CVE-2026-20342: Authorization Bypass Through User-Controlled Key in Cisco Cisco Secure Firewall Management Center (FMC)
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).
AI Analysis
Technical Summary
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.
CVE-2026-20342: Authorization Bypass Through User-Controlled Key in Cisco 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
Affected software
Cisco
Cisco Secure Firewall Management Center (FMC)
AI-Powered Analysis
Machine-generated threat intelligence
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.
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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