CVE-2026-65639

CRITICALPre-NVD 9.59.5—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 1.4%, top 28% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this week
9.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.5Exploit: None knownExposed: 0

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

OS command injection in the advanced-rule parser of ConfigServer Security & Firewall allows a remote attacker who controls a configured allow/deny feed to execute arbitrary commands as root, due to insufficient validation of feed-supplied rule data.

The vulnerability affects versions of the software originally distributed by ConfigServer, as well as versions of the WebPros-maintained fork that contain the vulnerable code. WebPros has addressed the vulnerability in version 16.30. Other forks or independently maintained versions of ConfigServer Security & Firewall (CSF) may also be affected and should be evaluated independently.

CVSS v3
9.5
EG Score
9.5(medium)
EG Risk
43(Track)
EG Risk 43/100SSVC: 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
Severity95% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
72%
KEV
Not listed

Published

September 10, 2026

Last Modified

September 10, 2026

References (1)

Vendor Advisories for CVE-2026-65639(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 / 117× 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 117 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-65639?
CVE-2026-65639 is a critical vulnerability published on September 10, 2026. OS command injection in the advanced-rule parser of ConfigServer Security & Firewall allows a remote attacker who controls a configured allow/deny feed to execute arbitrary commands as root, due to insufficient validation of feed-supplied rule data. The vulnerability affects versions of the…
When was CVE-2026-65639 disclosed?
CVE-2026-65639 was first published in the National Vulnerability Database on September 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-65639 actively exploited?
CVE-2026-65639 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 28.3% of all scored CVEs.
What is the CVSS score of CVE-2026-65639?
CVE-2026-65639 has a CVSS v3 base score of 9.5 (NVD).
How do I remediate CVE-2026-65639?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-65639, 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.

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