CVE-2026-57630: Blocksy Companion Pro IDOR Vulnerability

CVE-2026-57630 Overview

CVE-2026-57630 is an unauthenticated Insecure Direct Object Reference (IDOR) vulnerability affecting Blocksy Companion Pro versions <= 2.1.46. The flaw allows remote attackers to access objects belonging to other users without authentication by manipulating identifier parameters in requests. The weakness is classified under CWE-639: Authorization Bypass Through User-Controlled Key. Exploitation requires no privileges and no user interaction, and it results in disclosure of information that should be restricted. The vulnerability was published to the National Vulnerability Database (NVD) on 2026-06-26.

Critical Impact
Unauthenticated remote attackers can access references to other users' objects through the plugin, resulting in unauthorized information disclosure on affected WordPress sites.

Affected Products

Blocksy Companion Pro plugin for WordPress
Versions <= 2.1.46
WordPress sites using the vulnerable plugin release

Discovery Timeline

2026-06-26 - CVE-2026-57630 published to NVD
2026-06-26 - Last updated in NVD database

Technical Details for CVE-2026-57630

Vulnerability Analysis

The vulnerability stems from missing authorization checks on request parameters that reference internal objects. An attacker supplies a crafted identifier and the plugin returns or acts on the referenced object without validating whether the requester is authorized. Because the endpoint is reachable without authentication, exploitation only requires network access to the target WordPress site. The scope is limited to confidentiality: an attacker retrieves information belonging to other users or site contexts, but cannot modify data or disrupt service through this flaw alone. Successful exploitation can chain with other weaknesses to escalate impact, for example when leaked identifiers or metadata support account takeover or targeted follow-on attacks.

Root Cause

The root cause is authorization bypass through a user-controlled key, tracked as CWE-639. The plugin trusts client-supplied object identifiers without verifying that the current session, or lack thereof, is authorized to access the referenced resource. Access control decisions rely on the presence of an identifier rather than on the identity and permissions of the requester.

Attack Vector

The attack vector is network-based over HTTP or HTTPS against the WordPress site hosting Blocksy Companion Pro. An unauthenticated attacker enumerates or guesses object identifiers and issues requests to the vulnerable plugin endpoint. The server responds with data associated with the referenced object, exposing content that should require authorization. Refer to the Patchstack Vulnerability Report for endpoint-specific details.

No verified public exploit code is available at this time. The vulnerability mechanism is described in prose because no proof-of-concept has been released.

Detection Methods for CVE-2026-57630

Indicators of Compromise

Unauthenticated HTTP requests to Blocksy Companion Pro endpoints containing sequential or enumerated numeric identifier parameters.
Elevated request volume from a single source targeting plugin endpoints that accept object IDs.
Access log entries showing successful 200 OK responses to unauthenticated requests referencing user-scoped objects.

Detection Strategies

Review WordPress and web server access logs for repeated requests to Blocksy Companion Pro routes with incrementing ID parameters.
Deploy a Web Application Firewall (WAF) rule to flag unauthenticated access attempts to plugin endpoints that reference internal objects.
Correlate anomalous plugin traffic with the installed plugin version to identify sites running 2.1.46 or earlier.

Monitoring Recommendations

Track plugin inventory across WordPress installations and alert on any host still running Blocksy Companion Pro <= 2.1.46.
Enable verbose logging on the WordPress REST API and admin-ajax endpoints used by the plugin.
Baseline normal request patterns to plugin endpoints and alert on identifier enumeration behavior.

How to Mitigate CVE-2026-57630

Immediate Actions Required

Update Blocksy Companion Pro to a release later than 2.1.46 as soon as the vendor-patched version is available.
Audit WordPress sites to identify installations running affected versions of the plugin.
Restrict access to WordPress administrative and plugin endpoints from untrusted networks where feasible.

Patch Information

Upgrade Blocksy Companion Pro to a version above 2.1.46. Consult the Patchstack Vulnerability Report for the fixed release and vendor guidance.

Workarounds

Deactivate Blocksy Companion Pro until a fixed version is installed if the affected functionality is not business-critical.
Deploy virtual patching through a WAF to block unauthenticated requests to the vulnerable plugin endpoints.
Enforce rate limiting on plugin routes to slow identifier enumeration attempts.

bash

# Example WAF rule concept to block unauthenticated access
# to Blocksy Companion Pro endpoints referencing object IDs
SecRule REQUEST_URI "@rx /wp-(admin|json)/.*blocksy" \
    "id:1057630,phase:1,deny,status:403,\
    chain,msg:'CVE-2026-57630 IDOR block'"
    SecRule &REQUEST_COOKIES:wordpress_logged_in "@eq 0"