CVE-2025-6235: CWE-79 Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') in Extreme Networks ExtremeControl
In ExtremeControl before 25.5.12, a cross-site scripting (XSS) vulnerability was discovered in a login interface of the affected application. The issue stems from improper handling of user-supplied input within HTML attributes, allowing an attacker to inject script code that may execute in a user's browser under specific interaction conditions. Successful exploitation could lead to exposure of user data or unauthorized actions within the browser context.
AI Analysis
Technical Summary
CVE-2025-6235 is a cross-site scripting (XSS) vulnerability identified in Extreme Networks' ExtremeControl product, specifically affecting versions prior to 25.5.12, including version 25.2.12. The vulnerability arises from improper neutralization of user-supplied input within HTML attributes on the login interface. This improper handling allows an attacker to inject malicious script code that executes in the context of a victim's browser when the user interacts with the affected interface. The vulnerability is classified under CWE-79, which pertains to improper input sanitization during web page generation. Exploitation does not require authentication or privileges and can be triggered remotely over the network. The CVSS v4.0 base score is 5.3 (medium severity), reflecting that the attack vector is network-based, with low complexity, no privileges required, but requires user interaction. The impact includes potential exposure of sensitive user data and unauthorized actions performed within the victim's browser session, such as session hijacking, credential theft, or unauthorized commands executed on behalf of the user. No known exploits are currently reported in the wild, and no patches or mitigation links have been published at the time of this report. The vulnerability affects the login interface, a critical entry point, increasing the risk of successful exploitation if users access the vulnerable version of ExtremeControl. Given the nature of XSS, the attack scope is limited to the browser context of users interacting with the vulnerable interface, but the consequences can be significant in environments where ExtremeControl manages network access and security policies.
Potential Impact
For European organizations, the impact of CVE-2025-6235 can be considerable, especially for enterprises and service providers relying on ExtremeControl for network access control and policy enforcement. Successful exploitation could lead to unauthorized access to user sessions, leakage of sensitive authentication tokens, or manipulation of user actions within the management interface. This could compromise network security posture, potentially allowing attackers to pivot within the network or disrupt normal operations. Given that ExtremeControl is often deployed in environments requiring strict access control, such as universities, enterprises, and public sector networks, the vulnerability could undermine trust in network security mechanisms. Additionally, GDPR considerations heighten the risk profile, as exposure of personal data through XSS could lead to regulatory penalties and reputational damage. The requirement for user interaction means that targeted phishing or social engineering campaigns could be used to exploit this vulnerability, increasing the risk to organizations with large user bases or less security-aware personnel.
Mitigation Recommendations
Organizations should prioritize upgrading ExtremeControl to version 25.5.12 or later once available, as this will contain the necessary fixes for the XSS vulnerability. Until a patch is applied, administrators should implement strict input validation and output encoding on the login interface, if customization is possible. Deploying Web Application Firewalls (WAFs) with rules designed to detect and block XSS payloads targeting ExtremeControl can provide interim protection. Additionally, organizations should educate users about the risks of interacting with suspicious links or inputs on the login page to reduce the likelihood of successful exploitation. Monitoring logs for unusual activities related to the login interface and implementing Content Security Policy (CSP) headers can help mitigate the impact of injected scripts. Network segmentation and limiting access to the ExtremeControl management interface to trusted IP ranges will reduce exposure. Finally, organizations should prepare incident response plans to quickly address any exploitation attempts and review user session management to detect anomalies.
Affected Countries
Germany, France, United Kingdom, Netherlands, Sweden, Italy, Spain, Belgium
CVE-2025-6235: CWE-79 Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') in Extreme Networks ExtremeControl
Description
In ExtremeControl before 25.5.12, a cross-site scripting (XSS) vulnerability was discovered in a login interface of the affected application. The issue stems from improper handling of user-supplied input within HTML attributes, allowing an attacker to inject script code that may execute in a user's browser under specific interaction conditions. Successful exploitation could lead to exposure of user data or unauthorized actions within the browser context.
AI-Powered Analysis
Technical Analysis
CVE-2025-6235 is a cross-site scripting (XSS) vulnerability identified in Extreme Networks' ExtremeControl product, specifically affecting versions prior to 25.5.12, including version 25.2.12. The vulnerability arises from improper neutralization of user-supplied input within HTML attributes on the login interface. This improper handling allows an attacker to inject malicious script code that executes in the context of a victim's browser when the user interacts with the affected interface. The vulnerability is classified under CWE-79, which pertains to improper input sanitization during web page generation. Exploitation does not require authentication or privileges and can be triggered remotely over the network. The CVSS v4.0 base score is 5.3 (medium severity), reflecting that the attack vector is network-based, with low complexity, no privileges required, but requires user interaction. The impact includes potential exposure of sensitive user data and unauthorized actions performed within the victim's browser session, such as session hijacking, credential theft, or unauthorized commands executed on behalf of the user. No known exploits are currently reported in the wild, and no patches or mitigation links have been published at the time of this report. The vulnerability affects the login interface, a critical entry point, increasing the risk of successful exploitation if users access the vulnerable version of ExtremeControl. Given the nature of XSS, the attack scope is limited to the browser context of users interacting with the vulnerable interface, but the consequences can be significant in environments where ExtremeControl manages network access and security policies.
Potential Impact
For European organizations, the impact of CVE-2025-6235 can be considerable, especially for enterprises and service providers relying on ExtremeControl for network access control and policy enforcement. Successful exploitation could lead to unauthorized access to user sessions, leakage of sensitive authentication tokens, or manipulation of user actions within the management interface. This could compromise network security posture, potentially allowing attackers to pivot within the network or disrupt normal operations. Given that ExtremeControl is often deployed in environments requiring strict access control, such as universities, enterprises, and public sector networks, the vulnerability could undermine trust in network security mechanisms. Additionally, GDPR considerations heighten the risk profile, as exposure of personal data through XSS could lead to regulatory penalties and reputational damage. The requirement for user interaction means that targeted phishing or social engineering campaigns could be used to exploit this vulnerability, increasing the risk to organizations with large user bases or less security-aware personnel.
Mitigation Recommendations
Organizations should prioritize upgrading ExtremeControl to version 25.5.12 or later once available, as this will contain the necessary fixes for the XSS vulnerability. Until a patch is applied, administrators should implement strict input validation and output encoding on the login interface, if customization is possible. Deploying Web Application Firewalls (WAFs) with rules designed to detect and block XSS payloads targeting ExtremeControl can provide interim protection. Additionally, organizations should educate users about the risks of interacting with suspicious links or inputs on the login page to reduce the likelihood of successful exploitation. Monitoring logs for unusual activities related to the login interface and implementing Content Security Policy (CSP) headers can help mitigate the impact of injected scripts. Network segmentation and limiting access to the ExtremeControl management interface to trusted IP ranges will reduce exposure. Finally, organizations should prepare incident response plans to quickly address any exploitation attempts and review user session management to detect anomalies.
Affected Countries
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Technical Details
- Data Version
- 5.1
- Assigner Short Name
- ExtremeNetworks
- Date Reserved
- 2025-06-18T13:40:51.983Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 687e4ba8a83201eaac10094a
Added to database: 7/21/2025, 2:16:08 PM
Last enriched: 7/21/2025, 2:31:39 PM
Last updated: 7/22/2025, 8:12:37 PM
Views: 2
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