CVE-2026-91827

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-22. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.5Exploit: None knownExposed: 0

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

The Ninja Forms WordPress plugin 3.15.3 does not prevent user-submitted form field values from being deserialised when an administrator later exports form submissions to CSV, allowing unauthenticated attackers to perform PHP Object Injection; if a suitable POP chain is present via another installed plugin or theme, this can lead to actions such as arbitrary file operations or remote code execution.

CVSS v3
7.5
EG Score
7.5(high)
EG Risk
34(Track)
EG Risk 34/100SSVC: 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
Severity75% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
42%
KEV
Not listed

Published

September 22, 2026

Last Modified

September 22, 2026

Advisory Details (1)

Auto-updated Sep 22, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

Ninja Forms 3.15.3 – Unauthenticated PHP Object Injection via CSV Export | CVE 2026-91827 | Plugin Vulnerabilities

https://wpscan.com/vulnerability/7b279db2-92e0-4122-b5c6-aa12b7b01858/

Vendor Advisories for CVE-2026-91827(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 / 19× 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. 2026-09-25 09:40 UTCGHSA enrichment
  2. 2026-09-24 21:28 UTCEG score recompute
  3. 2026-09-24 21:28 UTCGHSA enrichment
  4. 2026-09-24 14:04 UTCEPSS rescore
  5. 2026-09-24 08:26 UTCGHSA enrichment
  6. 2026-09-23 20:15 UTCEG score recompute
  7. 2026-09-23 20:15 UTCGHSA enrichment
  8. 2026-09-23 17:54 UTCEPSS rescore
  9. 2026-09-23 08:04 UTCGHSA enrichment
  10. 2026-09-22 19:52 UTCEG score recompute
  11. 2026-09-22 19:52 UTCGHSA enrichment
  12. 2026-09-22 16:01 UTCEPSS rescore
  13. 2026-09-22 11:36 UTCEG score recompute
  14. 2026-09-22 11:35 UTCGHSA enrichment
  15. 2026-09-22 10:27 UTCEG score recompute
  16. 2026-09-22 10:26 UTCGHSA enrichment
  17. 2026-09-22 07:34 UTCEG score recompute
  18. 2026-09-22 07:11 UTCEG score recompute
  19. 2026-09-22 07:10 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-91827?
CVE-2026-91827 is a high vulnerability published on September 22, 2026. The Ninja Forms WordPress plugin 3.15.3 does not prevent user-submitted form field values from being deserialised when an administrator later exports form submissions to CSV, allowing unauthenticated attackers to perform PHP Object Injection; if a suitable POP chain is present via another installed…
When was CVE-2026-91827 disclosed?
CVE-2026-91827 was first published in the National Vulnerability Database on September 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-91827 actively exploited?
CVE-2026-91827 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 58.0% of all scored CVEs.
What is the CVSS score of CVE-2026-91827?
CVE-2026-91827 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-91827?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-91827, 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

Explore the affected products and dependency analysis for CVE-2026-91827

Explore →

Is Your Infrastructure Affected by CVE-2026-91827?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs