CVE-2025-65113 affects ClipBucket v5, an open-source platform for video sharing, prior to version 5.5.2 - #164. The vulnerability arises from an authorization bypass in the AJAX flagging system, which is responsible for allowing users to flag inappropriate or problematic content. Due to improper access control, unauthenticated attackers can submit flag requests on any content type, including users, videos, photos, and collections. This leads to the potential for mass flagging attacks, overwhelming the moderation system and causing legitimate content to be erroneously flagged or removed. The root cause is linked to CWE-770, which involves allocation of resources without limits or throttling, allowing attackers to exhaust moderation resources or disrupt content availability. The CVSS v3.1 score of 6.5 reflects a medium severity, with an attack vector of network, no privileges or user interaction required, and impacts on integrity and availability but not confidentiality. Although no exploits are currently reported in the wild, the vulnerability poses a risk to platforms relying on ClipBucket for content management. The issue was addressed and patched in version 5.5.2 - #164, which implements proper authorization checks and resource throttling to prevent abuse.

For European organizations using ClipBucket v5 versions prior to 5.5.2, this vulnerability can lead to significant operational disruption. Attackers can perform mass flagging of content, causing legitimate videos, photos, users, or collections to be incorrectly flagged or removed, undermining content integrity and user trust. This can degrade platform availability and user experience, potentially leading to reputational damage and loss of audience engagement. Moderation teams may be overwhelmed by false flags, increasing operational costs and response times. In sectors where video sharing platforms are used for education, media, or community engagement, this disruption can have broader social and economic impacts. While confidentiality is not directly affected, the integrity and availability of content are at risk. The ease of exploitation (no authentication or user interaction needed) increases the likelihood of automated abuse campaigns. Organizations failing to patch may face service degradation or denial of service conditions due to resource exhaustion in the moderation system.

European organizations should immediately upgrade ClipBucket to version 5.5.2 - #164 or later, where the vulnerability is patched. Until upgrade, implement network-level controls such as rate limiting and IP reputation filtering on AJAX flagging endpoints to reduce abuse risk. Employ Web Application Firewalls (WAFs) with custom rules to detect and block anomalous flagging request patterns. Enhance monitoring and alerting on flagging activity to detect mass flagging attempts early. Review and tighten moderation workflows to include manual verification for flagged content during the interim period. Consider disabling the flagging feature temporarily if feasible, or restricting it to authenticated users only via custom patches. Conduct regular audits of flagged content to identify and revert false positives promptly. Engage with the ClipBucket community or vendor for any backported patches or additional security advisories. Finally, educate moderation teams about this vulnerability to improve incident response readiness.