A vulnerability in the web-based management interface of Cisco Prime Infrastructure could allow an authenticated, remote attacker to conduct a stored cross-site scripting (XSS) attack against users of the interface of an affected system. This vulnerability exists because the web-based management interface does not properly validate user-supplied input. An attacker could exploit this vulnerability by inserting malicious code into specific data fields in the interface. A successful exploit could allow the attacker to execute arbitrary script code in the context of the affected interface or access sensitive, browser-based information. To exploit this vulnerability, an attacker must have valid administrative credentials.
The severity level of this vulnerability is classified as medium, with a CVSS score of 4.8. This means that while the potential for exploitation exists, it requires specific conditions to be met, particularly that the attacker must have administrative access. The risk to organizations includes potential unauthorized access to sensitive data and compromise of user sessions.
Organizations should prioritize patching immediately. Failure to address this vulnerability could lead to significant security breaches, particularly in environments where Cisco Prime Infrastructure is utilized for critical network management functions.
As of now, there are no known public exploits or proofs of concept available for CVE-2026-20111, which provides a temporary buffer for organizations to apply necessary updates.
Cisco has acknowledged this vulnerability and is likely to release patches. Organizations should monitor Cisco's official communications for updates.
Vulnerability Details
The vulnerability allows authenticated attackers to exploit the web-based management interface of Cisco Prime Infrastructure. The official CVE description states that it arises from improper validation of user-supplied input, enabling attackers to insert malicious code into the interface.
The CVSS score of 4.8 indicates a medium severity level. This score reflects the potential impact on confidentiality and integrity, both rated as low, while availability is marked as none. The attack vector is network-based, with low complexity; however, it requires high privileges and user interaction.
The affected product is Cisco Prime Infrastructure, specifically versions up to 3.9 and from 3.10 to 3.10.6. The vulnerability was published on February 4, 2026.
Technical Analysis
The root cause of this vulnerability is the insufficient validation of user input in the web management interface. Attackers can exploit this flaw by inserting malicious scripts that get executed within the context of the user's session.
The attack vector is through the network, requiring the attacker to have administrative credentials. The attack complexity is low, meaning that the exploit can be executed easily once access is gained. User interaction is required, as the attacker must entice a legitimate user to execute the crafted code.
The potential impacts include low confidentiality and integrity impact, as malicious scripts could access sensitive information or manipulate user sessions without affecting the overall availability of the system.
Risk & Impact Analysis
In real-world deployments, this vulnerability poses a substantial risk as it could allow unauthorized access to administrative functionalities within Cisco Prime Infrastructure. The potential blast radius includes any organization relying on this system for network management, making it critical to address promptly.
The urgency of remediation is heightened by the fact that the exploit requires administrative access, which can be a common scenario in many organizational setups. Organizations should prioritize this vulnerability in their patch management processes.
Given the CVSS score of 4.8 and the absence of known exploits, organizations are advised to plan for remediation in their next security cycle. The risk to organizations includes unauthorized access and potential data breaches.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The following versions of Cisco Prime Infrastructure are affected by this vulnerability:
1. All versions prior to 3.10.6, including 3.9.
Mitigation & Remediation
Organizations should implement the following actions to mitigate this vulnerability:
1. Upgrade to the latest version of Cisco Prime Infrastructure.
2. If an upgrade is not feasible, implement strict input validation and sanitization on all data fields in the management interface.
3. Limit administrative access to trusted personnel only.
4. Monitor and log all administrative activities for suspicious actions.
For further guidance on penetration testing and security assessments, organizations can refer to penetration testing services that can help validate and strengthen their defenses.
Detection Guidance
Organizations should monitor the following indicators to detect possible exploitation of this vulnerability:
1. Log entries indicating unusual access patterns to the management interface.
2. Behavioral anomalies in user sessions, particularly involving administrative accounts.
3. Network traffic patterns that indicate exploitation attempts, such as unexpected script execution.
AppSecure Threat Intelligence Insight
The long-term significance of this vulnerability highlights the ongoing risks associated with inadequate input validation in web applications. The trend in vulnerabilities related to XSS attacks underscores the need for robust security measures in web management interfaces.
Security teams should take this opportunity to review their security practices, focusing on input validation and the principle of least privilege to safeguard their systems.
For further insights on vulnerability trends and assessments, organizations can explore our resources on vulnerability management programs and related security practices.
Additionally, our approach to penetration testing can help organizations identify and mitigate similar vulnerabilities.
Ultimately, proactive security measures and continuous monitoring are essential to reduce the risk posed by vulnerabilities like CVE-2026-20111.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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