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 — 4 sources updated this weekExploited in the wild
9.8EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 93%CVSS: 9.8Exploit: cisa kev · ssvc active · epss top5pct · epss high · public exploitExposed: 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)
EG Risk
99(Act)
EG Risk 99/100SSVC: Act

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
Severity98% × 45%
Exploitation100% × 40%
Automatability100% × 15%
Action: Fix now — active exploitation, automatable, high impact.
EPSS PROB
93%
EPSS %ILE
100%
KEV
⚠ Exploited

Published

April 14, 2026

Last Modified

July 17, 2026

Advisory Details (3)

Auto-updated Sep 12, 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

Just a moment

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 / 232× 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 561 total refreshes for this CVE.

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

Publicly available exploits

(4 references)

Working exploit code is in the public domain (3 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCynsmroztas/FortiSandbox-RCE-Exploit-CVE-2026-39808
    First seen Apr 21, 2026

    FortiSandbox RCE Scanner — CVE-2026-39808

    Open source ↗
  • GitHub PoC0xBlackash/CVE-2026-39808
    First seen Apr 18, 2026

    CVE-2026-39808

    Open source ↗
  • GitHub PoCsamu-delucas/CVE-2026-39808
    First seen Apr 15, 2026

    PoC for Unauthenticated RCE in FortiSandbox via CVE-2026-39808

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

    Fortinet FortiSandbox - Command Injection

    Open source ↗

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

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