CVE-2026-1111 is a path traversal vulnerability identified in Sanluan PublicCMS, specifically affecting versions 5.202506.a through 5.202506.d. The flaw resides in the Save function of the TaskTemplateAdminController.java file, part of the Task Template Management Handler component. The vulnerability allows an attacker to manipulate the 'path' argument, enabling traversal outside the intended directory structure. This can lead to unauthorized reading or writing 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 administrative rights). No user interaction is needed, and the vulnerability has a CVSS 4.0 base score of 5.1, reflecting medium severity due to the requirement for elevated privileges and limited scope of impact. The vendor was notified but has not issued a patch or response, and while no active exploits have been reported, the public disclosure of the exploit code increases the risk of exploitation by threat actors. The vulnerability could compromise the confidentiality, integrity, and availability of the CMS and underlying systems by allowing unauthorized file system access or modification.

For European organizations using Sanluan PublicCMS, this vulnerability poses a risk of unauthorized file access or modification, potentially leading to data breaches, defacement, or disruption of CMS operations. Confidential information stored on the server could be exposed or altered, undermining data integrity. Availability could be impacted if critical files are deleted or corrupted. The requirement for high privileges limits exploitation to insiders or attackers who have already compromised administrative credentials, but this does not eliminate risk, especially in environments with weak access controls or credential management. Given the vendor's lack of response, organizations may face prolonged exposure. This vulnerability could be leveraged in targeted attacks against government, media, or enterprises relying on PublicCMS for web content management, impacting reputation and compliance with data protection regulations such as GDPR.

1. Restrict administrative access to the CMS to trusted personnel and enforce strong authentication mechanisms, including multi-factor authentication. 2. Implement strict access controls and monitor administrative account usage for suspicious activity. 3. Use web application firewalls (WAFs) to detect and block path traversal attempts targeting the vulnerable Save function. 4. Conduct regular file integrity monitoring on the CMS server to detect unauthorized changes. 5. Isolate the CMS environment from critical internal networks to limit lateral movement if exploited. 6. Since no official patch is available, consider temporary compensating controls such as disabling the vulnerable Task Template Management functionality if feasible. 7. Maintain up-to-date backups of CMS data and configuration to enable recovery in case of compromise. 8. Engage with the vendor or community for updates and monitor threat intelligence feeds for emerging exploits or patches.