---
title: "CVE-2026-76454: Cisco License On-Prem - Unrestricted File Upload & Denial of Service"
description: "Cisco License On-Prem contains an unrestricted file write and denial of service vulnerability caused by improper input validation and lack of authentication in the Smart Licensing Utility API, letting unauthenticated remote attackers write arbitrary files or cause DoS, exploit requires no authentication."
url: https://panop.io/threat-heartbeat/CVE-2026-76454/
---

# CVE-2026-76454 Cisco License On-Prem - Unrestricted File Upload & Denial of Service

Cisco License On-Prem contains an unrestricted file write and denial of service vulnerability caused by improper input validation and lack of authentication in the Smart Licensing Utility API, letting unauthenticated remote attackers write arbitrary files or cause DoS, exploit requires no authentication.

CVSS base score 9.1 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.58% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-76454)

## Details

Type

Unrestricted File Upload

Impact

File System Write, Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Published

7 October 2026

Updated

15 October 2026

Weakness

[CWE-23](https://cwe.mitre.org/data/definitions/23.html)

## Vendor fix

Update to the latest available version with the vulnerability fixed.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-76454](https://nvd.nist.gov/vuln/detail/CVE-2026-76454)
- [https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ssm-access-nttb2dhE](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ssm-access-nttb2dhE)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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