CVE-2026-11858

HIGHPre-NVD 8.48.4—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.4 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.1%, top 97% 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
8.4EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.4Exploit: None knownExposed: 0

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

Quanos SCHEMA ST4 on-premises contains a local privilege escalation vulnerability in the Client Update Service. The update service runs as NT AUTHORITY\SYSTEM and exposes a .NET Remoting interface over a named pipe without sufficient access controls or authorization. A local authenticated low-privileged user can connect to the interface and invoke privileged update methods such as Update(). This allows arbitrary file write and delete operations with SYSTEM privileges and can be used to achieve local privilege escalation.

CVSS v3
8.4
EG Score
8.4(medium)
EG Risk
42(Track)
EG Risk 42/100SSVC: 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
Severity84% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
3%
KEV
Not listed

Published

June 17, 2026

Last Modified

June 17, 2026

Advisory Details (1)

Auto-updated Jun 18, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

Multiple Vulnerabilities in Quanos Content Solutions SCHEMA ST4 - SEC Consult

https://r.sec-consult.com/quanos

Vendor Advisories for CVE-2026-11858(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 17× in last 7d / 66× 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 110 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-11858?
CVE-2026-11858 is a high vulnerability published on June 17, 2026. Quanos SCHEMA ST4 on-premises contains a local privilege escalation vulnerability in the Client Update Service. The update service runs as NT AUTHORITY\SYSTEM and exposes a .NET Remoting interface over a named pipe without sufficient access controls or authorization. A local authenticated…
When was CVE-2026-11858 disclosed?
CVE-2026-11858 was first published in the National Vulnerability Database on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-11858 actively exploited?
CVE-2026-11858 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 97.3% of all scored CVEs.
What is the CVSS score of CVE-2026-11858?
CVE-2026-11858 has a CVSS v3 base score of 8.4 (NVD).
How do I remediate CVE-2026-11858?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-11858, 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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