CVE-2026-4056

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{}

{"affected": [{"configurations": [{"platform": null, "status": "unaffected", "versions": null}], "enrichment": {"confidence": 80.0, "confidence_source": "inferred", "scores": [{"score": 80.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "product": "wordpress", "vendor": "wordpress"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,5.1.4]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "User Registration & Membership \u2013 Free & Paid Memberships, Subscriptions, Content Restriction, User Profile, Custom User Registration & Login Builder", "source": "cna", "vendor": "wpeverest"}, "product": "user_registration_&_membership_\u2013_free_&_paid_memberships,_subscriptions,_content_restriction,_user_profile,_custom_user_registration_&_login_builder", "vendor": "wpeverest"}], "analysis": {"en": {"generated_at": "2026-03-24T03:54:54.136135+00:00", "value": {"mitigation_remediation": ["Update the User Registration & Membership plugin to the latest available version (at least 5.1.5).", "Confirm that the REST API endpoints for content restriction rules no longer accept changes from Contributor-level users.", "If an update is unavailable, remove or throttle Contributor permissions for the plugin or disable the affected REST API endpoints from user accounts.", "Monitor WordPress logs for unexpected rule creation or modification events to detect any remaining unauthorized activity."], "summary": {"action": "Immediate Patch", "impact": "Unauthorized Modification of Content Restriction Rules"}, "threat_synthesis": {"affected_systems": "WordPress sites running the User Registration & Membership plugin versions 5.0.1 through 5.1.4 are affected. The plugin, offered by WP Everest, provides free and paid memberships, subscriptions, content restriction, user profiles, and a custom user registration and login builder. All installations using these versions of the plugin are susceptible.", "description_and_impact": "The User Registration & Membership plugin for WordPress permits authenticated users with Contributor-level permissions to misconfigure site-wide content restriction rules. The vulnerability arises from a missing capability check on the plugin\u2019s REST API endpoints, where the check_permissions function only verifies the edit_posts capability instead of an administrator-level privilege. As a result, malicious contributors can list, create, modify, toggle, duplicate, and delete content restriction rules, exposing restricted material or denying legitimate users access. The weakness can lead to data exposure or denial of service for protected content.", "risk_and_exploitability": "The CVSS score of 5.4 indicates moderate severity. Exploitation requires a valid user account with Contributor or higher privileges; no public exploit is listed in the CISA KEV catalog and EPSS data is unavailable. Because the attack vector is authenticated and dependent on the REST API, the likelihood of widespread exploitation is lower than for unauthenticated flaws, yet the impact on business processes\u2014especially when content visibility is critical\u2014requires prompt attention."}}}}, "created": "2026-03-24T10:29:54.912249+00:00", "updated": "2026-03-25T20:36:02.300219+00:00", "vendors": ["wordpress", "wordpress$PRODUCT$wordpress", "wpeverest", "wpeverest$PRODUCT$user_registration_&_membership_\u2013_free_&_paid_memberships,_subscriptions,_content_restriction,_user_profile,_custom_user_registration_&_login_builder"]}