CVE-2026-2898 identifies a deserialization vulnerability in funadmin, an administrative backend system, affecting versions up to 7.1.0-rc4. The flaw exists in the getMember function within the app/common/service/AuthCloudService.php file, where the cloud_account parameter is deserialized without proper validation or sanitization. Deserialization vulnerabilities occur when untrusted input is converted back into objects or data structures, potentially allowing attackers to inject malicious payloads that execute arbitrary code or manipulate application logic. This vulnerability is remotely exploitable without prior authentication, though it requires user interaction, such as triggering the vulnerable function via crafted requests. The CVSS 4.0 score of 5.1 reflects a medium severity, considering the attack vector is network-based with low attack complexity but requiring user interaction and limited privileges. The vulnerability impacts confidentiality, integrity, and availability to a limited extent, as exploitation could lead to unauthorized access or service disruption. The vendor has not issued patches or responded to disclosure, and public exploit code is available, increasing the risk of exploitation. No known exploits in the wild have been reported yet, but the presence of public exploits elevates the threat level. The vulnerability affects backend endpoints, which are critical for authentication and authorization processes, making it a significant concern for organizations relying on funadmin for administrative functions.

The exploitation of this deserialization vulnerability can lead to unauthorized code execution, data leakage, or service disruption within affected funadmin backend systems. Organizations using vulnerable versions may face compromise of sensitive user information, unauthorized privilege escalation, or denial of service conditions. Since the vulnerability is remotely exploitable without authentication, attackers can target exposed backend endpoints over the network, increasing the attack surface. The requirement for user interaction somewhat limits automated exploitation but does not eliminate risk, especially in environments where users may be tricked into triggering the vulnerability. The lack of vendor response and patches means organizations must rely on their own mitigations, increasing operational risk. Potential impacts include loss of confidentiality due to data exposure, integrity violations through unauthorized changes, and availability issues if services are disrupted. This can affect business continuity, regulatory compliance, and reputation. The presence of public exploit code further raises the likelihood of attacks, especially from opportunistic threat actors. Overall, the vulnerability poses a moderate but tangible risk to organizations deploying funadmin in production environments.

1. Immediately restrict or disable access to the vulnerable getMember endpoint in app/common/service/AuthCloudService.php until a patch is available. 2. Implement strict input validation and sanitization on the cloud_account parameter to prevent malicious serialized data from being processed. 3. Employ web application firewalls (WAFs) with custom rules to detect and block suspicious deserialization payloads targeting the vulnerable endpoint. 4. Monitor logs and network traffic for unusual activity patterns indicative of exploitation attempts, such as unexpected serialized data or repeated access to the vulnerable function. 5. If possible, upgrade to a non-vulnerable version of funadmin once the vendor releases a patch or consider applying community-developed patches or mitigations. 6. Conduct security awareness training to reduce the risk of user interaction exploitation vectors, emphasizing caution with unsolicited requests or links. 7. Isolate backend administrative systems from public networks using network segmentation and VPNs to limit exposure. 8. Regularly back up critical data and test restoration procedures to mitigate potential damage from exploitation. 9. Engage with the funadmin community or security researchers for updates on patches or mitigation strategies given the vendor's lack of response.