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CVE-2026-20342: Authorization Bypass Through User-Controlled Key in Cisco Cisco Secure Firewall Management Center (FMC)

0
High
VulnerabilityCVE-2026-20342cvecve-2026-20342
Published: 09/16/2026 (09/16/2026, 20:15:43 UTC)
Source: CVE Database V5
Vendor/Project: Cisco
Product: Cisco Secure Firewall Management Center (FMC)

Description

A vulnerability in a specific file download API of Cisco Secure FMC Software could allow an authenticated, remote attacker to download arbitrary files from an affected system. This vulnerability exists because user input is not being sanitized. An attacker could exploit this vulnerability by sending a crafted HTTPS request. A successful exploit could allow the attacker to download arbitrary files from the affected system. To exploit this vulnerability, the attacker must have valid credentials for a user account with at least the role of Security Analyst (read-only).

CVSS v3.1

Score 7.7high

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
None
Availability
None
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

Affected software

Cisco

Cisco Secure Firewall Management Center (FMC)

Affected versions
=7.0.0=7.0.0.1=7.0.1=7.0.1.1=7.0.2=7.2.0=7.0.2.1=7.0.3=7.2.0.1=7.0.4=7.2.1=7.0.5=7.3.0=7.2.2=7.3.1=7.2.3=7.2.3.1=7.2.4=7.0.6=7.2.4.1=7.2.5=7.3.1.1=7.4.0=7.0.6.1=7.2.5.1=7.4.1=7.2.6=7.4.1.1=7.0.6.2=7.2.7=7.2.5.2=7.3.1.2=7.2.8=7.6.0=7.4.2=7.2.8.1=7.0.6.3=7.4.2.1=7.2.9=7.0.7=7.7.0=7.4.2.2=7.2.10=7.6.1=7.4.2.3=7.0.8=7.6.2=7.7.10=7.2.10.1=7.0.8.1=7.6.2.1=7.2.10.2=7.7.10.1=7.4.2.4=7.4.3=7.6.3=7.7.11=7.6.4=10.0.0=7.4.4=7.4.5=7.0.9=7.2.11=7.7.12=7.6.5=7.4.6=10.0.1=7.4.7

AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 09/16/2026, 21:16:38 UTC

Technical Analysis

This vulnerability in Cisco Secure Firewall Management Center (FMC) arises from improper input sanitization in a file download API, which allows an authenticated remote attacker with at least Security Analyst privileges to bypass authorization controls and download arbitrary files from the affected system by sending a crafted HTTPS request. The vulnerability affects numerous specific versions of Cisco Secure FMC. The CVSS 3.1 base score is 7.7, reflecting network attack vector, low complexity, required privileges, no user interaction, and high confidentiality impact without integrity or availability impact.

Potential Impact

Successful exploitation allows an attacker with valid Security Analyst credentials to download arbitrary files from the affected system, potentially exposing sensitive information. The confidentiality impact is high, but integrity and availability are not affected. This could lead to information disclosure risks within the environment where Cisco Secure FMC is deployed.

Mitigation Recommendations

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict access to Cisco Secure FMC to trusted users only and monitor for unusual file download activity. Since the vulnerability requires authenticated access with at least Security Analyst role, reviewing and limiting user privileges can reduce risk.

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Technical Details

Data Version
5.2
Assigner Short Name
cisco
Date Reserved
2025-10-08T11:59:15.413Z
Cvss Version
3.1
State
PUBLISHED

Threat ID: 6aab006d55bf5e2cf5232022

Added to database: 09/16/2026, 20:47:41 UTC

Last enriched: 09/16/2026, 21:16:38 UTC

Last updated: 09/17/2026, 04:01:23 UTC

Views: 7

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