CVE-2025-54390 is a Cross-Site Request Forgery (CSRF) vulnerability identified in the ResetPasswordRequest operation of Zimbra Collaboration Suite (ZCS), a widely used enterprise email and collaboration platform. The vulnerability arises when the zimbraFeatureResetPasswordStatus attribute is enabled, which allows password reset functionality. Due to the absence of CSRF token validation on the ResetPasswordRequest SOAP endpoint, an attacker can craft a malicious webpage that, when visited by an authenticated ZCS user, silently sends a forged SOAP request to reset the user's password without their knowledge or consent. This attack exploits the trust that the ZCS server places in the authenticated user's browser session, bypassing normal authorization checks. The lack of CSRF protection means that the server cannot distinguish between legitimate password reset requests initiated by the user and malicious requests triggered by an attacker. Although no specific affected versions are listed, the vulnerability is tied to the presence of the zimbraFeatureResetPasswordStatus attribute, suggesting that any ZCS deployment with this feature enabled is at risk. No public exploits have been reported yet, and no CVSS score has been assigned. However, the vulnerability's nature allows an attacker to take over user accounts by resetting passwords, potentially leading to unauthorized access to sensitive email communications and collaboration data.

For European organizations using Zimbra Collaboration Suite with the vulnerable feature enabled, this vulnerability poses a significant risk to user account security and overall organizational confidentiality. Successful exploitation could allow attackers to reset passwords of legitimate users, leading to account takeover and unauthorized access to corporate emails, calendars, contacts, and other collaboration data. This could result in data breaches, intellectual property theft, and disruption of business operations. Given that email systems are critical communication infrastructure, compromise could also facilitate further attacks such as phishing, lateral movement within networks, and exfiltration of sensitive information. The impact is particularly severe for organizations in regulated sectors such as finance, healthcare, and government, where data protection requirements are stringent under GDPR and other European regulations. Additionally, the silent nature of the attack means users may not be aware of compromise until damage has occurred, complicating incident detection and response.

To mitigate this vulnerability, European organizations should first verify if the zimbraFeatureResetPasswordStatus attribute is enabled in their ZCS deployments. If enabled, immediate steps should include disabling this feature if it is not essential for business operations. If the feature is required, organizations should apply any available patches or updates from Zimbra that address CSRF protections on the ResetPasswordRequest operation as soon as they are released. In the absence of official patches, implementing web application firewalls (WAFs) with rules to detect and block suspicious SOAP requests lacking proper origin or referrer headers can provide interim protection. Additionally, organizations should enforce multi-factor authentication (MFA) on user accounts to reduce the risk of account takeover even if passwords are reset. User awareness training should emphasize caution when clicking on unsolicited links or visiting untrusted websites while logged into corporate systems. Monitoring and alerting on unusual password reset activities and login anomalies can help detect exploitation attempts early. Finally, reviewing and tightening session management and CSRF protections across all web interfaces of ZCS is recommended to prevent similar vulnerabilities.