CVE-2026-86858

HIGHPre-NVD 8.78.7
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This high-severity CVE scores 8.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3% (21st percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source

Also known asEUVD-2026-86395 (ENISA EUVD) · GHSA-g4fh-c3m5-g3pg (GitHub Security Advisories)Source: ENISA EUVD

8.7EG
EchelonGraph verdictPlan mitigationNo fix is confirmed yet: check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 8.7Exploit: None knownExposed services: Not assessed

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

ServiceNow has remediated an improper access control security issue that was identified in the ServiceNow AI Platform. This security issue could enable an unauthenticated user, in certain circumstances, to create, modify, or delete instance data beyond what was intended.

In August 2026, ServiceNow deployed a security update to hosted instances and ServiceNow provided the update to our partners and self-hosted customers. We are not currently aware of malicious exploitation against ServiceNow instances. We recommend customers promptly apply appropriate updates or upgrade to a patched release if they have not already done so.

CVSS
8.7
EG Score
8.7HIGHmedium confidence
EG Risk
54
EG Risk 54/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity87% × 45%
Impact severity (EG Severity): CVSS 8.7 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.3% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: No fix is confirmed yet. Check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high.
EPSS PROB
0.3%
EPSS %ILE
21st
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (8.7): severity, escalated by confirmed exploitation. This CVE's 8.7 is its impact severity (EG Severity), not escalated.

EG Severity
8.7 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source
EG Likelihood
0.3% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-09). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days if it is not.No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

No fix is confirmed yet. Check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; 60 days if it is not.

No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

September 24, 2026

Last Modified

September 24, 2026

Advisory Details (1)

Auto-updated Sep 24, 2026
No fix on record yet.
Web page

[Security Advisory] September 2026 CVE Advisory Notification - Security - Now Support Portal

https://support.servicenow.com/kb?id=kb_article_view&sysparm_article=KB3159623

Vendor Advisories for CVE-2026-86858(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 8× in last 7d / 33× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed its CVE.org record (CNA or CISA ADP). An arrow marks a change the record states ("CVSS → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

Showing the most recent 100 of 115 rows on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 15 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-13 16:58 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  2. 2026-11-12 16:34 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  3. 2026-11-11 16:41 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  4. 2026-11-10 16:45 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  5. 2026-11-10 15:45 UTCEchelonGraph re-scored
  6. 2026-11-10 15:45 UTCGHSA enrichmentGHSA-g4fh-c3m5-g3pg · GitHub severity HIGH
  7. 2026-11-09 16:36 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  8. 2026-11-08 16:41 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  9. 2026-11-07 16:40 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  10. 2026-11-06 16:39 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  11. 2026-11-05 16:39 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  12. 2026-11-04 16:37 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  13. 2026-11-03 18:17 UTCEchelonGraph re-scored
  14. 2026-11-03 18:17 UTCGHSA enrichmentGHSA-g4fh-c3m5-g3pg · GitHub severity HIGH
  15. 2026-11-03 16:49 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  16. 2026-11-02 16:46 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  17. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  18. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  19. 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  20. 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  21. 2026-10-27 19:34 UTCEchelonGraph re-scored
  22. 2026-10-27 19:34 UTCGHSA enrichmentGHSA-g4fh-c3m5-g3pg · GitHub severity HIGH
  23. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  24. 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  25. 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.3% · 20th percentile
Show 75 more
  1. 2026-10-25 13:54 UTCEchelonGraph re-scored
  2. 2026-10-24 16:34 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  3. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  4. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  5. 2026-10-21 16:34 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  6. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  7. 2026-10-20 07:24 UTCEchelonGraph re-scored
  8. 2026-10-20 07:23 UTCGHSA enrichmentGHSA-g4fh-c3m5-g3pg · GitHub severity HIGH
  9. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  10. 2026-10-18 16:33 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  11. 2026-10-18 03:04 UTCEchelonGraph re-scored
  12. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  13. 2026-10-16 16:44 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  14. 2026-10-15 16:33 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  15. 2026-10-14 16:34 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  16. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  17. 2026-10-13 05:16 UTCEchelonGraph re-scored
  18. 2026-10-13 05:16 UTCGHSA enrichmentGHSA-g4fh-c3m5-g3pg · GitHub severity HIGH
  19. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  20. 2026-10-12 14:51 UTCEchelonGraph re-scored
  21. 2026-10-12 01:30 UTCGHSA enrichmentGHSA-g4fh-c3m5-g3pg · GitHub severity HIGH
  22. 2026-10-11 19:16 UTCEchelonGraph re-scored
  23. 2026-10-11 16:33 UTCEchelonGraph re-scored
  24. 2026-10-11 13:50 UTCEchelonGraph re-scored
  25. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  26. 2026-10-11 12:36 UTCEchelonGraph re-scored
  27. 2026-10-11 12:36 UTCGHSA enrichmentGHSA-g4fh-c3m5-g3pg · GitHub severity HIGH
  28. 2026-10-10 23:41 UTCEchelonGraph re-scored
  29. 2026-10-10 23:41 UTCGHSA enrichmentGHSA-g4fh-c3m5-g3pg · GitHub severity HIGH
  30. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  31. 2026-10-10 10:42 UTCGHSA enrichmentGHSA-g4fh-c3m5-g3pg · GitHub severity HIGH
  32. 2026-10-09 21:49 UTCEchelonGraph re-scored
  33. 2026-10-09 21:49 UTCGHSA enrichmentGHSA-g4fh-c3m5-g3pg · GitHub severity HIGH
  34. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  35. 2026-10-09 08:59 UTCGHSA enrichmentGHSA-g4fh-c3m5-g3pg · GitHub severity HIGH
  36. 2026-10-08 20:08 UTCEchelonGraph re-scored
  37. 2026-10-08 20:08 UTCGHSA enrichmentGHSA-g4fh-c3m5-g3pg · GitHub severity HIGH
  38. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  39. 2026-10-08 06:33 UTCEchelonGraph re-scored
  40. 2026-10-08 06:33 UTCGHSA enrichmentGHSA-g4fh-c3m5-g3pg · GitHub severity HIGH
  41. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  42. 2026-10-07 17:42 UTCGHSA enrichmentGHSA-g4fh-c3m5-g3pg · GitHub severity HIGH
  43. 2026-10-07 04:47 UTCGHSA enrichmentGHSA-g4fh-c3m5-g3pg · GitHub severity HIGH
  44. 2026-10-06 15:57 UTCEchelonGraph re-scored
  45. 2026-10-06 15:57 UTCGHSA enrichmentGHSA-g4fh-c3m5-g3pg · GitHub severity HIGH
  46. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  47. 2026-10-06 03:07 UTCEchelonGraph re-scored
  48. 2026-10-06 03:07 UTCGHSA enrichmentGHSA-g4fh-c3m5-g3pg · GitHub severity HIGH
  49. 2026-10-05 17:44 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  50. 2026-10-05 14:18 UTCGHSA enrichmentGHSA-g4fh-c3m5-g3pg · GitHub severity HIGH
  51. 2026-10-05 01:28 UTCEchelonGraph re-scored
  52. 2026-10-05 01:28 UTCGHSA enrichmentGHSA-g4fh-c3m5-g3pg · GitHub severity HIGH
  53. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  54. 2026-10-04 12:39 UTCGHSA enrichmentGHSA-g4fh-c3m5-g3pg · GitHub severity HIGH
  55. 2026-10-03 23:50 UTCEchelonGraph re-scored
  56. 2026-10-03 23:49 UTCGHSA enrichmentGHSA-g4fh-c3m5-g3pg · GitHub severity HIGH
  57. 2026-10-03 11:00 UTCGHSA enrichmentGHSA-g4fh-c3m5-g3pg · GitHub severity HIGH
  58. 2026-10-02 22:10 UTCEchelonGraph re-scored
  59. 2026-10-02 22:10 UTCGHSA enrichmentGHSA-g4fh-c3m5-g3pg · GitHub severity HIGH
  60. 2026-10-02 09:20 UTCGHSA enrichmentGHSA-g4fh-c3m5-g3pg · GitHub severity HIGH
  61. 2026-10-01 20:30 UTCEchelonGraph re-scored
  62. 2026-10-01 20:30 UTCGHSA enrichmentGHSA-g4fh-c3m5-g3pg · GitHub severity HIGH
  63. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  64. 2026-10-01 07:37 UTCGHSA enrichmentGHSA-g4fh-c3m5-g3pg · GitHub severity HIGH
  65. 2026-09-30 18:48 UTCEchelonGraph re-scored
  66. 2026-09-30 18:48 UTCGHSA enrichmentGHSA-g4fh-c3m5-g3pg · GitHub severity HIGH
  67. 2026-09-30 15:04 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  68. 2026-09-30 05:37 UTCGHSA enrichmentGHSA-g4fh-c3m5-g3pg · GitHub severity HIGH
  69. 2026-09-29 16:46 UTCEchelonGraph re-scored
  70. 2026-09-29 16:46 UTCGHSA enrichmentGHSA-g4fh-c3m5-g3pg · GitHub severity HIGH
  71. 2026-09-29 03:42 UTCEchelonGraph re-scored
  72. 2026-09-29 03:42 UTCGHSA enrichmentGHSA-g4fh-c3m5-g3pg · GitHub severity HIGH
  73. 2026-09-28 14:52 UTCEchelonGraph re-scored
  74. 2026-09-28 14:52 UTCGHSA enrichmentGHSA-g4fh-c3m5-g3pg · GitHub severity HIGH
  75. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.3% · 17th percentile

Frequently asked(5)

What is CVE-2026-86858?
CVE-2026-86858 is a high-severity vulnerability; its CVE record was published on September 24, 2026. ServiceNow has remediated an improper access control security issue that was identified in the ServiceNow AI Platform. This security issue could enable an unauthenticated user, in certain circumstances, to create, modify, or delete instance data beyond what was intended. In August 2026, ServiceNow…
When was the CVE record for CVE-2026-86858 published?
The CVE record for CVE-2026-86858 was published on September 24, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 24, 2026; the record at its source may have been updated since.
Is CVE-2026-86858 actively exploited?
CVE-2026-86858 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (21st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-86858?
CVE-2026-86858 has a CVSS base score of 8.7 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-86858?
No fix for CVE-2026-86858 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-86858 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-86858

Explore →

Is Your Infrastructure Affected by CVE-2026-86858?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.