CVE-2025-20328 is a medium-severity cross-site scripting (XSS) vulnerability affecting the user profile component of Cisco Webex Meetings. This vulnerability arises from improper neutralization of user-supplied input during web page generation, specifically insufficient validation of input fields within the user profile functionality. An authenticated attacker with low privileges can exploit this flaw by crafting a malicious link and persuading a user of the Webex Meetings web interface to click it. Upon successful exploitation, the attacker can execute arbitrary scripts in the context of the victim's browser session. This can lead to the theft of session tokens, user credentials, or other sensitive information accessible via the browser, as well as potential manipulation of the web interface. The vulnerability requires the attacker to have some level of authentication (low privileges) and user interaction (clicking a crafted link). Cisco has addressed this issue in their Webex Meetings service, and no customer action is currently required, indicating the fix has been deployed on the service side. The CVSS v3.1 base score is 5.4, reflecting a medium severity with the vector AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N, meaning the attack is network exploitable with low attack complexity, requires low privileges and user interaction, affects confidentiality and integrity partially, but does not impact availability. The scope is changed, indicating the vulnerability affects resources beyond the initially vulnerable component. No known exploits are reported in the wild at this time.

For European organizations, this vulnerability poses a risk primarily to confidentiality and integrity of user data within Cisco Webex Meetings, a widely used collaboration platform. Successful exploitation could allow attackers to hijack user sessions, steal sensitive meeting information, or manipulate meeting-related data, potentially leading to unauthorized disclosure or alteration of confidential communications. Given the reliance on Webex Meetings for remote work, especially in sectors like finance, healthcare, and government, exploitation could disrupt trust and confidentiality of communications. However, the requirement for attacker authentication and user interaction limits the ease of exploitation. The fact that Cisco has already remediated the issue on their service reduces immediate risk, but organizations should remain vigilant, especially those with custom integrations or on-premises deployments if applicable. The vulnerability does not affect availability, so disruption of service is unlikely. Overall, the impact is moderate but significant enough to warrant attention in environments where sensitive or regulated data is handled via Webex Meetings.

Although Cisco has addressed this vulnerability on their service side, European organizations should take proactive steps to mitigate residual risks: 1) Educate users about the risks of clicking unsolicited or suspicious links within Webex Meetings or related communications to reduce the likelihood of successful phishing attempts exploiting this XSS. 2) Monitor Webex Meetings usage and logs for unusual activity that could indicate exploitation attempts, such as unexpected script execution or anomalous user behavior. 3) Ensure that all Webex Meetings clients and integrations are updated to the latest versions to benefit from vendor patches and security improvements. 4) Implement Content Security Policy (CSP) headers and other browser security controls where possible to limit the impact of potential XSS attacks. 5) For organizations using custom or on-premises Webex deployments, verify that patches addressing this vulnerability have been applied. 6) Employ multi-factor authentication (MFA) to reduce the risk posed by compromised credentials resulting from XSS attacks. 7) Regularly review and restrict user privileges within Webex Meetings to the minimum necessary, limiting the ability of low-privilege attackers to exploit such vulnerabilities.