CVE-2026-0894 | vanderwijk Content Blocks Plugin up to 3.3.9 on WordPress Custom Post Widget content_block cross site scripting

VDB-358193 · CVE-2026-0894 · GCVE-0-2026-0894 VANDERWIJK CONTENT BLOCKS PLUGIN UP TO 3.3.9 ON WORDPRESS CUSTOM POST WIDGET CONTENT_BLOCK CROSS SITE SCRIPTING HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 4.9 $0-$5k 5.36+ Summaryinfo A vulnerability has been found in vanderwijk Content Blocks Plugin up to 3.3.9 on WordPress and classified as problematic. Affected by this vulnerability is the function content_block of the component Custom Post Widget. The manipulation leads to cross site scripting. This vulnerability is listed as CVE-2026-0894. The attack may be initiated remotely. There is no available exploit. Detailsinfo A vulnerability, which was classified as problematic, has been found in vanderwijk Content Blocks Plugin up to 3.3.9 on WordPress. This issue affects the function content_block of the component Custom Post Widget. The manipulation with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. Impacted is integrity. The summary by CVE is: The Content Blocks (Custom Post Widget) plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's content_block shortcode in all versions up to, and including, 3.3.9 due to insufficient input sanitization and output escaping on user supplied values consumed from user-created content blocks. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The weakness was presented by Muhammad Yudha. The advisory is shared at wordfence.com. The identification of this vulnerability is CVE-2026-0894 since 01/13/2026. The exploitation is known to be easy. The attack may be initiated remotely. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue. 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 vanderwijk Name Content Blocks Plugin Version 3.3.0 3.3.1 3.3.2 3.3.3 3.3.4 3.3.5 3.3.6 3.3.7 3.3.8 3.3.9 CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 4.9 VulDB Meta Temp Score: 4.9 VulDB Base Score: 3.5 VulDB Temp Score: 3.4 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 6.4 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: Cross site scripting CWE: CWE-79 / CWE-94 / CWE-74 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 01/13/2026 CVE reserved 04/18/2026 +94 days Advisory disclosed 04/18/2026 +0 days VulDB entry created 04/18/2026 +0 days VulDB entry last update Sourcesinfo Advisory: wordfence.com Researcher: Muhammad Yudha Status: Not defined CVE: CVE-2026-0894 (🔒) GCVE (CVE): GCVE-0-2026-0894 GCVE (VulDB): GCVE-100-358193 Entryinfo Created: 04/18/2026 12:34 Changes: 04/18/2026 12:34 (66) Complete: 🔍 Cache ID: 99:12D:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸