CVE-2026-86857

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: 0.2% (14th percentile of EPSS-scored CVEs). 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 mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 8.4Exploit: 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 authorization bypass security issue that was identified in the ServiceNow AI Platform. This security issue, if exploited, could enable an authenticated user to access data within the ServiceNow AI Platform that the user otherwise would not be entitled to access, potentially enabling further unintended access.

ServiceNow deployed an 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 v3
8.4
EG Score
8.4HIGHmedium confidence
EG Risk
38
EG Risk 38/100CISA SSVC

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%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.2%
EPSS %ILE
14th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 24, 2026

Last Modified

September 25, 2026

Advisory Details (1)

Auto-updated Sep 24, 2026
No patch confirmed yet.
generic

[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-2026-86857(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 26× in last 7d / 41× 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.

  1. 2026-10-04 03:28 UTCGHSA enrichment
  2. 2026-10-03 16:02 UTCEG score recompute
  3. 2026-10-03 16:02 UTCGHSA enrichment
  4. 2026-10-03 04:37 UTCEG score recompute
  5. 2026-10-03 04:36 UTCGHSA enrichment
  6. 2026-10-02 17:11 UTCGHSA enrichment
  7. 2026-10-02 05:44 UTCEG score recompute
  8. 2026-10-02 05:44 UTCGHSA enrichment
  9. 2026-10-01 19:50 UTCEPSS rescore
  10. 2026-10-01 18:18 UTCGHSA enrichment
  11. 2026-10-01 06:35 UTCGHSA enrichment
  12. 2026-09-30 19:09 UTCEG score recompute
  13. 2026-09-30 19:09 UTCGHSA enrichment
  14. 2026-09-30 15:04 UTCEPSS rescore
  15. 2026-09-30 07:43 UTCGHSA enrichment
  16. 2026-09-29 20:13 UTCEG score recompute
  17. 2026-09-29 20:13 UTCGHSA enrichment
  18. 2026-09-29 08:46 UTCEG score recompute
  19. 2026-09-29 08:46 UTCGHSA enrichment
  20. 2026-09-28 21:21 UTCEG score recompute
  21. 2026-09-28 21:21 UTCGHSA enrichment
  22. 2026-09-28 13:52 UTCEPSS rescore
  23. 2026-09-28 09:55 UTCGHSA enrichment
  24. 2026-09-27 22:30 UTCEG score recompute
  25. 2026-09-27 22:30 UTCGHSA enrichment
Show 16 more
  1. 2026-09-27 13:48 UTCEPSS rescore
  2. 2026-09-27 11:04 UTCGHSA enrichment
  3. 2026-09-26 23:39 UTCEG score recompute
  4. 2026-09-26 23:39 UTCGHSA enrichment
  5. 2026-09-26 15:59 UTCEPSS rescore
  6. 2026-09-26 12:12 UTCGHSA enrichment
  7. 2026-09-26 00:46 UTCEG score recompute
  8. 2026-09-26 00:46 UTCGHSA enrichment
  9. 2026-09-25 13:20 UTCEG score recompute
  10. 2026-09-25 13:20 UTCGHSA enrichment
  11. 2026-09-25 12:34 UTCEG score recompute
  12. 2026-09-25 12:34 UTCGHSA enrichment
  13. 2026-09-25 08:27 UTCGHSA enrichment
  14. 2026-09-24 19:35 UTCEG score recompute
  15. 2026-09-24 18:42 UTCEG score recompute
  16. 2026-09-24 18:41 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-86857?
CVE-2026-86857 is a high vulnerability published on September 24, 2026. ServiceNow has remediated an authorization bypass security issue that was identified in the ServiceNow AI Platform. This security issue, if exploited, could enable an authenticated user to access data within the ServiceNow AI Platform that the user otherwise would not be entitled to access,…
When was CVE-2026-86857 disclosed?
CVE-2026-86857 was first published on September 24, 2026, with the most recent update on September 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-86857 actively exploited?
CVE-2026-86857 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (14th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-86857?
CVE-2026-86857 has a CVSS base score of 8.4 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-86857?
No fix for CVE-2026-86857 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-2026-86857 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-86857

Explore →

Is Your Infrastructure Affected by CVE-2026-86857?

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