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CVE-2026-76413 – SSO Token Forgery / Administrator Account Takeover – Cisco Secure Firewall Manageme

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Summary

CVE-2026-76413 is a high-severity vulnerability in the Cisco Adaptive Security Device Manager (ASDM) single sign-on (SSO) handler within Cisco Secure Firewall Management Center (FMC) Software. Improper management of the ASDM SSO token allows an unauthenticated, remote attacker to forge a valid session token and log in as the ASDM administrator user. Cisco rates the issue 8.2 (High) on CVSS v3.1.

Technical details

  • Root cause: Improper restriction/management of the security token issued by the ASDM SSO handler (CWE-1259, Improper Restriction of Security Token Assignment), allowing a token to be forged rather than validated as issued by the legitimate identity source.
  • Trigger conditions: No authentication or user interaction is required; the attacker only needs network reachability to the FMC management interface where ASDM SSO is exposed.
  • Attack vector: Network (AV:N), low attack complexity (AC:L), no privileges (PR:N), no user interaction (UI:N).
  • Impact: A successful forged-token login grants the attacker administrator-level access to ASDM. By repeating the forgery, the attacker can also continuously invalidate legitimate administrator sessions, keeping real admins locked out indefinitely. The vulnerability does not affect confidentiality but has a low integrity and high availability impact per the CVSS vector.
  • Cisco PSIRT states it is not aware of public proof-of-concept code or malicious exploitation of this vulnerability at the time of disclosure.

Affected software

  • Cisco Secure Firewall Management Center (FMC) Software, releases spanning the 7.0.x, 7.2.x, 7.4.x, 7.6.x, 7.7.x, and 10.0.x branches, from 7.0.0 through 10.0.1.
  • Cisco ASA Software and Cisco Secure Firewall Threat Defense (FTD) Software are not affected — the vulnerability is specific to the ASDM SSO handler as implemented in FMC.

Severity

  • CVSS v3.1 Base Score: 8.2 (High)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

Mitigation and recommended actions

  • Immediate: Upgrade the affected Cisco Secure Firewall Management Center to a fixed release. Cisco advises using the Cisco Software Checker to identify the fixed release applicable to your specific FMC train, as fixes are distributed across the 7.0.x, 7.2.x, 7.4.x, 7.6.x, 7.7.x, and 10.0.x branches.
  • If no patch can be applied immediately: Cisco states there are no workarounds for this vulnerability; restrict and closely monitor network access to the FMC management/ASDM interface (e.g., limit exposure to trusted management networks only) until the upgrade can be completed.

References

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