CVE-2025-53465 is a high-severity vulnerability classified under CWE-502, which involves the deserialization of untrusted data in the raoinfotech GSheets Connector product. This vulnerability allows for object injection attacks due to improper handling of serialized data inputs. Specifically, the GSheets Connector versions up to 1.1.1 are affected, although the exact starting version is not specified. Deserialization vulnerabilities occur when an application deserializes data from untrusted sources without sufficient validation or sanitization, enabling attackers to craft malicious serialized objects that, when deserialized, can execute arbitrary code, alter application logic, or cause denial of service. The CVSS v3.1 score of 7.2 reflects a high impact on confidentiality, integrity, and availability, with network attack vector, low attack complexity, but requiring high privileges and no user interaction. This suggests that an attacker with elevated privileges on the network can exploit this vulnerability remotely without user involvement. The vulnerability is currently published and has no known exploits in the wild or available patches, indicating that organizations using this connector should prioritize mitigation. The GSheets Connector likely integrates Google Sheets functionality into other applications or workflows, and exploitation could lead to unauthorized data access, manipulation, or disruption of services relying on this integration.

For European organizations, this vulnerability poses significant risks especially for those relying on raoinfotech's GSheets Connector within their IT infrastructure. The potential impacts include unauthorized disclosure of sensitive data stored or processed via Google Sheets integrations, manipulation of data integrity leading to erroneous business decisions, and disruption of availability which could affect business continuity. Given the high confidentiality, integrity, and availability impact, organizations handling sensitive or regulated data (e.g., financial, healthcare, or personal data under GDPR) could face compliance violations, financial losses, and reputational damage. The requirement for high privileges to exploit the vulnerability means that insider threats or compromised privileged accounts could be leveraged by attackers, increasing the risk in environments with inadequate privilege management. The lack of known exploits currently provides a window for proactive defense, but also means that attackers may develop exploits in the near future, making timely mitigation critical.

European organizations should implement the following specific mitigation strategies: 1) Immediately audit and inventory all instances of raoinfotech GSheets Connector in use, identifying versions and deployment contexts. 2) Restrict and monitor privileged accounts that have access to the connector to reduce the risk of exploitation by insiders or compromised credentials. 3) Employ network segmentation and firewall rules to limit access to the connector’s services only to trusted hosts and users. 4) Implement strict input validation and deserialization controls where possible, such as using safe deserialization libraries or disabling deserialization of untrusted data if configurable. 5) Monitor logs and network traffic for anomalous activities indicative of exploitation attempts, including unusual serialized object payloads or unexpected access patterns. 6) Engage with raoinfotech for updates or patches and apply them promptly once available. 7) Consider deploying runtime application self-protection (RASP) or web application firewalls (WAF) with custom rules to detect and block deserialization attack vectors targeting the connector. 8) Conduct security awareness training focusing on the risks of privilege misuse and the importance of safeguarding credentials.