CVE-2026-1947
Published: 16 March 2026
Summary
CVE-2026-1947 is a high-severity Authorization Bypass Through User-Controlled Key (CWE-639) vulnerability in Wordpress (inferred from references). Its CVSS base score is 7.5 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 6.5th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 AC-3 (Access Enforcement) and SI-10 (Information Input Validation).
Deeper analysis
CVE-2026-1947 is an Insecure Direct Object Reference vulnerability (CWE-639) in the NEX-Forms – Ultimate Forms Plugin for WordPress, affecting all versions up to and including 9.1.9. The flaw exists in the submit_nex_form() function due to missing validation of a user-controlled key, specifically the 'nf_set_entry_update_id' parameter.
Unauthenticated attackers can exploit this vulnerability over the network with low complexity and no user interaction required, as indicated by its CVSS v3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N). Successful exploitation allows attackers to overwrite arbitrary form entries, leading to high integrity impact without affecting confidentiality or availability.
Advisories and patches are referenced in the WordPress plugins trac changeset at https://plugins.trac.wordpress.org/changeset/3470888/nex-forms-express-wp-form-builder and Wordfence threat intelligence at https://www.wordfence.com/threat-intel/vulnerabilities/id/b2a8c307-2430-4ea9-afe0-e5e758eabdd1?source=cve.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-12200
Vulnerability details
The NEX-Forms – Ultimate Forms Plugin for WordPress plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 9.1.9 via the submit_nex_form() function due to missing validation on a user controlled key. This…
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makes it possible for unauthenticated attackers to to overwrite arbitrary form entries via the 'nf_set_entry_update_id' parameter.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
IDOR in public-facing WordPress plugin enables remote unauthenticated exploitation (T1190) and direct stored data overwrite (T1565.001).
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
AC-3 enforces approved authorizations for access to system resources like form entries, directly preventing unauthenticated attackers from overwriting arbitrary entries via the unchecked 'nf_set_entry_update_id' parameter.
SI-10 requires validation of user-controlled inputs such as 'nf_set_entry_update_id' at system entry points, mitigating the missing validation that enables IDOR exploitation.
AC-6 applies least privilege to restrict unauthenticated users from update privileges on form entries, reducing the impact of the IDOR vulnerability.