A vulnerability in the web-based management interface of Cisco Evolved Programmable Network Manager (EPNM) and Cisco Prime Infrastructure could allow an unauthenticated, remote attacker to redirect a user to a malicious web page. This vulnerability is due to improper input validation of the parameters in the HTTP request. An attacker could exploit this vulnerability by intercepting and modifying an HTTP request from a user. A successful exploit could allow the attacker to redirect the user to a malicious web page.
The severity level of this vulnerability is medium, with a CVSS score of 4.3. This score reflects the potential impact of an exploit, which could lead to unauthorized redirection of users to harmful websites. Organizations should prioritize patching immediately.
Risk to organizations includes potential data exposure and phishing attacks targeting users redirected to malicious sites. The impact on user trust and security can be significant, making it imperative for organizations to address this vulnerability promptly.
Currently, there is no confirmed public exploit available for this vulnerability, and it is not listed in the Known Exploited Vulnerabilities (KEV) database. However, organizations should remain vigilant and monitor for any developments related to this vulnerability.
Organizations should address this vulnerability in their priority patch cycle to mitigate risks effectively.
Vulnerability Details
This vulnerability allows an attacker to redirect a user to a malicious web page via improper input validation in the management interface of Cisco EPNM and Prime Infrastructure. The CVSS score of 4.3 indicates a medium severity level, suggesting that while the impact is not critical, it requires prompt attention.
The affected products include Cisco EPNM and Cisco Prime Infrastructure, with specific versions outlined in the configurations section. The publication date of this vulnerability was February 4, 2026, officially classified under CWE-601.
Technical Analysis
The root cause of this vulnerability lies in the improper validation of input parameters in HTTP requests. Attackers can exploit this flaw by intercepting legitimate HTTP requests and altering them to redirect users to malicious sites. The attack vector is network-based, and the complexity is low, meaning an attacker does not require advanced skills to exploit this vulnerability.
No privileges are required for the attack, and user interaction is necessary, as users must click on a link to be redirected. The integrity impact is classified as low, primarily affecting the user's browsing experience without significant disruption to system availability.
Risk & Impact Analysis
The real-world risk posed by this vulnerability includes potential phishing attacks where users could be led to malicious websites designed to harvest credentials or distribute malware. Organizations utilizing Cisco EPNM and Prime Infrastructure should be particularly wary, as the blast radius could encompass all users accessing the management interface.
Given the CVSS score of 4.3, organizations should assess the urgency of remediation in their patch cycles. Although not critical, the potential for exploitation in a networked environment necessitates timely action to secure affected systems.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The specific affected versions for this vulnerability include Cisco EPNM versions prior to 8.1.1 and Cisco Prime Infrastructure versions up to 3.9, as well as versions 3.10.0 to 3.10.6.
Mitigation & Remediation
To mitigate this vulnerability, organizations should apply the latest patches provided by Cisco for EPNM and Prime Infrastructure. For those unable to patch immediately, it is advisable to implement network controls to restrict access to the management interfaces and monitor for unusual activity.
For more comprehensive guidance, organizations can refer to the penetration testing methodology and ensure all configurations are hardened.
Detection Guidance
To detect potential exploitation attempts, organizations should monitor logs for unusual HTTP request patterns and validate user interactions with management interfaces. Behavioral anomalies that deviate from normal patterns should be flagged for investigation.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2026-20123 highlights the ongoing need for robust input validation in web applications. As more organizations rely on remote management interfaces, the potential for similar vulnerabilities to arise increases. Security teams should focus on implementing effective input validation checks to mitigate risks associated with redirection vulnerabilities.
For deeper insights into security practices, organizations can refer to our guide on security testing best practices and consider an offensive security testing approach to uncover potential vulnerabilities in their systems.
Lastly, organizations should stay updated on trends in vulnerabilities and threats to maintain a proactive security posture, as highlighted in our vulnerability management program design.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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