CVE-2026-4160 | techjewel Fluent Forms Plugin 6.1.21 on WordPress AJAX Endpoint submission_id authorization

VDB-357921 · CVE-2026-4160 · GCVE-0-2026-4160 TECHJEWEL FLUENT FORMS PLUGIN 6.1.21 ON WORDPRESS AJAX ENDPOINT SUBMISSION_ID AUTHORIZATION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 6.2 $0-$5k 2.13+ Summaryinfo A vulnerability marked as critical has been reported in techjewel Fluent Forms Plugin 6.1.21 on WordPress. This vulnerability affects unknown code of the component AJAX Endpoint. Performing a manipulation of the argument submission_id results in authorization. This vulnerability is identified as CVE-2026-4160. The attack can be initiated remotely. There is not any exploit available. Detailsinfo A vulnerability classified as critical has been found in techjewel Fluent Forms Plugin 6.1.21 on WordPress. This affects an unknown code of the component AJAX Endpoint. The manipulation of the argument submission_id with an unknown input leads to a authorization vulnerability. CWE is classifying the issue as CWE-639. The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is: The Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder plugin for WordPress is vulnerable to Insecure Direct Object Reference via the 'submission_id' parameter in versions up to, and including, 6.1.21. This is due to missing authorization and ownership validation on a user controlled key in the Stripe SCA confirmation AJAX endpoint. This makes it possible for unauthenticated attackers to modify payment status of targeted pending submissions (for example, setting the status to "failed"). The weakness was released by Prickly Cactus. The advisory is shared at wordfence.com. This vulnerability is uniquely identified as CVE-2026-4160 since 03/13/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 04/16/2026). 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 techjewel Name Fluent Forms Plugin Version 6.1.21 CPE 2.3info 🔒 CPE 2.2info 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 6.3 VulDB Meta Temp Score: 6.2 VulDB Base Score: 7.3 VulDB Temp Score: 7.1 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 5.3 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-639 / CWE-285 / CWE-266 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 03/13/2026 CVE reserved 04/16/2026 +33 days Advisory disclosed 04/16/2026 +0 days VulDB entry created 04/16/2026 +0 days VulDB entry last update Sourcesinfo Advisory: wordfence.com Researcher: Prickly Cactus Status: Not defined CVE: CVE-2026-4160 (🔒) GCVE (CVE): GCVE-0-2026-4160 GCVE (VulDB): GCVE-100-357921 Entryinfo Created: 04/16/2026 16:43 Changes: 04/16/2026 16:43 (65) Complete: 🔍 Cache ID: 99:EAB:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸