CVE-2025-7863 is an open redirect vulnerability identified in thinkgem JeeSite versions up to 5.12.0. The vulnerability resides in the redirectUrl function within the ServletUtils.java file (src/main/java/com/jeesite/common/web/http/ServletUtils.java). An attacker can manipulate the 'url' argument passed to this function, causing the application to redirect users to arbitrary external URLs. This type of vulnerability is classified as an open redirect, which can be exploited remotely without requiring authentication. The vulnerability is rated with a CVSS 4.0 base score of 5.1, indicating a medium severity level. The attack vector is network-based (AV:N), with low attack complexity (AC:L), no privileges required (PR:L), but user interaction is needed (UI:P). The impact primarily affects integrity and availability minimally, with no direct confidentiality impact. The vulnerability does not require special conditions such as scope change or advanced privileges, making it relatively straightforward to exploit if a user is tricked into clicking a malicious link crafted to exploit the redirectUrl function. The vendor has released a patch identified by commit 3d06b8d009d0267f0255acc87ea19d29d07cedc3 to remediate this issue. No known exploits are currently reported in the wild. Open redirect vulnerabilities can be leveraged in phishing campaigns, facilitating social engineering attacks by redirecting users to malicious websites under the guise of a trusted domain, potentially leading to credential theft or malware distribution.

For European organizations using thinkgem JeeSite, this vulnerability poses a moderate risk primarily through social engineering and phishing attacks. Attackers can exploit the open redirect to craft URLs that appear legitimate but redirect users to malicious sites, undermining user trust and potentially leading to credential compromise or malware infections. This can affect the integrity of user sessions and the organization's reputation. While the vulnerability itself does not directly compromise system confidentiality or availability, the secondary effects of successful phishing or malware delivery can lead to broader security incidents. Organizations in sectors with high user interaction, such as government portals, educational institutions, or public service platforms using JeeSite, may face increased risk. Additionally, regulatory frameworks like GDPR require organizations to protect user data and prevent phishing attacks, so failure to address this vulnerability could have compliance implications.

1. Apply the official patch provided by thinkgem as identified by commit 3d06b8d009d0267f0255acc87ea19d29d07cedc3 immediately to all affected JeeSite instances. 2. Implement strict validation and sanitization of URL parameters used in redirects to ensure only internal or whitelisted URLs are allowed. 3. Employ Content Security Policy (CSP) headers to restrict the domains that can be loaded or navigated to from the application. 4. Educate users about the risks of clicking on suspicious links, especially those that appear to redirect through trusted domains. 5. Monitor web server logs for unusual redirect patterns or spikes in redirect URL parameters that could indicate exploitation attempts. 6. Use web application firewalls (WAF) with rules designed to detect and block open redirect attempts targeting the redirectUrl function. 7. Conduct regular security assessments and penetration tests focusing on URL handling and redirect mechanisms within JeeSite deployments.