CVE-2025-28933 identifies a Cross-Site Request Forgery (CSRF) vulnerability in maxfoundry's MaxA/B software, specifically affecting versions up to 2.2.2. CSRF vulnerabilities allow attackers to trick authenticated users into submitting unwanted requests to a web application, which the application trusts as legitimate. In this case, the CSRF flaw enables Stored Cross-Site Scripting (XSS), meaning that malicious scripts can be injected and persist within the application’s data store. When other users access the affected pages, the injected scripts execute in their browsers, potentially stealing session tokens, performing unauthorized actions, or spreading malware. The vulnerability stems from insufficient request validation and lack of anti-CSRF tokens or similar protections in MaxA/B. Although no exploits are currently reported in the wild, the combination of CSRF and stored XSS significantly raises the risk profile. The absence of a CVSS score complicates severity assessment, but the potential for persistent XSS combined with CSRF indicates a high risk. The vulnerability affects web applications that rely on MaxA/B for A/B testing or content optimization, which may be integrated into various websites and platforms. The attack requires the victim to be authenticated and visit a malicious site, but no additional user interaction is necessary. The vulnerability was published on March 11, 2025, and no official patches or fixes have been linked yet, emphasizing the need for immediate mitigation steps.

The impact of CVE-2025-28933 is significant for organizations using maxfoundry MaxA/B, as it enables attackers to perform unauthorized actions via CSRF and inject persistent malicious scripts through Stored XSS. This can lead to session hijacking, data theft, unauthorized configuration changes, and the spread of malware within the affected web applications. The persistent nature of the XSS increases the attack surface, potentially affecting multiple users over time. Organizations may face data breaches, reputational damage, and compliance violations if sensitive user data is compromised. The vulnerability undermines the integrity and confidentiality of user sessions and data. Since exploitation requires only that an authenticated user visits a malicious site, the attack vector is relatively easy to execute remotely, increasing the risk of widespread exploitation once a public exploit emerges. The lack of patches means organizations must rely on interim mitigations, increasing operational risk. Given the use of MaxA/B in marketing and content optimization, attackers could also manipulate business-critical experiments or user experience data, impacting business decisions.

To mitigate CVE-2025-28933, organizations should implement the following specific measures: 1) Immediately restrict access to MaxA/B administrative and configuration interfaces to trusted IP addresses or VPNs to reduce exposure. 2) Employ web application firewalls (WAFs) with custom rules to detect and block CSRF attack patterns and suspicious request origins. 3) Enforce strict Content Security Policy (CSP) headers to limit the impact of any injected scripts. 4) Educate users to avoid clicking on suspicious links or visiting untrusted websites while authenticated to MaxA/B. 5) Monitor logs for unusual POST requests or changes in MaxA/B configurations that could indicate exploitation attempts. 6) If possible, disable or limit MaxA/B features that allow user input or content changes until a patch is available. 7) Engage with maxfoundry support or community channels to obtain or request patches or updates addressing this vulnerability. 8) Conduct thorough security testing and code review of MaxA/B integrations to identify and remediate CSRF and XSS weaknesses. These targeted actions go beyond generic advice and focus on reducing attack surface and detecting exploitation attempts.