High severity · published May 3, 2026
CVE-2026-5063
NEX-Forms <= 9.1.11 - Unauthenticated Stored Cross-Site Scripting via POST Parameter Key Names
7.2
CVSS
0.2%
EPSS
No
On KEV
Description
The NEX-Forms – Ultimate Forms Plugin for WordPress plugin for WordPress is vulnerable to Stored Cross-Site Scripting via POST parameter key names in the submit_nex_form() function in versions up to, and including, 9.1.11 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 16% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NU
NEX-Forms – Ultimate Forms Plugin for WordPress · webaways
through 9.1.11 · source: vendor
Affected product
NU
NEX-Forms – Ultimate Forms Plugin for WordPress
webaways
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-5063
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-5063
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/changeset/3513524/nex-forms-express-wp-form-builder
www.wordfence.com
https://www.wordfence.com/threat-intel/vulnerabilities/id/9bac82ee-55bf-4381-b441-115a675e4834?source=cve
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