CVE-2026-15256: CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') in Ninja Forms
Ninja Forms WordPress plugin versions before 3.14.10 allow unauthenticated attackers to inject and execute arbitrary shortcodes via user-supplied query-string input used to pre-populate form fields. This occurs because the plugin does not properly neutralize special elements in output, leading to shortcode injection when a vulnerable form is embedded on a public page. The vulnerability is identified as CWE-74 and has a CVSS 3.1 base score of 4.8, indicating medium severity.
AI Analysis
Technical Summary
CVE-2026-15256 is an injection vulnerability in the Ninja Forms WordPress plugin prior to version 3.14.10. The plugin fails to prevent user-supplied query-string input, used to pre-populate form field default values, from being processed as shortcodes. This allows unauthenticated attackers to execute arbitrary shortcodes registered on the site when a form configured to use this input is embedded on a public page. The vulnerability is categorized under CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component).
Potential Impact
An unauthenticated attacker can exploit this vulnerability to execute arbitrary shortcodes on the affected WordPress site. This could lead to unintended actions or information disclosure depending on the shortcodes registered and their capabilities. The CVSS score of 4.8 reflects a medium impact with low confidentiality and integrity impact and no availability impact.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, avoid embedding forms that pre-populate fields from user-supplied query strings or disable shortcode processing in such contexts if possible.
CVE-2026-15256: CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') in Ninja Forms
Description
Ninja Forms WordPress plugin versions before 3.14.10 allow unauthenticated attackers to inject and execute arbitrary shortcodes via user-supplied query-string input used to pre-populate form fields. This occurs because the plugin does not properly neutralize special elements in output, leading to shortcode injection when a vulnerable form is embedded on a public page. The vulnerability is identified as CWE-74 and has a CVSS 3.1 base score of 4.8, indicating medium severity.
CVSS v3.1
Score 4.8medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-15256 is an injection vulnerability in the Ninja Forms WordPress plugin prior to version 3.14.10. The plugin fails to prevent user-supplied query-string input, used to pre-populate form field default values, from being processed as shortcodes. This allows unauthenticated attackers to execute arbitrary shortcodes registered on the site when a form configured to use this input is embedded on a public page. The vulnerability is categorized under CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component).
Potential Impact
An unauthenticated attacker can exploit this vulnerability to execute arbitrary shortcodes on the affected WordPress site. This could lead to unintended actions or information disclosure depending on the shortcodes registered and their capabilities. The CVSS score of 4.8 reflects a medium impact with low confidentiality and integrity impact and no availability impact.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, avoid embedding forms that pre-populate fields from user-supplied query strings or disable shortcode processing in such contexts if possible.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- WPScan
- Date Reserved
- 2026-07-09T13:02:53.705Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a7506f5bf8831d5395f5462
Added to database: 08/06/2026, 22:13:09 UTC
Last enriched: 08/06/2026, 23:58:07 UTC
Last updated: 08/07/2026, 01:41:21 UTC
Views: 2
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.