CVE-2026-26101 is a vulnerability classified under CWE-732 (Incorrect Permission Assignment for Critical Resource) affecting Owl opds version 2.2.0.4. The issue arises from improper permission settings on critical resources within the application, allowing an attacker to perform unauthorized file manipulation through specially crafted network requests. The vulnerability does not require user interaction and can be exploited by an attacker with low privileges, making it easier to leverage in targeted attacks. The CVSS 4.0 base score of 8.5 reflects its high severity, with attack vector local (AV:L), low attack complexity (AC:L), no authentication required (AT:N), and no user interaction (UI:N). The vulnerability impacts confidentiality, integrity, and availability at a high level, as unauthorized file manipulation can lead to data leakage, data corruption, or denial of service. No patches or known exploits are currently available, but the vulnerability's nature demands immediate attention. The flaw stems from incorrect permission assignment, which is a common security misconfiguration that can be exploited to escalate privileges or disrupt system operations. Organizations using Owl opds should conduct thorough permission audits and apply mitigations promptly once patches are released.

The vulnerability allows attackers with limited privileges to manipulate files on affected systems, potentially leading to unauthorized data disclosure, data tampering, or service disruption. This can compromise the confidentiality, integrity, and availability of critical resources managed by Owl opds. For organizations relying on this software, exploitation could result in operational downtime, loss of sensitive information, and reputational damage. Given the low complexity and no user interaction required, attackers can automate exploitation in internal or semi-trusted network environments. This elevates the risk for sectors where Owl opds is deployed, especially in environments handling sensitive or critical data. The absence of known exploits currently provides a window for proactive defense, but the high CVSS score indicates that successful exploitation would have severe consequences.

1. Immediately review and restrict permissions on critical resources within Owl opds to ensure the principle of least privilege is enforced. 2. Implement network segmentation and firewall rules to limit access to Owl opds services only to trusted hosts and users. 3. Monitor network traffic for unusual or malformed requests targeting Owl opds endpoints to detect potential exploitation attempts. 4. Conduct regular audits of file system permissions and application configurations to identify and remediate misconfigurations. 5. Prepare for patch deployment by tracking vendor updates and testing patches in controlled environments before production rollout. 6. Employ application-layer intrusion detection systems (IDS) to identify anomalous file manipulation activities. 7. Educate system administrators about the risks of incorrect permission assignments and best practices for secure configuration management. 8. If patching is delayed, consider temporary compensating controls such as disabling vulnerable features or restricting network access further.