# CVE-2026-76454 — Cisco License On-Prem

> As of 2026-10-07, CVE-2026-76454 is a CRITICAL-severity vulnerability in Cisco License On-Prem, CVSS v3.1 9.1, EPSS 0.5% (46.1th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-76454, most recently “Cisco October 2026 Security Advisories: Critical Flaws in Meraki, License (SSM) On-Prem, NX-OS, APIC and Finesse (CVE-2026-76464, CVE-2026-20328, CVE-2026-76485 and others)”.

**Last updated:** 2026-10-07

## What is CVE-2026-76454?

A vulnerability in the Cisco Smart Licensing Utility API of Cisco License On-Prem, formerly Cisco Smart Software Manager On-Prem (SSM On-Prem), could allow an unauthenticated, remote attacker to write arbitrary files to the system or cause a DoS condition on an affected application. This vulnerability is due to improper input validation and a lack of authentication in the management API. An attacker could exploit this vulnerability by sending a crafted request to the affected API. A successful exploit could allow the attacker to modify system files or cause a DoS condition.

The record classifies CVE-2026-76454 under weakness class [CWE-23](https://intel.threadlinqs.com/cwe/CWE-23). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 3 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 9.1 — CRITICAL (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H`)
- **EPSS (FIRST):** 0.5% probability of exploitation in the next 30 days, higher than 46.1% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 6.4/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-10-07

## Is CVE-2026-76454 being exploited?

It currently carries a trending score of 46 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [Cisco](https://intel.threadlinqs.com/vendors/cisco): License On-Prem

## How to fix CVE-2026-76454

No vendor patch reference has been recorded for CVE-2026-76454 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-76454

1 tracked threat in the Threadlinqs corpus references CVE-2026-76454, either in the campaign’s CVE list or as an indicator on the campaign record.

- [Cisco October 2026 Security Advisories: Critical Flaws in Meraki, License (SSM) On-Prem, NX-OS, APIC and Finesse (CVE-2026-76464, CVE-2026-20328, CVE-2026-76485 and others)](https://intel.threadlinqs.com/threat/TL-2026-3108) — CRITICAL · 2026-10-09

## Sources

Enriched from CVE.org, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on 2026-10-10.

**Other references**

- [sec.cloudapps.cisco.com](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ssm-access-nttb2dhE)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-76454
Full detection coverage and IOCs for threats exploiting CVE-2026-76454 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp