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CVE-2026-76460 — Cisco Identity Services Engine Authentication Bypass Vulnerability

CVE-2026-76460 · Cisco Identity Services Engine Software · CVSS 10 ·…

In brief

Severity · CVSS
Critical10CVSS 3.1, Critical
EPSS
14%
CISA KEV
Known exploited, listed since 16 Sept 2026
Vendor
Cisco
Published · Modified
·
Last verified

Summary

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.

Weakness: CWE-648

Title, description and the vendor's statements are quoted from the CVE record; a vendor's advisory is summarised in Patcharo's words, with a link.

Affected and fixed versions

Per product and release branch, as the vendor's CVE record and official advisory state them. A fixed release is shown only when a document names it: the vendor's, or CERT-FR's for Check Point, with its source.

10 branches with a published fixed release

Cisco Identity Services Engine Software

Source: cisco-sa-ISE-ABP-VNSW7Tn5CVE-2026-76460

  1. 3.5
    Affected versions3.5, 3.5 Patch 1, 3.5 Patch 2, 3.5 Patch 3
    First fixed release3.5 Patch 4
  2. 3.4
    Affected versions3.4, 3.4 Patch 1, 3.4 Patch 2, 3.4 Patch 3
    7 releases listed3.4, 3.4 Patch 1, 3.4 Patch 2, 3.4 Patch 3, 3.4 Patch 4, 3.4 Patch 5, 3.4 Patch 6
    First fixed release3.4 Patch 7
  3. 3.3
    Affected versions3.3 Patch 1, 3.3 Patch 2, 3.3 Patch 3, 3.3 Patch 4
    11 releases listed3.3 Patch 1, 3.3 Patch 2, 3.3 Patch 3, 3.3 Patch 4, 3.3 Patch 5, 3.3 Patch 6, 3.3 Patch 7, 3.3 Patch 8, 3.3 Patch 9, 3.3 Patch 10, 3.3 Patch 11
    First fixed release3.3 Patch 12
  4. 3.2
    Affected versions3.2 Patch 7, 3.2 Patch 8, 3.2 Patch 9, 3.2 Patch 10
    First fixed release3.2 Patch 11
  5. 3.1
    Affected versions3.1 Patch 8, 3.1 Patch 9, 3.1 Patch 10, 3.1 Patch 11
    First fixed release3.1 Patch 12

Cisco ISE Passive Identity Connector

Source: cisco-sa-ISE-ABP-VNSW7Tn5CVE-2026-76460

  1. 3.5
    Affected versions3.5
    First fixed release3.5 Patch 4
  2. 3.4
    Affected versions3.4
    First fixed release3.4 Patch 7
  3. 3.3
    Affected versions< 3.3 Patch 12
    First fixed release3.3 Patch 12
  4. 3.2
    Affected versions< 3.2 Patch 11
    First fixed release3.2 Patch 11
  5. 3.1
    Affected versions< 3.1 Patch 12
    First fixed release3.1 Patch 12

Remediation

Fix available

Vendor fix

  • Identity Services Engine Software 3.53.5 Patch 4
  • Identity Services Engine Software 3.43.4 Patch 7
  • Identity Services Engine Software 3.33.3 Patch 12
  • Identity Services Engine Software 3.23.2 Patch 11
  • Identity Services Engine Software 3.13.1 Patch 12
  • ISE Passive Identity Connector 3.53.5 Patch 4
  • ISE Passive Identity Connector 3.43.4 Patch 7
  • ISE Passive Identity Connector 3.33.3 Patch 12
  • ISE Passive Identity Connector 3.23.2 Patch 11
  • ISE Passive Identity Connector 3.13.1 Patch 12

Upgrade to a fixed release listed above for your branch, or to a later fixed release the vendor explicitly supports.

Cisco has released updates that fix this vulnerability; its advisory lists them.

SourceCisco Security Advisory cisco-sa-ISE-ABP-VNSW7Tn5

Mitigation (vendor)

Cisco describes a workaround or a mitigation in its advisory.

SourceCisco Security Advisory cisco-sa-ISE-ABP-VNSW7Tn5

CISA KEV 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).

Full CISA action

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 due date:

SourceCISA KEV

CERT-FR recommendation

Refer to the vendor's security bulletin to obtain patches (see Documentation section).

SourceCERTFR-2026-AVI-1197

Last verified 1 Oct 2026 at 09:31 UTC

Known exploitation

Added to CISA KEV on 16 Sept 2026

Federal remediation due date: 19 Sept 2026

The CISA required action is shown under Remediation.

14% probability of exploitation in the next 30 days (percentile 96%).

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

CERT-FR

1 document of the French national CERT (ANSSI) references this CVE.

Advisory (AVI)CERTFR-2026-AVI-1197Published 17 Sept 2026

Multiple vulnerabilities in Cisco products

Remote denial of serviceRemote arbitrary code executionData integrity breachSQL injection (SQLi)Not specified by the vendorSecurity policy bypassData confidentiality breachPrivilege escalation

Summary

Multiple vulnerabilities have been discovered in Cisco products. Some of them allow an attacker to cause remote arbitrary code execution, privilege escalation, and remote denial of service. Cisco indicates that the vulnerability CVE-2026-76460 is actively exploited.

Recommendation

Refer to the vendor's security bulletin to obtain patches (see Documentation section).

Official document on cert.ssi.gouv.frread by Patcharo 28 Sept 2026 at 20:03 UTCMachine translation of the French text published by CERT-FR; a text whose translation did not pass Patcharo's checks stays in French. Identifiers, versions and links are copied unchanged.

Timeline

  1. Added to CISA KEV
  2. Published by the source
  3. CISA remediation due date
  4. Source record last modified
  5. EPSS score computed
  6. Last verified by Patcharo

Official sources

References

Cisco · CISA Known Exploited Vulnerabilities · NVD · FIRST EPSS · Cisco Security Advisory cisco-sa-ISE-ABP-VNSW7Tn5

How Patcharo reads this

Affected and fixed releases come from the vendor's structured statements and are matched against exact versions; CVSS from NVD, exploitation from CISA KEV and the vendor's own advisory, probability from FIRST EPSS. Missing data stays Unknown and never becomes Not affected.

Read the methodologyRead the guide: Cisco Secure Firewall release trains: Threat Defense, Management Center and ASA versions explained