CVE-2026-39808

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score elevated to 9.8 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2026-07-16), indicating real-world exploitation has been confirmed by US federal agencies. a secondary CVSS source baseline 9.8 retained for reference (NVD's own analysis pending). Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, secondary
Trending — KEV-added this weekExploited in the wild
9.8
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 84%CVSS: 9.8Exploit: NoneExposed: 0

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

A improper neutralization of special elements used in an os command ('os command injection') vulnerability in Fortinet FortiSandbox 4.4.0 through 4.4.8 may allow attacker to execute unauthorized code or commands via

CVSS v3
9.8
EG Score
9.8(high)
EPSS
99.7%
KEV
⚠ Exploited

Published

April 14, 2026

Last Modified

July 17, 2026

Advisory Details (3)

Auto-updated Jul 17, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-39808
generic

GitHub - samu-delucas/CVE-2026-39808: PoC for Unauthenticated RCE in FortiSandbox via CVE-2026-39808 · GitHub

https://github.com/samu-delucas/CVE-2026-39808
generic

PSIRT | FortiGuard Labs

https://fortiguard.fortinet.com/psirt/FG-IR-26-100

Vendor Advisories for CVE-2026-39808(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 54× in last 7d / 72× 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.

Showing the most recent 100 of 156 total refreshes for this CVE.

  1. 2026-07-22 14:08 UTCEPSS rescore
  2. 2026-07-22 12:11 UTCGHSA enrichment
  3. 2026-07-22 08:30 UTCGHSA enrichment
  4. 2026-07-22 04:48 UTCGHSA enrichment
  5. 2026-07-22 01:05 UTCGHSA enrichment
  6. 2026-07-21 21:24 UTCGHSA enrichment
  7. 2026-07-21 17:43 UTCEG score recompute
  8. 2026-07-21 17:43 UTCGHSA enrichment
  9. 2026-07-21 15:24 UTCEPSS rescore
  10. 2026-07-21 14:37 UTCCISA KEV update
  11. 2026-07-21 14:02 UTCGHSA enrichment
  12. 2026-07-21 10:18 UTCGHSA enrichment
  13. 2026-07-21 06:37 UTCGHSA enrichment
  14. 2026-07-21 02:57 UTCGHSA enrichment
  15. 2026-07-20 23:16 UTCGHSA enrichment
  16. 2026-07-20 19:35 UTCGHSA enrichment
  17. 2026-07-20 15:54 UTCGHSA enrichment
  18. 2026-07-20 12:13 UTCGHSA enrichment
  19. 2026-07-20 08:31 UTCGHSA enrichment
  20. 2026-07-20 04:51 UTCGHSA enrichment
  21. 2026-07-19 21:29 UTCGHSA enrichment
  22. 2026-07-19 17:48 UTCEG score recompute
  23. 2026-07-19 17:48 UTCGHSA enrichment
  24. 2026-07-19 14:31 UTCEPSS rescore
  25. 2026-07-19 14:07 UTCGHSA enrichment
Show 75 more
  1. 2026-07-19 10:26 UTCGHSA enrichment
  2. 2026-07-19 06:45 UTCGHSA enrichment
  3. 2026-07-19 03:04 UTCGHSA enrichment
  4. 2026-07-18 23:23 UTCGHSA enrichment
  5. 2026-07-18 19:43 UTCGHSA enrichment
  6. 2026-07-18 16:02 UTCGHSA enrichment
  7. 2026-07-18 12:22 UTCEG score recompute
  8. 2026-07-18 12:22 UTCGHSA enrichment
  9. 2026-07-18 10:04 UTCEPSS rescore
  10. 2026-07-18 08:41 UTCGHSA enrichment
  11. 2026-07-18 05:00 UTCGHSA enrichment
  12. 2026-07-18 01:19 UTCGHSA enrichment
  13. 2026-07-17 21:38 UTCGHSA enrichment
  14. 2026-07-17 17:56 UTCGHSA enrichment
  15. 2026-07-17 14:14 UTCGHSA enrichment
  16. 2026-07-17 10:33 UTCGHSA enrichment
  17. 2026-07-17 06:52 UTCGHSA enrichment
  18. 2026-07-17 05:25 UTCNVD updateCVSS v3 → 9.8
  19. 2026-07-17 04:07 UTCGHSA enrichment
  20. 2026-07-17 00:26 UTCGHSA enrichment
  21. 2026-07-16 20:46 UTCGHSA enrichment
  22. 2026-07-16 20:09 UTCMITRE cvelistV5CVSS v3 → 9.1
  23. 2026-07-16 18:30 UTCNVD updateCVSS v3 → 9.8
  24. 2026-07-16 17:53 UTCMITRE cvelistV5CVSS v3 → 9.1
  25. 2026-07-16 17:05 UTCGHSA enrichment
  26. 2026-07-16 17:04 UTCCISA KEV update
  27. 2026-07-16 17:03 UTCEPSS rescore
  28. 2026-07-15 16:57 UTCEPSS rescore
  29. 2026-07-15 16:57 UTCEPSS rescore
  30. 2026-07-13 22:30 UTCEPSS rescore
  31. 2026-07-13 06:13 UTCEPSS rescore
  32. 2026-07-13 06:13 UTCEPSS rescore
  33. 2026-07-12 05:46 UTCEPSS rescore
  34. 2026-07-11 08:27 UTCEPSS rescore
  35. 2026-07-09 19:10 UTCEPSS rescore
  36. 2026-07-08 15:15 UTCEPSS rescore
  37. 2026-07-07 13:46 UTCEPSS rescore
  38. 2026-07-05 02:30 UTCEPSS rescore
  39. 2026-07-01 15:06 UTCEPSS rescore
  40. 2026-06-30 23:22 UTCEPSS rescore
  41. 2026-06-29 14:06 UTCEPSS rescore
  42. 2026-06-28 04:56 UTCEPSS rescore
  43. 2026-06-27 03:08 UTCEPSS rescore
  44. 2026-06-25 13:49 UTCEPSS rescore
  45. 2026-06-25 13:49 UTCEPSS rescore
  46. 2026-06-24 14:05 UTCEPSS rescore
  47. 2026-06-23 21:33 UTCEPSS rescore
  48. 2026-06-21 01:59 UTCEPSS rescore
  49. 2026-06-18 17:52 UTCEPSS rescore
  50. 2026-06-18 17:52 UTCEPSS rescore
  51. 2026-06-17 17:53 UTCEPSS rescore
  52. 2026-06-16 17:52 UTCEPSS rescore
  53. 2026-06-15 17:49 UTCEPSS rescore
  54. 2026-06-15 04:00 UTCGHSA enrichment
  55. 2026-06-14 23:18 UTCEPSS rescore
  56. 2026-06-14 21:23 UTCGHSA enrichment
  57. 2026-06-13 23:00 UTCEPSS rescore
  58. 2026-06-12 23:12 UTCEPSS rescore
  59. 2026-06-12 23:12 UTCEPSS rescore
  60. 2026-06-12 06:31 UTCGHSA enrichment
  61. 2026-06-12 02:51 UTCGHSA enrichment
  62. 2026-06-11 23:10 UTCGHSA enrichment
  63. 2026-06-11 19:26 UTCGHSA enrichment
  64. 2026-06-11 14:00 UTCEPSS rescore
  65. 2026-06-10 23:17 UTCGHSA enrichment
  66. 2026-06-10 22:18 UTCEPSS rescore
  67. 2026-06-10 19:37 UTCGHSA enrichment
  68. 2026-06-10 15:56 UTCGHSA enrichment
  69. 2026-06-10 13:22 UTCEPSS rescore
  70. 2026-06-10 12:16 UTCGHSA enrichment
  71. 2026-06-10 08:33 UTCGHSA enrichment
  72. 2026-06-10 04:51 UTCGHSA enrichment
  73. 2026-06-10 00:39 UTCGHSA enrichment
  74. 2026-06-09 18:12 UTCGHSA enrichment
  75. 2026-06-09 14:31 UTCGHSA enrichment

Publicly available exploits

(1 reference)

Working exploit code is in the public domain. Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Nucleihttp/cves/2026/CVE-2026-39808.yaml
    First seen Jan 1, 2026

    Fortinet FortiSandbox - Command Injection

    Open source ↗

Related CVEs(same CWE)

Frequently asked(6)

What is CVE-2026-39808?
CVE-2026-39808 is a critical vulnerability published on April 14, 2026. A improper neutralization of special elements used in an os command ('os command injection') vulnerability in Fortinet FortiSandbox 4.4.0 through 4.4.8 may allow attacker to execute unauthorized code or commands via <insert attack vector here>
When was CVE-2026-39808 disclosed?
CVE-2026-39808 was first published in the National Vulnerability Database on April 14, 2026, with the most recent update on July 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-39808 actively exploited?
Yes. CISA added CVE-2026-39808 to the Known Exploited Vulnerabilities catalog on July 16, 2026, affecting Fortinet FortiSandbox. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2026-39808?
CVE-2026-39808 has a CVSS v3 base score of 9.8 (NVD).
Which products are affected by CVE-2026-39808?
CVE-2026-39808 affects Fortinet FortiSandbox. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2026-39808?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-39808, 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-2026-39808

Explore →

Is Your Infrastructure Affected by CVE-2026-39808?

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

Start Free Scan →Browse All CVEs