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CVE-2026-76413

Cisco Secure Firewall Management Center Software Single Sign-On Token Forgery of Administrator Account Vulnerability

Published: Sep 16, 2026Updated: Sep 18, 2026 Sources: CVE List NVDCWE-1259
8.2HIGH
NVD MITRE
EPSS Score
0.3%
Top 74.6%
CISA KEV
Not in KEV
Exploits
0 Known
Remediation
No Fix Available
Self-Check
Not available

Description

A vulnerability in Cisco Adaptive Security Device Manager (ASDM) single sign-on (SSO) handler for Cisco Secure FMC Software could allow an unauthenticated, remote attacker to log in as the Cisco ASDM administrator user. This vulnerability is due to improper management of the Cisco ASDM SSO token. An attacker could exploit this vulnerability by performing session token forgery techniques. A successful exploit could allow the attacker to log in as the administrator user and, by repeating this action, keep legitimate administrators locked out of the ASDM indefinitely.

In plain language

AI Act now

A public exploit can let outsiders impersonate an administrator in Cisco Secure Firewall Management Center, so businesses that run it should treat this as urgent.

Executive summary

Unauthenticated remote administrator impersonation through forged Cisco ASDM single sign-on tokens in Cisco Secure Firewall Management Center Software.

If affected, business impact
Administrator account takeoverFirewall-management lockoutSecurity policy disruptionOperational disruption

What to do now

  1. Check whether your organization runs Cisco Secure Firewall Management Center and uses Cisco ASDM single sign-on.
  2. Restrict access to the management interface to trusted administrator networks while you investigate.
  3. Ask Cisco or your support provider for the fixed release; no patch or fixed version information is currently available.
  4. Review management-interface logins for unexpected administrator sessions and investigate any unexplained lockouts.
May need vendor / contractor work

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:LA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:HAvailability
High
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Weaknesses

CWE-1259

Affected Products

Cisco
commercial·USaka cisco systems, cisco systems inc.
Cisco Secure Firewall Management Center (FMC)
Networking Infrastructure

Exploitability

0 exploit sources identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Is your org exposed to CVE-2026-76413?Request an assessment to establish which checks are appropriate for your systems. Check my exposure

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc2-multivulns-HXgcqRG
sec.cloudapps.cisco.com
News mentions
1

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