Medium severity · published Aug 6, 2026
CVE-2026-15256
Ninja Forms < 3.14.10 - Unauthenticated Arbitrary Shortcode Execution via Query-String Populated Field Default
4.8
CVSS
0.2%
EPSS
No
On KEV
Description
The Ninja Forms WordPress plugin before 3.14.10 does not prevent user-supplied query-string input, used to pre-populate a form field's default value, from being processed as a shortcode, allowing unauthenticated attackers to execute arbitrary shortcodes registered on the site when a form so configured is embedded on a public page.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 15% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NF
Ninja Forms ·
before 3.14.10 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-15256
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-15256
wpscan.com
https://wpscan.com/vulnerability/9c96f977-c105-4b45-a3cd-4751fb4aa5a1/
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