# CVE-2026-76499 — Cisco Application Policy Infrastructure Controller (APIC)

> As of 2026-10-07, CVE-2026-76499 is a CRITICAL-severity vulnerability in Cisco Application Policy Infrastructure Controller (APIC), CVSS v3.1 9.8, EPSS 0.3% (21.6th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-76499, 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-2026-76499?

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Application Policy Infrastructure Controller (APIC) engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-76499 are related to improper neutralization issues that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-707.

The record classifies CVE-2026-76499 under weakness class [CWE-707](https://intel.threadlinqs.com/cwe/CWE-707). 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 confidentiality, 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:** 9.8 — CRITICAL (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **EPSS (FIRST):** 0.3% probability of exploitation in the next 30 days, higher than 21.6% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 5.8/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-10-07

## Is CVE-2026-76499 being exploited?

It currently carries a trending score of 40 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [Cisco](https://intel.threadlinqs.com/vendors/cisco): Application Policy Infrastructure Controller (APIC)

## How to fix CVE-2026-76499

No vendor patch reference has been recorded for CVE-2026-76499 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-2026-76499

1 tracked threat in the Threadlinqs corpus references CVE-2026-76499, 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-hardening-apic-UOXWtfh)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-76499
Full detection coverage and IOCs for threats exploiting CVE-2026-76499 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp