CVE-2025-11276 in Rebuild
Summary
by MITRE • 10/05/2025
A security flaw has been discovered in Rebuild up to 4.1.3. Affected by this issue is some unknown functionality of the component Comment/Guestbook. Performing manipulation results in cross site scripting. It is possible to initiate the attack remotely. Upgrading to version 4.1.4 can resolve this issue. It is suggested to upgrade the affected component. According to the researcher the vendor has confirmed the flaw and fix in a private issue response.
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Analysis
by VulDB Data Team • 10/05/2025
CVE-2025-11276 represents a cross site scripting vulnerability within the Rebuild content management system affecting versions up to 4.1.3. This flaw specifically impacts the Comment/Guestbook component where improper input validation allows malicious actors to inject malicious scripts into the application's output. The vulnerability stems from insufficient sanitization of user-supplied data within the comment submission functionality, creating an attack surface where remote exploitation is possible. The flaw manifests when users submit comments or guestbook entries containing malicious javascript payloads that execute in the context of other users browsing the affected pages. This type of vulnerability falls under CWE-79 which specifically addresses cross site scripting flaws in web applications. The security implications are significant as attackers can leverage this vulnerability to steal session cookies, perform unauthorized actions on behalf of victims, or redirect users to malicious websites. The attack vector requires no privileged access and can be executed through standard web browser interactions, making it particularly dangerous for public-facing comment systems. According to the vendor's private issue response, the flaw has been acknowledged and patched in version 4.1.4, which implements proper input sanitization and output encoding mechanisms. The recommended mitigation strategy involves immediate upgrading of all affected installations to version 4.1.4 or later. Organizations should also implement additional defensive measures such as web application firewalls, content security policies, and regular security scanning to detect potential exploitation attempts. The vulnerability aligns with ATT&CK technique T1566 which covers social engineering attacks through malicious content injection, and T1190 which addresses exploitation of vulnerabilities in web applications. Given the remote exploitability and potential for widespread impact, system administrators should prioritize this patch deployment across all production environments utilizing the affected Rebuild components. The fix demonstrates the importance of proper input validation and output encoding practices in preventing client-side code injection attacks. Organizations should also conduct thorough security assessments of their web applications to identify similar vulnerabilities in other components that may be susceptible to cross site scripting attacks. The remediation process should include comprehensive testing to ensure that the patch does not introduce regressions in existing functionality while effectively addressing the security flaw. Regular vulnerability assessments and security updates form essential components of maintaining robust security postures against evolving threats in the web application landscape.