CVE-2026-76460: Cisco Identity Services Engine

Should you act?

Exploited: patch now if you run it

CISA has confirmed exploitation in the wild. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.

Yes, if you run Cisco Identity Services Engine. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2026-09-16, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2026-09-19; treat that as the outer limit, not the target.
EPSS 14.0%, percentile 97: FIRST’s model estimates a 14.0% chance of exploitation activity in the next 30 days, higher than 97% of all scored CVEs (very high). EPSS is a probability, not a verdict.
Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
Editorial verdict: Act now. Cisco ISE CVE-2026-76460: Exploited CVSS 10 Auth Bypass — If you run Cisco ISE or ISE-PIC on any release before the fixed patches, patch now and hunt every node; the bug needs no login, is exploited, and Cisco warns attackers may get root and erase their tracks.

What it is

A vulnerability in an API of Cisco Identity Services Engine (ISE) could allow an unauthenticated, remote attacker to bypass authentication. This vulnerability is due to insufficient authentication control on an API endpoint. An attacker could exploit this vulnerability by sending a crafted request to an affected API endpoint. A successful exploit could allow the attacker to gain unauthorized access to the affected device by bypassing the web-based management interface.

CISA’s summary

Cisco Identity Services Engine (ISE) and Cisco ISE Passive Identity Connector (ISE-PIC) contain an incorrect use of privileged APIs vulnerability that could allow an unauthenticated, remote attacker to gain unauthorized access to the affected device by bypassing the web-based management interface.

Weakness type: CWE-648.

Product: Cisco Identity Services Engine · Assigned by: cisco · Published: 2026-09-16

Affected and fixed versions

Vendor	Product	Affected versions (per CVE record)
Cisco	Cisco Identity Services Engine Software	3.1.0 p8, 3.1.0 p9, 3.3 Patch 2, 3.3 Patch 1, 3.3 Patch 3, 3.4.0, 3.2.0 p7, 3.3 Patch 4, 3.4 Patch 1, 3.1.0 p10, 3.3 Patch 5, 3.3 Patch 6
Cisco	Cisco ISE Passive Identity Connector	3.4.0, 3.5.0

Severity scores

Scored by	CVSS	Score	Vector
cisco	3.1	10 Critical	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H`

Attack vector: network (remotely reachable)
Attack complexity: low
Privileges required: none (no login)
User interaction: none
Scope: changed (can affect other components)

CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.

Exploitation and urgency

CISA KEV: added 2026-09-16; federal due date 2026-09-19. Known ransomware use: Unknown.
CISA required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
CISA SSVC assessment: exploitation active, automatable yes, technical impact total.
FIRST EPSS (model of 2026-10-21): 14.03% probability of exploitation activity in the next 30 days; percentile 97.

Timeline

2026-09-16 — Added to CISA’s Known Exploited Vulnerabilities catalog
2026-09-16 — CVE record published by cisco
2026-09-16 — erroneo.us brief: Cisco ISE CVE-2026-76460: Exploited CVSS 10 Auth Bypass
2026-09-19 — CISA remediation deadline for US federal agencies
2026-10-07 — CVE record last updated

Sources and references

Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.