Critical severity · published Sep 16, 2026
CVE-2026-76460
Cisco Identity Services Engine Authentication Bypass Vulnerability
In wildKEV
10.0
CVSS
75.6%
EPSS
Yes
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)75.6% · higher than 100% of CVEs
Exploited in the wildYes
CISA KEVListed Sep 16, 2026
Federal remediation dueSep 19, 2026
Ransomware campaign useNot known
Affected products
Which versions
CI
Cisco ISE Passive Identity Connector · Cisco
3.4.0; 3.5.0 · source: vendor
CI
Cisco Identity Services Engine Software · Cisco
3.1.0 p8; 3.1.0 p9; 3.3 Patch 2; 3.3 Patch 1; 3.3 Patch 3; 3.4.0; +24 more · source: vendor
IS
Identity Services Engine · Cisco
3.1.0; 3.1.0; 3.1.0; 3.1.0; 3.1.0; 3.1.0; +34 more · source: NVD, KEV
IS
Identity Services Engine Passive Identity Connector · Cisco
3.1.0; 3.1.0; 3.1.0; 3.1.0; 3.1.0; 3.1.0; +34 more · source: NVD
In the news
VulnerabilityCritical
Cisco Zero-Day Highlights API Endpoint Authentication Issues
The authentication bypass flaw CVE-2026-76460 impacts Cisco's Identity Services Engine (ISE) and received a maximum 10 out of 10 CVSS score.
Sep 18, 2026·Dark Reading
VulnerabilityHigh
Unauthenticated attackers are bypassing Cisco ISE’s management interface (CVE-2026-76460)
Two days after it warned customers about an actively exploited email gateway zero-day, Cisco confirmed one more flaw is being targeted: CVE-2026-76460, an authentication bypass bug in an API of Cisco Identity Services Engine (ISE). About CVE-2026-76460 Cisco ISE is an identity-based network access control and policy platform. It checks connecting users’ identity, profiles devices and checks their security posture, grants users the right type of access, and logs it all. “[CVE-2026-76460] is due to … More → The post Unauthenticated attackers are bypassing Cisco ISE’s management interface (CVE-2026-76460) appeared first on Help Net Security .
Sep 17, 2026·Help Net Security
VulnerabilityCritical
U.S. CISA adds Acronis Backup, Cisco ISE, and Google Pixel flaws to its Known Exploited Vulnerabilities catalog
U.S. Cybersecurity and Infrastructure Security Agency (CISA) adds Acronis Backup, Cisco ISE, and Google Pixel flaws to its Known Exploited Vulnerabilities catalog. The U.S. Cybersecurity and Infrastructure Security Agency (CISA) added [1, 2] the following vulnerabilities to its Known Exploited Vulnerabilities (KEV) catalog: CVE-2026-76460 is an authentication bypass vulnerability affecting an API in Cisco Identity Services Engine (ISE). The flaw […]
Sep 17, 2026·Security Affairs
VulnerabilityCritical
Cisco Warns of New Zero-Day ISE Auth Bypass (CVSS 10.0) Exploited in Active Attacks
Cisco has warned of a fresh maximum-severity security flaw impacting Identity Services Engine (ISE) that has come under active exploitation. The vulnerability, tracked as CVE-2026-76460 (CVSS score: 10.0), could allow an unauthenticated, remote attacker to bypass authentication. "This vulnerability is due to insufficient authentication control on an API endpoint," Cisco said. "An attacker
Sep 17, 2026·The Hacker News
AdvisoryHigh
CISA Adds Two Known Exploited Vulnerabilities to Catalog
CISA has added two new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog , based on evidence of active exploitation. CVE-2026-76460 Cisco Identity Services Engine Incorrect Use of Privileged APIs Vulnerability CVE-2026-87886 Acronis Backup Incorrect Default Permissions Vulnerability These types of vulnerabilities are a frequent attack vector for malicious cyber actors and pose significant risks to the federal enterprise.  Binding Operational Directive (BOD) 26-04: Prioritizing Security Updates Based on Risk establishes vulnerability management requirements for Federal Civilian Executive Branch (FCEB) agencies. BOD 26-04 reinforces the importance of the KEV Catalog and requires federal agencies to prioritize rapid remediation of high-risk vulnerabilities, specifically those identified by Common Vulnerabilities and Exposures (CVEs) listed in CISA’s KEV Catalog on publicly exposed assets that grant total control of the asset post-exploitation, while deferring action for lower-risk vulnerabilities. BOD 26-04 further establishes basic expectations for when agencies must check whether threat actors compromised the system before the patch was applied.  While BOD 26-04 applies only to FCEB agencies, CISA encourages all organizations to adopt risk-based vulnerability management and prioritize remediation of KEV Catalog vulnerabilities . CISA will continue to add vulnerabilities to the catalog that meet the specified criteria .  ...
Sep 16, 2026·CISA Advisories
VulnerabilityCritical
[CISA KEV] CVE-2026-76460: Cisco Identity Services Engine - Cisco Identity Services Engine Incorrect Use of Privileged APIs Vulnerability
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.
ISIdentity Services EngineCVE-2026-76460
Sep 16, 2026·CISA KEV
Affected product
CI
Cisco Identity Services Engine Software
Cisco
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