CVE-2026-20282: Improper Restriction of Names for Files and Other Resources in Cisco Cisco Identity Services Engine Software
A vulnerability in Cisco ISE could allow an authenticated, remote attacker to obtain write access on the underlying operating system of an affected device. This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected device. A successful exploit could allow the attacker to obtain write access to the underlying operating system. To exploit this vulnerability, the attacker must have valid administrative credentials. Note: For CVE-2026-20282, Cisco has assigned a Security Impact Rating (SIR) of High rather than Medium as the score indicates. The reason is that it is easy to get to root from the achieved privilege level.
AI Analysis
Technical Summary
This vulnerability in Cisco ISE Software affects versions 3.1.0, 3.2.0, 3.3.0, 3.4.0, and 3.5.0. It is caused by improper restriction of names for files and other resources, leading to insufficient validation of user input. An attacker with valid administrative credentials can exploit this by sending a crafted HTTP request to gain write access on the underlying operating system. Cisco assigned a Security Impact Rating of High because the privilege gained can be easily escalated to root. The CVSS 3.1 vector is AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N, indicating network attack vector, low attack complexity, high privileges required, no user interaction, unchanged scope, no confidentiality impact, high integrity impact, and no availability impact.
Potential Impact
An authenticated attacker with administrative privileges can exploit this vulnerability to gain write access to the underlying operating system of the affected Cisco ISE device. This write access can be escalated to root privileges, potentially allowing full control over the system. There is no direct confidentiality or availability impact reported, but the integrity of the system is severely affected.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since the vulnerability requires valid administrative credentials, ensure that administrative access is tightly controlled and monitored. Follow Cisco's official advisories for updates and apply any provided patches or workarounds as soon as they become available.
CVE-2026-20282: Improper Restriction of Names for Files and Other Resources in Cisco Cisco Identity Services Engine Software
Description
A vulnerability in Cisco ISE could allow an authenticated, remote attacker to obtain write access on the underlying operating system of an affected device. This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected device. A successful exploit could allow the attacker to obtain write access to the underlying operating system. To exploit this vulnerability, the attacker must have valid administrative credentials. Note: For CVE-2026-20282, Cisco has assigned a Security Impact Rating (SIR) of High rather than Medium as the score indicates. The reason is that it is easy to get to root from the achieved privilege level.
CVSS v3.1
Score 4.9medium
Affected software
Cisco
Cisco Identity Services Engine Software
pkg:github/cisco/identity-services-engineRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in Cisco ISE Software affects versions 3.1.0, 3.2.0, 3.3.0, 3.4.0, and 3.5.0. It is caused by improper restriction of names for files and other resources, leading to insufficient validation of user input. An attacker with valid administrative credentials can exploit this by sending a crafted HTTP request to gain write access on the underlying operating system. Cisco assigned a Security Impact Rating of High because the privilege gained can be easily escalated to root. The CVSS 3.1 vector is AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N, indicating network attack vector, low attack complexity, high privileges required, no user interaction, unchanged scope, no confidentiality impact, high integrity impact, and no availability impact.
Potential Impact
An authenticated attacker with administrative privileges can exploit this vulnerability to gain write access to the underlying operating system of the affected Cisco ISE device. This write access can be escalated to root privileges, potentially allowing full control over the system. There is no direct confidentiality or availability impact reported, but the integrity of the system is severely affected.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since the vulnerability requires valid administrative credentials, ensure that administrative access is tightly controlled and monitored. Follow Cisco's official advisories for updates and apply any provided patches or workarounds as soon as they become available.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- cisco
- Date Reserved
- 2025-10-08T11:59:15.403Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6aab006855bf5e2cf523200b
Added to database: 09/16/2026, 20:47:36 UTC
Last enriched: 09/16/2026, 21:18:53 UTC
Last updated: 09/17/2026, 00:01:26 UTC
Views: 4
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