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major vulnerability· requires attention

Affects widely used enterprise SaaS (ServiceNow); improper access control allows unauthenticated data changes that can disrupt organizations.

Cloud

CVE-2026-86858

8.7
High
EPSS 0.28%Patch available

Improper access control in ServiceNow AI Platform allows unauthenticated data modification

exploited
No known exploitation not in CISA KEV as of our last sync
fix
Patch available see the advisory in the references
likelihood
EPSS 0.28%top 80% of scored CVEs
Published 24 Sept 2026Analysed here 25 Sept 2026CVSS scored by the publisher (CNA)
common questions

Is CVE-2026-86858 being exploited?

Not confirmed. CVE-2026-86858 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.28% probability of exploitation in the next 30 days.

How severe is CVE-2026-86858?

CVE-2026-86858 is rated High with a CVSS score of 8.7. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.

Is there a patch for CVE-2026-86858?

Yes. A fix has been recorded for CVE-2026-86858. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.

What does CVE-2026-86858 affect?

CVE-2026-86858 affects ServiceNow AI Platform, ServiceNow hosted instances, Self-hosted ServiceNow instances, ServiceNow partner deployments. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.

What should I do about CVE-2026-86858?

Apply ServiceNow security update or upgrade to the patched release immediately.

Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.

executive summary
technical analysis
affected
ServiceNow AI PlatformServiceNow hosted instancesSelf-hosted ServiceNow instancesServiceNow partner deployments
impact

Unauthenticated attacker can create, modify, or delete instance data remotely, leading to data corruption, exfiltration, or service disruption.

action required

Immediate action required

affected versions
ServiceNow ServiceNow AI Platform
  • affected< Yokohama Patch 13 Hot Fix 5a
  • affected< Zurich Patch 10 Hot Fix 3b
  • affected< Zurich Patch 10 Hot Fix 4a W32
  • affected< Zurich Patch 11 Hot Fix 3
  • affected< Australia Patch 2 Hot Fix 4b W32
  • affected< Australia Patch 4 Hot Fix 3
  • affected< Australia Patch 5

As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.

cisa ssvc

exploitation
none
automatable
yes
technical impact
partial

Assessed by CISA 24 Sept 2026 (SSVC 2.0.3).

timeline

  1. 24 Sept 2026Published
  2. 24 Sept 2026CISA SSVC assessment: exploitation none · same day later
  3. 24 Sept 2026CVE record last updated · same day later
  4. 25 Sept 2026Analysed by vulneraibility.com · 1 day later
how to fix
Remediation steps are tailored for users whose stack is affected. Add this technology to your stack to see the fix checklist.
references
NVDCVE.orgCVE DetailsSource
1 reference in the CVE record: 1 link

sources

  • CVE List (CVE.org): description, affected versions, references; CVE Terms of Use
  • NVD: CVSS and CPE data
  • CISA Vulnrichment (ADP): SSVC decision points
  • FIRST EPSS: exploit probability and percentile
  • Summary, impact and triage tags: written by our AI analysis pipeline from the sources above. Check them against the sources.
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