CVE-2026-86730

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-09-08. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.8Exploit: None knownExposed: 0

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

Craft CMS versions before 5.10.12 fail to properly cleanse string-typed field-layout elements, allowing authenticated control-panel users to inject Yii2 behavior attachments and event handlers. Attackers can post field-layout tab elements as JSON strings to bypass cleanse validation, then trigger arbitrary object instantiation and code execution through Craft::createObject().

CVSS v3
8.8
EG Score
8.8(high)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity88% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
51%
KEV
Not listed

Published

September 8, 2026

Last Modified

September 8, 2026

Advisory Details (2)

Auto-updated Sep 8, 2026
Patch available. Sources: github.
generic

Craft CMS 5.0.0-RC1 before 5.10.12 Behavior Injection RCE | Advisories | VulnCheck

https://www.vulncheck.com/advisories/craft-cms-5.0.0-rc1-before-5.10.12-behavior-injection-rce
github Patch Available

string-typed field-layout elements evade array-only cleanse, enabling behavior-injection RCE · Advisory · craftcms/cms · GitHub

https://github.com/craftcms/cms/security/advisories/GHSA-qj4v-m29p-fj4m

Vendor Advisories for CVE-2026-86730(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 27× in last 7d / 66× 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 11:08 UTCGHSA enrichment
  2. 2026-09-24 21:50 UTCEG score recompute
  3. 2026-09-24 21:50 UTCGHSA enrichment
  4. 2026-09-24 14:04 UTCEPSS rescore
  5. 2026-09-24 08:47 UTCGHSA enrichment
  6. 2026-09-23 20:04 UTCEG score recompute
  7. 2026-09-23 20:04 UTCGHSA enrichment
  8. 2026-09-23 17:54 UTCEPSS rescore
  9. 2026-09-23 07:21 UTCGHSA enrichment
  10. 2026-09-22 18:37 UTCEG score recompute
  11. 2026-09-22 18:37 UTCGHSA enrichment
  12. 2026-09-22 16:01 UTCEPSS rescore
  13. 2026-09-22 05:50 UTCEG score recompute
  14. 2026-09-22 05:50 UTCGHSA enrichment
  15. 2026-09-21 21:09 UTCEPSS rescore
  16. 2026-09-21 17:07 UTCGHSA enrichment
  17. 2026-09-21 04:17 UTCEG score recompute
  18. 2026-09-21 04:17 UTCGHSA enrichment
  19. 2026-09-20 20:16 UTCEPSS rescore
  20. 2026-09-20 15:34 UTCGHSA enrichment
  21. 2026-09-20 02:50 UTCEG score recompute
  22. 2026-09-20 02:50 UTCGHSA enrichment
  23. 2026-09-19 14:06 UTCGHSA enrichment
  24. 2026-09-19 01:22 UTCEG score recompute
  25. 2026-09-19 01:22 UTCGHSA enrichment
Show 41 more
  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-18 12:39 UTCGHSA enrichment
  3. 2026-09-17 23:55 UTCEG score recompute
  4. 2026-09-17 23:55 UTCGHSA enrichment
  5. 2026-09-17 19:32 UTCEPSS rescore
  6. 2026-09-17 10:25 UTCGHSA enrichment
  7. 2026-09-16 21:41 UTCEG score recompute
  8. 2026-09-16 21:41 UTCGHSA enrichment
  9. 2026-09-16 14:09 UTCEPSS rescore
  10. 2026-09-16 08:57 UTCEG score recompute
  11. 2026-09-16 08:57 UTCGHSA enrichment
  12. 2026-09-16 05:15 UTCEPSS rescore
  13. 2026-09-15 19:46 UTCGHSA enrichment
  14. 2026-09-15 07:03 UTCEG score recompute
  15. 2026-09-15 07:03 UTCGHSA enrichment
  16. 2026-09-15 03:12 UTCEPSS rescore
  17. 2026-09-15 03:12 UTCEPSS rescore
  18. 2026-09-14 18:20 UTCGHSA enrichment
  19. 2026-09-14 04:53 UTCEG score recompute
  20. 2026-09-14 04:53 UTCGHSA enrichment
  21. 2026-09-13 16:10 UTCGHSA enrichment
  22. 2026-09-13 03:27 UTCEG score recompute
  23. 2026-09-13 03:27 UTCGHSA enrichment
  24. 2026-09-12 14:44 UTCGHSA enrichment
  25. 2026-09-12 02:00 UTCEG score recompute
  26. 2026-09-12 02:00 UTCGHSA enrichment
  27. 2026-09-11 14:53 UTCEPSS rescore
  28. 2026-09-11 14:53 UTCEPSS rescore
  29. 2026-09-11 13:16 UTCEG score recompute
  30. 2026-09-11 13:16 UTCGHSA enrichment
  31. 2026-09-11 00:33 UTCGHSA enrichment
  32. 2026-09-10 11:49 UTCEG score recompute
  33. 2026-09-10 11:49 UTCGHSA enrichment
  34. 2026-09-09 23:06 UTCGHSA enrichment
  35. 2026-09-09 08:54 UTCGHSA enrichment
  36. 2026-09-08 20:11 UTCEG score recompute
  37. 2026-09-08 20:11 UTCGHSA enrichment
  38. 2026-09-08 16:44 UTCEG score recompute
  39. 2026-09-08 15:50 UTCEG score recompute
  40. 2026-09-08 15:25 UTCEG score recompute
  41. 2026-09-08 15:24 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-86730?
CVE-2026-86730 is a high vulnerability published on September 8, 2026. Craft CMS versions before 5.10.12 fail to properly cleanse string-typed field-layout elements, allowing authenticated control-panel users to inject Yii2 behavior attachments and event handlers. Attackers can post field-layout tab elements as JSON strings to bypass cleanse validation, then trigger…
When was CVE-2026-86730 disclosed?
CVE-2026-86730 was first published in the National Vulnerability Database on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-86730 actively exploited?
CVE-2026-86730 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 48.6% of all scored CVEs.
What is the CVSS score of CVE-2026-86730?
CVE-2026-86730 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-86730?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-86730, 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-2026-86730

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