EUVD-2026-90271Severity by source
AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Network-reachable admin console with low complexity but requires System Administrator privileges (PR:H); SSTI-to-OS-command yields full C/I/A on the appliance with no scope change.
Primary rating from Vendor (cisa-cg).
CVSS VectorVendor: cisa-cg
Lifecycle Timeline
6DescriptionCVE.org
A system notification template on the Kiteworks appliance was rendered by a template engine that evaluated expressions contained in the stored template body. An authenticated System Administrator could potentially store a crafted template that executed operating-system commands on the appliance when the notification was next sent.
AnalysisAI
Server-side template injection in the Kiteworks Core appliance allows an authenticated System Administrator to store a crafted system-notification template whose embedded template-engine expressions are evaluated when the notification is next rendered, resulting in operating-system command execution on the appliance. Exploitation requires a high-privileged admin account (CVSS vector PR:H, UI:N) and has a timing dependency because the payload only fires when the affected notification is triggered, making this a malicious-insider or compromised-admin scenario rather than a perimeter-reachable RCE. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires an authenticated System Administrator account on the Kiteworks appliance (PR:H) with the ability to edit a system notification template; the crafted template body must contain template-engine expressions, and execution is deferred until that notification is next sent/rendered by the appliance. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor-assigned CVSS 3.1 vector (7.2, AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H) is well-supported by the description: server-side template injection (CWE-1336) in a stored system-notification template lets a System Administrator achieve OS command execution on the appliance, which legitimately maps to full C:H/I:H/A:H. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | No vendor-released patch was identified at time of analysis, so remediation currently depends on hardening and detection rather than upgrading; monitor the vendor advisory GHSA-gmgg-7xhc-75f9 (https://github.com/kiteworks/security-advisories/security/advisories/GHSA-gmgg-7xhc-75f9) and the CISA CSAF record VA-26-274-01 for a patched release and apply it as soon as it is published. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, restrict access to the Kiteworks Core System Administrator role to only essential personnel, enable detailed audit logging for all template and notification configuration changes, review existing system-notification templates for unexpected expressions, and confirm that backups and recovery procedures are current; also open a case with Kiteworks support to request mitigation guidance since no vendor-released patch identified at time of analysis. …
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