CVE-2026-4066 | inc2734 Smart Custom Fields Plugin up to 5.0.6 on WordPress relational_posts_search authorization

VDB-352651 · CVE-2026-4066 · GCVE-0-2026-4066 INC2734 SMART CUSTOM FIELDS PLUGIN UP TO 5.0.6 ON WORDPRESS RELATIONAL_POSTS_SEARCH AUTHORIZATION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 4.2 $0-$5k 1.35+ Summaryinfo A vulnerability was found in inc2734 Smart Custom Fields Plugin up to 5.0.6 on WordPress. It has been classified as problematic. This affects the function relational_posts_search. This manipulation causes authorization. This vulnerability is handled as CVE-2026-4066. The attack can be initiated remotely. There is not any exploit available. Detailsinfo A vulnerability has been found in inc2734 Smart Custom Fields Plugin up to 5.0.6 on WordPress and classified as problematic. Affected by this vulnerability is the function relational_posts_search. The manipulation with an unknown input leads to a authorization vulnerability. The CWE definition for the vulnerability is CWE-862. The product does not perform an authorization check when an actor attempts to access a resource or perform an action. As an impact it is known to affect confidentiality. The summary by CVE is: The Smart Custom Fields plugin for WordPress is vulnerable to unauthorized access of data due to a missing capability check on the relational_posts_search() function in all versions up to, and including, 5.0.6. This makes it possible for authenticated attackers, with Contributor-level access and above, to read private and draft post content from other authors via the smart-cf-relational-posts-search AJAX action. The function queries posts with post_status=any and returns full WP_Post objects including post_content, but only checks the generic edit_posts capability instead of verifying whether the requesting user has permission to read each individual post. The weakness was released by darkestmode. It is possible to read the advisory at wordfence.com. This vulnerability is known as CVE-2026-4066 since 03/12/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 03/24/2026). There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product. Productinfo Type WordPress Plugin Vendor inc2734 Name Smart Custom Fields Plugin Version 5.0.0 5.0.1 5.0.2 5.0.3 5.0.4 5.0.5 5.0.6 CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 4.3 VulDB Meta Temp Score: 4.2 VulDB Base Score: 4.3 VulDB Temp Score: 4.2 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 4.3 CNA Vector (Wordfence): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Authorization CWE: CWE-862 / CWE-863 / CWE-285 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: no mitigation known Status: 🔍 0-Day Time: 🔒 Timelineinfo 03/12/2026 CVE reserved 03/24/2026 +12 days Advisory disclosed 03/24/2026 +0 days VulDB entry created 03/24/2026 +0 days VulDB entry last update Sourcesinfo Advisory: wordfence.com Researcher: darkestmode Status: Not defined CVE: CVE-2026-4066 (🔒) GCVE (CVE): GCVE-0-2026-4066 GCVE (VulDB): GCVE-100-352651 Entryinfo Created: 03/24/2026 02:56 Changes: 03/24/2026 02:56 (64) Complete: 🔍 Cache ID: 99:9AB:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸