CVE-2025-62100 identifies a missing authorization vulnerability in the ThemeRain Core product, specifically affecting versions up to and including 1.1.9. The vulnerability stems from incorrectly configured access control mechanisms within the core component of the ThemeRain framework, which is commonly used in web development and content management systems. Due to the absence of proper authorization checks, remote attackers can exploit this flaw without requiring any authentication or user interaction. The vulnerability allows attackers to perform unauthorized actions that compromise data integrity, such as modifying configurations or content, but does not impact confidentiality or availability. The CVSS v3.1 base score is 5.3, reflecting a medium severity level, with an attack vector of network (remote), low attack complexity, no privileges required, and no user interaction needed. No known exploits have been reported in the wild to date. The vulnerability was reserved in October 2025 and published in December 2025. No patches or fixes are currently linked, indicating that organizations must monitor for updates or apply compensating controls. The lack of authorization checks can lead to unauthorized modifications that may disrupt normal operations or deface websites relying on ThemeRain Core. Given the product’s use in web environments, the vulnerability poses a risk to the integrity of hosted content and configurations.

For European organizations, the missing authorization vulnerability in ThemeRain Core could lead to unauthorized modifications of website content, configurations, or other critical data managed by the affected software. This can result in data integrity issues, potential defacement, or misconfiguration that disrupts business operations or damages organizational reputation. Since the vulnerability does not affect confidentiality or availability, the primary concern is unauthorized data alteration. Organizations relying on ThemeRain Core for web presence or content management may face increased risk of targeted attacks exploiting this flaw, especially if their systems are internet-facing. The ease of exploitation without authentication increases the threat level, potentially enabling attackers to compromise multiple installations rapidly. This could be particularly impactful for European SMEs and enterprises that use ThemeRain Core in their digital infrastructure without robust access controls or monitoring. The absence of known exploits provides a window for proactive mitigation before widespread exploitation occurs.

1. Monitor official ThemeRain channels and security advisories for patches or updates addressing CVE-2025-62100 and apply them promptly upon release. 2. Until patches are available, implement strict network-level access controls to restrict access to ThemeRain Core management interfaces to trusted IP addresses or VPNs. 3. Conduct a thorough review of access control configurations within ThemeRain Core installations to identify and remediate any misconfigurations. 4. Employ web application firewalls (WAFs) with custom rules to detect and block unauthorized requests targeting ThemeRain Core endpoints. 5. Enable detailed logging and continuous monitoring of ThemeRain Core activities to detect suspicious or unauthorized modifications early. 6. Educate administrators and developers about the risks of missing authorization and enforce the principle of least privilege in managing web applications. 7. Consider isolating ThemeRain Core instances in segmented network zones to limit potential lateral movement in case of compromise. 8. Regularly back up website content and configurations to enable rapid recovery from unauthorized changes.