CVE-2025-11853 is a vulnerability identified in the Sismics Teedy document management system, specifically affecting all versions up to 1.11. The flaw resides in the /api/file endpoint of the API component, where improper access control mechanisms allow remote attackers to bypass intended restrictions. This vulnerability does not require authentication or user interaction, making it easier to exploit remotely. Attackers can manipulate API requests to gain unauthorized access to files or data managed by Teedy, potentially leading to data leakage or unauthorized data modification. The vulnerability has been publicly disclosed, increasing the risk of exploitation, but no patches or vendor responses have been provided as of the publication date. The CVSS 4.0 vector indicates network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:L - low privileges), no user interaction (UI:N), and impacts on confidentiality, integrity, and availability at low levels (VC:L, VI:L, VA:L). The lack of vendor remediation and public exploit details necessitate immediate attention from users of this software. The vulnerability's scope is limited to Teedy installations, but given Teedy's use in document management, the impact on confidentiality and integrity of sensitive documents can be significant.

The improper access control vulnerability in Teedy can lead to unauthorized access to sensitive documents and data stored within the system. This can result in data breaches, exposure of confidential information, and potential data tampering. Organizations relying on Teedy for document management face risks to confidentiality, integrity, and availability of their data. The medium severity rating reflects moderate impact; however, the ease of remote exploitation without authentication increases the threat level. If exploited, attackers could access or modify files they should not have permissions for, potentially disrupting business operations or violating compliance requirements. The absence of vendor patches and the public disclosure of exploit details heighten the risk of active exploitation attempts. Organizations with sensitive or regulated data stored in Teedy are particularly vulnerable, and the impact could extend to reputational damage and legal consequences.

Organizations should immediately assess their use of Sismics Teedy versions 1.0 through 1.11 and consider the following mitigations: 1) Restrict network access to the Teedy API endpoint (/api/file) by implementing firewall rules or network segmentation to limit exposure to trusted internal networks only. 2) Employ Web Application Firewalls (WAFs) with custom rules to detect and block suspicious API requests targeting access control bypass attempts. 3) Monitor logs for unusual access patterns or unauthorized API calls to detect potential exploitation attempts early. 4) If possible, disable or restrict the vulnerable API endpoint until a vendor patch or official fix is available. 5) Consider migrating to alternative document management solutions with active security support if vendor remediation is not forthcoming. 6) Implement strict access controls and least privilege principles on the server hosting Teedy to minimize damage in case of exploitation. 7) Regularly back up critical data to enable recovery from potential data integrity attacks. 8) Stay updated on vendor announcements or community patches and apply them promptly once available.