Cisco APIC CVE-2026-76499

The attacker needs network reachability to the Cisco APIC (Application Policy Infrastructure Controller) - the fabric controller for Cisco ACI data-center deployments - and per the CVSS vector no authentication (PR:N) or user interaction (UI:N) is required. The description provides no specific feature, protocol, or non-default configuration prerequisite; it only states the issues are improper-neutralization (CWE-707) flaws found in internal review, so the exact triggering vector is not disclosed in the available data. Primary limiting factor is deployment exposure: APIC management/controller interfaces are typically on isolated or restricted out-of-band management networks, so real-world reachability for an unauthenticated remote attacker is usually constrained to insiders or attackers who have already pivoted into the management segment, substantially narrowing exploitability despite the AV:N rating.

The input assigns a CVSS 3.1 base score of 9.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H), indicating a network-reachable, low-complexity, unauthenticated flaw with full confidentiality, integrity, and availability impact - on paper this is a top-tier priority. However, every corroborating exploitation signal is absent or weak: no EPSS score is provided, the CVE is NOT in CISA KEV, and no public proof-of-concept is referenced, so there is no public exploit identified at time of analysis. The vulnerability was internally discovered by Cisco's own APIC engineering team during a proactive security review rather than found through observed attacks, which strongly suggests no active exploitation is occurring and reduces real-world urgency relative to the raw score. No SSVC decision data (exploitation/automatable/technical-impact) was supplied. A notable tension exists between the metadata tag 'Information Disclosure' and both the CVSS impact triad (C:H/I:H/A:H implies far more than disclosure) and CWE-707 (improper neutralization, an injection-class pillar) - verify the actual impact with Cisco, as the tag appears narrower than the assessed scope. Also note CVE-2026-76499 is described as an umbrella for MULTIPLE internally discovered issues, so the single 9.8 vector may represent the worst-case component rather than every bundled flaw. Net assessment: high theoretical severity on a sensitive management controller, but currently low observed-exploitation risk given internal discovery and no KEV/POC/EPSS evidence - patch on a prioritized-but-not-emergency timeline unless the APIC is internet- or untrusted-network-exposed.

An attacker with network access to the APIC management interface sends crafted input that exploits an improper-neutralization (CWE-707) flaw, requiring no authentication or user interaction per the CVSS vector (AV:N/PR:N/UI:N). Successful exploitation could compromise the fabric controller's data confidentiality and integrity and disrupt availability. No public exploit code is known, and the issues were found through Cisco's internal review rather than observed in the wild.