Affects widely used enterprise SaaS (ServiceNow); improper access control allows unauthenticated data changes that can disrupt organizations.
CVE-2026-86858
Improper access control in ServiceNow AI Platform allows unauthenticated data modification
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.
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.
Unauthenticated attacker can create, modify, or delete instance data remotely, leading to data corruption, exfiltration, or service disruption.
Immediate action required
- 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.