CVE-2025-62912 is a stored Cross-site Scripting (XSS) vulnerability identified in SiteGround Email Marketing software versions up to and including 1.7.1. The vulnerability stems from improper neutralization of user-supplied input during the generation of web pages, which allows attackers to inject malicious scripts that are stored persistently within the application. When other users access the affected pages, the malicious scripts execute in their browsers under the context of the vulnerable domain. This can lead to a range of attacks including session hijacking, theft of authentication tokens, defacement, or delivery of further malware payloads. The vulnerability does not require prior authentication or user interaction to be exploited, increasing its risk profile. Although no public exploits have been reported yet, the widespread use of SiteGround Email Marketing in managing customer communications and campaigns means that successful exploitation could compromise sensitive customer data and damage organizational reputation. The lack of a CVSS score indicates that the vulnerability is newly disclosed and not yet fully assessed, but the nature of stored XSS vulnerabilities typically implies a significant risk. The vulnerability affects versions up to 1.7.1, and no patches are currently linked, emphasizing the need for immediate attention from users of this software. The vulnerability was published on October 27, 2025, and assigned by Patchstack, indicating credible reporting and tracking.

For European organizations, the impact of CVE-2025-62912 can be substantial. Stored XSS vulnerabilities allow attackers to execute arbitrary scripts in the browsers of users who visit compromised pages, potentially leading to unauthorized access to sensitive information such as personal data, authentication credentials, and session tokens. This can result in data breaches, regulatory non-compliance (e.g., GDPR violations), and reputational damage. Organizations relying on SiteGround Email Marketing for customer engagement may see their communications channels exploited to distribute malicious content or phishing attacks. The persistent nature of stored XSS means that the malicious payload remains active until remediated, increasing the window of exposure. Additionally, attackers could leverage this vulnerability to pivot into internal networks if users with elevated privileges are targeted. The lack of known exploits in the wild currently reduces immediate risk but does not eliminate the threat, especially as attackers often develop exploits rapidly after disclosure. The impact on availability is limited, but the confidentiality and integrity of data are at high risk.

To mitigate CVE-2025-62912, organizations should prioritize the following actions: 1) Monitor SiteGround’s official channels for patches or updates addressing this vulnerability and apply them immediately upon release. 2) Implement strict input validation and output encoding on all user-supplied data within the SiteGround Email Marketing platform to prevent injection of malicious scripts. 3) Deploy Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of potential XSS attacks. 4) Conduct regular security audits and penetration testing focused on web application vulnerabilities, including XSS. 5) Educate users and administrators about the risks of XSS and encourage vigilance when interacting with email marketing content. 6) Where possible, isolate the email marketing platform from critical internal systems to limit lateral movement in case of compromise. 7) Utilize web application firewalls (WAFs) configured to detect and block XSS attack patterns targeting the affected application. 8) Review and sanitize stored content periodically to identify and remove any injected malicious scripts. These measures, combined, will reduce the risk and impact of exploitation.