CVE-2026-1111 is a path traversal vulnerability identified in Sanluan PublicCMS versions up to 5.202506.d, affecting the Save function within the TaskTemplateAdminController.java file, which handles Task Template Management. The vulnerability arises from improper sanitization of the 'path' argument, allowing an attacker to manipulate file paths and traverse directories outside the intended scope. This can lead to unauthorized reading, modification, or deletion of files on the server hosting the CMS. The attack vector is remote network access, but exploitation requires the attacker to have high privileges (authenticated with elevated rights) on the system. No user interaction is needed, and the vulnerability impacts confidentiality, integrity, and availability at a low level due to the limited scope of path traversal and the requirement for high privileges. The vendor was notified early but has not issued a patch or response, and no known exploits have been observed in the wild yet. The CVSS 4.0 base score is 5.1 (medium severity), reflecting the moderate risk posed by this vulnerability. The lack of vendor response increases the risk of exploitation as attackers may develop exploits based on the public disclosure. Organizations running affected versions should monitor for updates and consider interim mitigations.

For European organizations, this vulnerability poses a moderate risk primarily to those using Sanluan PublicCMS in versions up to 5.202506.d. Successful exploitation could allow attackers with administrative privileges to access or modify sensitive files, potentially leading to data breaches, defacement, or disruption of CMS operations. This could impact confidentiality by exposing sensitive configuration or content files, integrity by allowing unauthorized changes to templates or system files, and availability if critical files are deleted or corrupted. Given the requirement for high privileges, the threat is more significant in environments where administrative credentials are weakly protected or where insider threats exist. The lack of vendor patching increases exposure time. European organizations in sectors such as government, media, and e-commerce that rely on PublicCMS for content management may face operational and reputational damage if exploited. Additionally, compliance with GDPR and other data protection regulations could be jeopardized if sensitive data is exposed.

1. Restrict administrative access to the CMS by enforcing strong authentication mechanisms, including multi-factor authentication (MFA) for all users with high privileges. 2. Implement network-level access controls such as IP whitelisting or VPN requirements to limit access to the administrative interface. 3. Apply strict input validation and sanitization on all file path parameters within the CMS, if possible through custom rules or web application firewalls (WAFs). 4. Monitor logs for unusual file access patterns or attempts to traverse directories. 5. Regularly audit user privileges to ensure only necessary users have high-level access. 6. Backup CMS data and configuration regularly to enable recovery in case of compromise. 7. Engage with the vendor or community for updates or patches; consider upgrading to a fixed version once available. 8. If patching is not immediately possible, consider isolating the CMS environment or deploying compensating controls such as containerization or sandboxing to limit impact.