CVE-2022-47411 is a medium-severity vulnerability affecting multiple versions of the fp_newsletter extension used within TYPO3 content management systems. The fp_newsletter extension manages newsletter subscriber data and provides functionality such as subscription and unsubscription operations. The vulnerability specifically arises from the unsubscribeAction operation, which improperly exposes subscriber data. This exposure constitutes an information disclosure vulnerability categorized under CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor). The flaw allows an attacker to obtain subscriber information without proper authorization or authentication controls. The affected versions include all versions before 1.1.1, 1.2.0, 2.x before 2.1.2, 2.2.1 through 2.4.0, and 3.x before 3.2.6, indicating a broad range of impacted releases spanning multiple major versions. No official patch links are provided in the available data, and there are no known exploits in the wild at this time. The vulnerability was published on December 14, 2022, and has been enriched by CISA, indicating recognition by U.S. cybersecurity authorities. The core technical issue is that the unsubscribeAction operation does not sufficiently restrict access to subscriber data, potentially allowing unauthorized users to retrieve personal information such as email addresses or other subscriber details. This could lead to privacy violations and facilitate further targeted attacks such as phishing or social engineering. TYPO3 is a widely used open-source CMS, particularly popular in European public sector and enterprise environments, making this vulnerability relevant to organizations relying on TYPO3 for their web presence and communications.

For European organizations, the impact of CVE-2022-47411 primarily concerns the confidentiality of subscriber data managed via TYPO3's fp_newsletter extension. Unauthorized disclosure of subscriber information can lead to privacy breaches, regulatory non-compliance (notably under GDPR), reputational damage, and increased risk of targeted phishing campaigns against subscribers or the organization itself. Organizations in sectors such as government, education, healthcare, and media—where TYPO3 adoption is significant—may face heightened risks. The exposure of subscriber data could also undermine trust in the organization's communication channels and lead to legal liabilities. Although the vulnerability does not directly affect system integrity or availability, the indirect consequences of data leakage can be severe. Given the absence of known exploits in the wild, the immediate risk is moderate; however, the ease of exploiting an information disclosure flaw without authentication increases the likelihood of exploitation attempts. The scope includes all TYPO3 installations using vulnerable versions of the fp_newsletter extension, which can be widespread across European institutions and enterprises.

To mitigate CVE-2022-47411, European organizations should: 1) Immediately identify TYPO3 instances using the fp_newsletter extension and determine the installed version. 2) Upgrade the fp_newsletter extension to the latest available version (3.2.6 or higher) where the vulnerability is addressed. If an official patch is not yet available, consider applying temporary access controls to restrict unsubscribeAction operations to authenticated and authorized users only. 3) Implement strict access control policies on newsletter management endpoints, including rate limiting and IP filtering to reduce the attack surface. 4) Audit web server and application logs for unusual access patterns to unsubscribe endpoints that may indicate exploitation attempts. 5) Review and enhance subscriber data protection measures, including encryption at rest and in transit, and ensure compliance with GDPR data minimization principles. 6) Educate newsletter administrators and IT staff about the vulnerability and the importance of timely patching. 7) Consider deploying web application firewalls (WAF) with custom rules to detect and block unauthorized unsubscribeAction requests until patches are applied. These steps go beyond generic advice by focusing on immediate operational controls and monitoring tailored to the unsubscribeAction vector.