CVE-2026-22349 identifies a DOM-based Cross-Site Scripting (XSS) vulnerability in the linux4me2 Menu In Post plugin, versions up to and including 1.4.1. The vulnerability stems from improper neutralization of user-supplied input during the generation of web pages, specifically within the Menu In Post component. This flaw allows an attacker to inject malicious scripts that execute in the victim's browser context when interacting with crafted content. The attack requires the attacker to have low privileges (PR:L) and user interaction (UI:R), such as convincing a user to click a malicious link or interact with a manipulated page element. The vulnerability affects confidentiality and integrity by potentially exposing sensitive information or enabling unauthorized actions on behalf of the user, but it does not impact system availability. The CVSS 3.1 base score is 5.4 (medium severity), reflecting the moderate risk posed by this vulnerability. The vulnerability is network exploitable (AV:N), with low attack complexity (AC:L), but requires privileges and user interaction, which limits widespread exploitation. No known exploits are currently reported in the wild, and no official patches have been linked, indicating that mitigation is currently reliant on defensive measures and monitoring. The vulnerability is particularly relevant for web applications using the linux4me2 Menu In Post plugin, which may be integrated into content management systems or custom web platforms.

For European organizations, this vulnerability poses a moderate risk primarily to web applications utilizing the linux4me2 Menu In Post plugin. Exploitation could lead to unauthorized disclosure of sensitive information, session hijacking, or unauthorized actions performed in the context of authenticated users, potentially compromising user data and trust. While the vulnerability does not affect availability, the integrity and confidentiality impacts can disrupt business operations, especially for organizations handling personal data under GDPR regulations. Attackers could leverage this vulnerability to target employees or customers via phishing or social engineering, increasing the risk of broader compromise. Organizations in sectors such as finance, healthcare, and government, where data confidentiality is paramount, may face heightened risks. Additionally, reputational damage and regulatory penalties could result from successful exploitation. The lack of known exploits suggests a window for proactive mitigation, but the presence of user interaction requirements means social engineering defenses are also critical.

1. Monitor linux4me2 and Menu In Post plugin vendor channels for official patches and apply them promptly once available. 2. Implement strict input validation and output encoding on all user-supplied data within the affected web application components to prevent script injection. 3. Deploy Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of potential XSS attacks. 4. Educate users and administrators about phishing and social engineering tactics to reduce the likelihood of successful user interaction exploitation. 5. Conduct regular security assessments and code reviews focusing on input handling in web page generation modules. 6. Use web application firewalls (WAFs) with rules tailored to detect and block XSS payloads targeting the Menu In Post plugin. 7. Limit privileges of users and roles interacting with the vulnerable plugin to minimize potential attack vectors. 8. Employ browser security features such as HTTPOnly and Secure flags on cookies to mitigate session hijacking risks. 9. Maintain comprehensive logging and monitoring to detect suspicious activities indicative of exploitation attempts. 10. Consider isolating or replacing the vulnerable plugin with more secure alternatives if immediate patching is not feasible.