Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
Unknown Ninja Forms — Ninja Forms < 3.14.10 - Unauthenticated Arbitrary Shortcode Execution via Query-String Populated Field Default
AV AC PR UI S C I A CVSS EPSS %ile KEV
N H N N U L L N 4.8 .0019 8.7 —
AFFECTED
Product Versions Fixed
Ninja Forms unspecified —
TIMELINE
Jul 9 Reserved by WPScan
Aug 6 Published (CNA: WPScan)
Aug 7 EXPLOIT PUBLISHED — CVE-2026-15256 (Unknown Ninja Forms). Public exploit reference added.
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.
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
|---|
| July 9, 2026 | Reserved | Reserved by WPScan |
| August 6, 2026 | Published | Published (CNA: WPScan) |
| August 7, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-15256 (Unknown Ninja Forms). Public exploit reference added. |
Affected
Affected products and packages — 1 row
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| Unknown | Ninja Forms | — | — | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-15256 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.