CVE-2026-15256

MEDIUMPre-NVD 4.84.8—
EchelonGraph scoreHIGH confidence

Score 4.8 from GitHub Security Advisory published 2026-08-07. a secondary CVSS source baseline 4.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
4.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.8Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
4.8
EG Score
4.8(high)
EG Risk
38(Track)
EG Risk 38/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity48% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
9%
KEV
Not listed

Published

August 6, 2026

Last Modified

August 7, 2026

Advisory Details (1)

Auto-updated Aug 6, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

Ninja Forms < 3.14.10 – Unauthenticated Arbitrary Shortcode Execution via Query-String Populated Field Default | CVE 2026-15256 | Plugin Vulnerabilities

https://wpscan.com/vulnerability/9c96f977-c105-4b45-a3cd-4751fb4aa5a1/

Vendor Advisories for CVE-2026-15256(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 19× in last 7d / 38× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-19 17:03 UTCEPSS rescore
  2. 2026-08-19 13:31 UTCEG score recompute
  3. 2026-08-19 13:31 UTCGHSA enrichment
  4. 2026-08-18 13:48 UTCEPSS rescore
  5. 2026-08-18 11:31 UTCEG score recompute
  6. 2026-08-18 11:31 UTCGHSA enrichment
  7. 2026-08-17 13:47 UTCEPSS rescore
  8. 2026-08-17 09:30 UTCEG score recompute
  9. 2026-08-17 09:30 UTCGHSA enrichment
  10. 2026-08-16 14:56 UTCEPSS rescore
  11. 2026-08-16 07:30 UTCEG score recompute
  12. 2026-08-16 07:30 UTCGHSA enrichment
  13. 2026-08-16 02:14 UTCEPSS rescore
  14. 2026-08-15 05:30 UTCEG score recompute
  15. 2026-08-15 05:30 UTCGHSA enrichment
  16. 2026-08-15 01:30 UTCEPSS rescore
  17. 2026-08-14 03:29 UTCEG score recompute
  18. 2026-08-14 03:29 UTCGHSA enrichment
  19. 2026-08-13 22:00 UTCEPSS rescore
  20. 2026-08-13 01:29 UTCEG score recompute
  21. 2026-08-13 01:29 UTCGHSA enrichment
  22. 2026-08-12 13:50 UTCEPSS rescore
  23. 2026-08-11 23:29 UTCEG score recompute
  24. 2026-08-11 23:29 UTCGHSA enrichment
  25. 2026-08-11 13:42 UTCEPSS rescore
Show 13 more
  1. 2026-08-11 00:00 UTCEPSS rescore
  2. 2026-08-10 21:29 UTCGHSA enrichment
  3. 2026-08-09 19:28 UTCEG score recompute
  4. 2026-08-09 19:28 UTCGHSA enrichment
  5. 2026-08-09 13:46 UTCEPSS rescore
  6. 2026-08-08 17:28 UTCEG score recompute
  7. 2026-08-08 17:28 UTCGHSA enrichment
  8. 2026-08-07 15:27 UTCEG score recompute
  9. 2026-08-07 15:27 UTCGHSA enrichment
  10. 2026-08-07 14:38 UTCEG score recompute
  11. 2026-08-07 14:38 UTCGHSA enrichment
  12. 2026-08-06 22:17 UTCEG score recompute
  13. 2026-08-06 22:15 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-15256?
CVE-2026-15256 is a medium vulnerability published on August 6, 2026. 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…
When was CVE-2026-15256 disclosed?
CVE-2026-15256 was first published in the National Vulnerability Database on August 6, 2026, with the most recent update on August 7, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-15256 actively exploited?
CVE-2026-15256 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 91.3% of all scored CVEs.
What is the CVSS score of CVE-2026-15256?
CVE-2026-15256 has a CVSS v3 base score of 4.8 (NVD).
How do I remediate CVE-2026-15256?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-15256, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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