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CVE-2026-18885 – Unauthenticated Code Injection / RCE – ServiceNow AI Platform (Multiple Releases)

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Summary

CVE-2026-18885 is a critical code injection vulnerability in the GraphQL Composite Data API of the ServiceNow AI Platform (Now Platform) that allows an unauthenticated attacker to execute arbitrary code on the instance. Successful exploitation can result in unauthorized access to, or modification of, instance data beyond what was intended. The flaw carries a maximum CVSS score of 10.0 and was disclosed by ServiceNow on August 27, 2026 alongside three related critical/high-severity flaws (CVE-2026-18886, CVE-2026-74820, CVE-2026-6876).

Technical details

  • Root cause: Improper handling of input passed to the GraphQL Composite Data API allows injected code to be executed by the platform.
  • Trigger conditions: An attacker sends a crafted request to the GraphQL Composite Data API; no authentication or user interaction is required.
  • Attack vector: Network-based, exploitable remotely against any internet-exposed ServiceNow instance running an affected release.
  • Impact: Arbitrary code execution on the ServiceNow platform, with the ability to view or modify instance data outside the intended access scope.

Affected software

  • ServiceNow AI Platform (Now Platform), including:
    • Xanadu — versions before Patch 11 Hot Fix 7a
    • Yokohama — versions before Patch 12 Hot Fix 3b and before Patch 13 Hot Fix 4
    • Zurich — versions before Patch 7b Hot Fix 3 through Patch 12
    • Australia — versions before Patch 2 Hot Fix 3 through Patch 5

Severity

CVSS v4.0 Base Score: 10.0 (Critical)
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

Mitigation and recommended actions

  • Immediate: Apply the ServiceNow-provided security patches/hot fixes corresponding to your release family (Xanadu Patch 11 Hot Fix 7a or later; Yokohama Patch 12 Hot Fix 3b / Patch 13 Hot Fix 4 or later; Zurich Patch 7b Hot Fix 3 through Patch 12 or later; Australia Patch 2 Hot Fix 3 through Patch 5 or later).
  • ServiceNow has already deployed the fix to ServiceNow-hosted instances; self-hosted and partner-hosted customers must apply the update manually.
  • If immediate patching is not possible, restrict network exposure of the instance and monitor GraphQL Composite Data API traffic for anomalous or unauthenticated requests as an interim measure.
  • Confirm patch application via the ServiceNow instance’s release/patch version and monitor ServiceNow’s advisory for updates.

References

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