CVE-2025-62100 identifies a Missing Authorization vulnerability in the ThemeRain Core product, specifically affecting versions up to 1.1.9. The vulnerability arises from incorrectly configured access control security levels, which means that certain functions or resources within the ThemeRain Core framework can be accessed or manipulated without proper authorization checks. This type of vulnerability typically allows attackers to perform unauthorized actions such as viewing, modifying, or deleting data, or altering configurations that should be restricted. The vulnerability does not require prior authentication or user interaction, increasing its risk profile. ThemeRain Core is a theme framework used primarily in website development, often integrated into content management systems like WordPress. The lack of a CVSS score indicates that the vulnerability is newly published and has not yet been fully assessed or exploited in the wild. However, the nature of missing authorization flaws generally leads to significant security concerns because they undermine the fundamental security principle of least privilege. Without proper access control, attackers can escalate privileges or access sensitive administrative functions, potentially leading to data breaches, defacement, or further compromise of the hosting environment. The vulnerability was reserved in early October 2025 and published in December 2025, indicating recent discovery and disclosure. No patches or known exploits are currently available, emphasizing the need for proactive mitigation.

For European organizations, the impact of CVE-2025-62100 could be substantial, especially for those relying on ThemeRain Core for website or application theming. Unauthorized access due to missing authorization can lead to data confidentiality breaches, unauthorized data modification, or disruption of service availability if attackers manipulate critical theme components. This could result in reputational damage, regulatory non-compliance (e.g., GDPR violations if personal data is exposed), and operational disruptions. Organizations in sectors such as e-commerce, finance, healthcare, and government, where website integrity and data protection are paramount, are particularly at risk. The ease of exploitation without authentication increases the threat level, making automated or opportunistic attacks feasible. Additionally, compromised themes can serve as a foothold for further attacks on the underlying infrastructure or connected systems. Given the widespread use of CMS platforms and themes in Europe, the vulnerability could affect a broad range of entities, from small businesses to large enterprises.

Organizations should immediately audit their ThemeRain Core installations to identify affected versions (<=1.1.9). Until an official patch is released, administrators should restrict access to theme management interfaces to trusted personnel only and implement network-level controls such as IP whitelisting or VPN access for administrative functions. Review and tighten access control policies within the CMS and underlying hosting environment to minimize exposure. Employ web application firewalls (WAFs) with custom rules to detect and block unauthorized access attempts targeting theme-related endpoints. Monitor logs for unusual activity related to theme configuration or access patterns. Engage with the vendor or community to track patch releases and apply updates promptly once available. Consider isolating critical web assets and performing regular security assessments to detect potential exploitation attempts. Backup website data and configurations regularly to enable rapid recovery in case of compromise.