CVE-2024-22720 is a medium-severity vulnerability affecting Kanboard version 1.2.34, specifically involving an HTML Injection flaw in the group management feature. Kanboard is an open-source project management software that allows teams to organize tasks visually. The vulnerability is classified under CWE-79, which corresponds to Cross-Site Scripting (XSS) related issues, but here it is described as HTML Injection, a variant where malicious HTML code can be injected and rendered in the context of the application. The CVSS v3.1 score of 4.8 indicates a medium impact, with the vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N meaning the attack can be performed remotely over the network (AV:N) with low attack complexity (AC:L), but requires high privileges (PR:H) and user interaction (UI:R). The scope is changed (S:C), indicating that the vulnerability affects resources beyond the initially vulnerable component. The impact on confidentiality and integrity is low (C:L/I:L), with no impact on availability (A:N). The vulnerability allows an authenticated user with high privileges to inject malicious HTML code that could be rendered in other users' browsers, potentially leading to session hijacking, phishing, or other client-side attacks. However, no known exploits are reported in the wild, and no patches or vendor information are currently available. The lack of vendor/project and product details suggests limited public information or that Kanboard is the affected product, but not explicitly stated in the source data.

For European organizations using Kanboard 1.2.34, this vulnerability poses a risk primarily to internal project management environments where group management features are used. An attacker with high privileges (e.g., an administrator or group manager) could inject malicious HTML that may execute in the browsers of other users, potentially compromising session tokens or redirecting users to malicious sites. This could lead to unauthorized access to sensitive project data or disruption of collaboration workflows. Given the requirement for high privileges and user interaction, the risk is somewhat mitigated but still significant in environments with multiple administrators or where privilege escalation is possible. The impact on confidentiality and integrity, while low, could still affect sensitive project information and user trust. European organizations with strict data protection regulations (e.g., GDPR) must consider the potential for data leakage or unauthorized access resulting from exploitation. Additionally, the collaborative nature of Kanboard means that such an attack could disrupt team productivity and cause reputational damage.

1. Restrict administrative and group management privileges strictly to trusted personnel to reduce the risk of malicious insiders exploiting this vulnerability. 2. Implement input validation and output encoding on all user-supplied data in the group management feature to prevent HTML injection. 3. Monitor and audit group management activities for unusual behavior or unauthorized changes. 4. Encourage users to avoid clicking on suspicious links or interacting with unexpected content within Kanboard. 5. If possible, upgrade to a newer version of Kanboard where this vulnerability is fixed; if no patch is available, consider applying custom patches or workarounds such as sanitizing inputs at the web server or application firewall level. 6. Employ Content Security Policy (CSP) headers to restrict the execution of injected scripts or HTML. 7. Educate users about the risks of social engineering and phishing attacks that could leverage this vulnerability. 8. Regularly back up Kanboard data to enable recovery in case of compromise.