleteUserPublishPost() and B2S_Post_Tools::deleteUserSchedPost() in includes/B2S/Post/Tools.php. The functions accept a postId value supplied by the client and perform a soft delete against the wp_b2s_posts table.

Neither function validates that the post identified by postId belongs to the requesting user. The resulting SQL operation filters only by the row's primary key, not by the owning blog_user_id. Any authenticated user, including subscribers, can iterate sequential identifiers and delete records owned by other accounts.

Root Cause

The root cause is the absence of an ownership constraint in the database query executed by the soft-delete logic. Both vulnerable functions trust the caller's postId input without correlating it to the current WordPress user ID. The database operation should include a WHERE blog_user_id = <current_user> predicate but does not. This pattern violates the principle that authorization checks must accompany every privileged data operation, not only the entry-point capability check.

Attack Vector

Exploitation requires only an authenticated session on the target WordPress site. The attacker sends an AJAX request to the Blog2Social endpoint with a chosen postId value referencing a record owned by another user. Because the request is network-accessible and complexity is low, an attacker can script enumeration of sequential wp_b2s_posts.id values to mass-delete records. The impact is limited to integrity and availability of Blog2Social post records, as confidentiality is not affected. Refer to the Wordfence Vulnerability Report and the WordPress Blog2Social Tools source for technical details. No verified proof-of-concept code is published; the vulnerability mechanism is described in prose only.

Detection Methods for CVE-2026-7051

Indicators of Compromise

• Unexpected disappearance of scheduled or published Blog2Social post entries from a user's dashboard.
• Web server access logs containing repeated POST requests to admin-ajax.php with Blog2Social actions and sequentially incrementing postId parameter values.
• Database rows in wp_b2s_posts flipped to a deleted/hidden state without corresponding administrative action by the owning user.

Detection Strategies

• Monitor admin-ajax.php requests targeting Blog2Social delete actions and correlate the requesting user ID with the blog_user_id of the referenced post.
• Alert on a single authenticated session issuing multiple delete requests against postId values that span multiple owners within a short window.
• Audit the wp_b2s_posts table for soft-delete state changes initiated by non-owning users.

Monitoring Recommendations

• Enable WordPress audit logging for plugin AJAX actions and retain logs for forensic review.
• Review low-privilege accounts (subscriber, contributor) for unusual activity against plugin endpoints.
• Track plugin version inventory across all WordPress sites and flag instances still running Blog2Social 8.9.0 or earlier.

How to Mitigate CVE-2026-7051

Immediate Actions Required

• Update the Blog2Social plugin to a version newer than 8.9.0 that includes the ownership check fix referenced in the WordPress Blog2Social Changeset.
• Review existing wp_b2s_posts records and restore any soft-deleted entries that do not correspond to legitimate user activity.
• Audit all WordPress user accounts and remove or downgrade unused authenticated accounts.

Patch Information

The vendor addressed the issue in a release subsequent to 8.9.0. The fix introduces a blog_user_id constraint in the database queries inside B2S_Post_Tools::deleteUserPublishPost() and B2S_Post_Tools::deleteUserSchedPost() so that only records owned by the requesting user can be soft-deleted. See the WordPress Blog2Social Tools source for the current implementation.

Workarounds

• Restrict the Blog2Social plugin to trusted administrative users where feasible by limiting plugin capabilities through a role management plugin.
• Place a Web Application Firewall (WAF) rule in front of admin-ajax.php to block low-privilege users from invoking Blog2Social delete actions until the patch is applied.
• Disable or deactivate the Blog2Social plugin on sites where social media publishing automation is not actively required.

# Configuration example: WP-CLI plugin update
wp plugin update blog2social
wp plugin get blog2social --field=version