CVE-2022-3245 is a medium-severity vulnerability classified under CWE-94, which pertains to improper control of code generation. This vulnerability affects the Microweber content management system (CMS), specifically the microweber/microweber product. The core issue involves insufficient validation of user input, leading to the possibility of HTML injection attacks. HTML injection is closely related to Cross-Site Scripting (XSS) but differs in that it primarily allows an attacker to inject arbitrary HTML code to deface or manipulate the webpage content rather than injecting executable JavaScript code. However, both attack types exploit the same root cause: inadequate sanitization or validation of user-supplied data before rendering it in the web application. The CVSS v3.0 score for this vulnerability is 4.3, indicating a medium severity level. The vector string (AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:L) suggests that the attack can be performed remotely over the network with low attack complexity but requires high privileges and user interaction. The impact on confidentiality, integrity, and availability is low to medium, as the attacker can modify page content but not necessarily execute arbitrary code or cause system-wide disruption. No known exploits in the wild have been reported, and no official patches or mitigation links are provided in the source data. The vulnerability was published on September 20, 2022, and remains a concern for organizations using affected versions of Microweber CMS, especially those that allow authenticated users to submit content that is rendered without proper sanitization.

For European organizations using Microweber CMS, this vulnerability could lead to defacement of websites or unauthorized modification of displayed content, potentially damaging brand reputation and user trust. While the impact on confidentiality and system integrity is limited, attackers with high privileges could exploit this flaw to alter web pages, possibly misleading users or injecting malicious content that could facilitate phishing or social engineering attacks. The requirement for user interaction and high privileges reduces the likelihood of widespread exploitation but does not eliminate risk, especially in environments where multiple users have elevated access rights. In sectors such as e-commerce, government, and media, where website integrity is critical, even limited HTML injection can have significant operational and reputational consequences. Additionally, regulatory frameworks like GDPR emphasize the protection of user data and system integrity, so any compromise that could indirectly lead to data exposure or manipulation might attract regulatory scrutiny.

European organizations should implement several specific mitigation strategies beyond generic advice: 1) Conduct a thorough audit of all user input points in the Microweber CMS, especially those accessible to authenticated users, to identify where HTML injection could occur. 2) Apply strict input validation and output encoding to sanitize all user-supplied content before rendering it on web pages, using established libraries or frameworks that handle HTML escaping robustly. 3) Restrict the number of users with high privileges to the minimum necessary and enforce the principle of least privilege to reduce the attack surface. 4) Monitor web application logs for unusual content changes or defacement attempts and implement alerting mechanisms for suspicious activities. 5) If possible, isolate the CMS environment and apply web application firewalls (WAFs) configured to detect and block injection attempts targeting Microweber-specific patterns. 6) Stay informed about updates from the Microweber project and apply patches promptly once available. 7) Educate content managers and administrators about the risks of injecting untrusted content and enforce strict content submission policies.