---
title: "CVE-2026-76413: Cisco Adaptive Security Device Manager - Authentication Bypass"
description: "Cisco Adaptive Security Device Manager (ASDM) for Cisco Secure FMC Software contains an authentication bypass caused by improper management of the ASDM SSO token, letting unauthenticated remote attackers log in as administrator, exploit requires session token forgery."
url: https://panop.io/threat-heartbeat/CVE-2026-76413/
---

# CVE-2026-76413 Cisco Adaptive Security Device Manager - Authentication Bypass

Cisco Adaptive Security Device Manager (ASDM) for Cisco Secure FMC Software contains an authentication bypass caused by improper management of the ASDM SSO token, letting unauthenticated remote attackers log in as administrator, exploit requires session token forgery.

CVSS base score 8.2 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.46% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-76413)

## Details

Type

Authentication Bypass

Impact

Broken Authentication, Denial Of Service

CVSS vector

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

Published

16 September 2026

Updated

15 October 2026

Weakness

[CWE-1259](https://cwe.mitre.org/data/definitions/1259.html)

## Vendor fix

Update to the latest version with the fix for ASDM SSO token management.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-76413](https://nvd.nist.gov/vuln/detail/CVE-2026-76413)
- [https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc2-multivulns-HXgcqRG](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc2-multivulns-HXgcqRG)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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