CVE-2026-24423

CRITICALNVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score elevated to 9.8 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2026-02-05), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 9.8 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
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: 88%CVSS: 9.8Exploit: cisa kev · ssvc active · kev ransomware · 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.

SmarterTools SmarterMail versions prior to build 9511 contain an unauthenticated remote code execution vulnerability in the ConnectToHub API method. The attacker could point the SmarterMail to the malicious HTTP server, which serves the malicious OS command. This command will be executed by the vulnerable application.

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
88%
EPSS %ILE
100%
KEV
⚠ Exploited

Published

January 23, 2026

Last Modified

August 4, 2026

Advisory Details (4)

Auto-updated Sep 15, 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-2026-24423
generic

SmarterTools SmarterMail < Build 9511 Unauthenticated RCE via ConnectToHub API | Advisories | VulnCheck

https://www.vulncheck.com/advisories/smartertools-smartermail-unauthenticated-rce-via-connecttohub-api
generic

SmarterMail Additions, Changes and Fixes

https://www.smartertools.com/smartermail/release-notes/current
generic

CODE WHITE | Red Teaming & Attack Surface Management

https://code-white.com/public-vulnerability-list/#systemadminsettingscontrollerconnecttohub-missing-authentication-in-smartermail

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 49× in last 7d / 217× 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 791 total refreshes for this CVE.

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

Publicly available exploits

(2 references)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCaavamin/CVE-2026-24423
    First seen Jan 29, 2026

    CVE-2026-24423 exp

    Open source ↗
  • Nucleihttp/cves/2026/CVE-2026-24423.yaml
    First seen Jan 1, 2026

    SmarterMail - Remote Code Execution

    Open source ↗

Related CVEs(same CWE)

Frequently asked(6)

What is CVE-2026-24423?
CVE-2026-24423 is a critical vulnerability published on January 23, 2026. SmarterTools SmarterMail versions prior to build 9511 contain an unauthenticated remote code execution vulnerability in the ConnectToHub API method. The attacker could point the SmarterMail to the malicious HTTP server, which serves the malicious OS command. This command will be executed by the…
When was CVE-2026-24423 disclosed?
CVE-2026-24423 was first published in the National Vulnerability Database on January 23, 2026, with the most recent update on August 4, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-24423 actively exploited?
Yes. CISA added CVE-2026-24423 to the Known Exploited Vulnerabilities catalog on February 5, 2026, affecting SmarterTools SmarterMail. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2026-24423?
CVE-2026-24423 has a CVSS v3 base score of 9.8 (NVD).
Which products are affected by CVE-2026-24423?
CVE-2026-24423 affects SmarterTools SmarterMail. 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-2026-24423?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-24423, 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-2026-24423

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