CVE-2026-39808

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-04-14. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 49%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(medium)
EPSS
98.7%
KEV
Not listed

Published

April 14, 2026

Last Modified

April 22, 2026

Advisory Details (2)

Auto-updated May 12, 2026
No patch confirmed yet.
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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 25× 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 140 total refreshes for this CVE.

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

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(5)

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 April 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-39808 actively exploited?
CVE-2026-39808 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 98.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-39808?
CVE-2026-39808 has a CVSS v3 base score of 9.8 (NVD).
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

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