CVE-2026-107019 in Arbeitszeiterfassung2
Summary
by MITRE • 10/29/2026
Insecure permissions in the feiertage.ImportActivity component of Arbeitszeiterfassung2 versionCode 159 allows unauthorized attackers to create forged holiday/work-time entries via crafted ICS imports.
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Analysis
by VulDB Data Team • 10/29/2026
The vulnerability identified within the feiertage.ImportActivity component of the Arbeitszeiterfassung2 application, specifically in version code 159, represents a critical failure in access control and input validation mechanisms. This flaw stems from insecure permissions that allow unauthorized actors to interact with the holiday and work-time import functionality without proper authentication or authorization checks. By exploiting this weakness, an attacker can bypass standard security protocols designed to restrict who may modify sensitive employee data records. The core technical issue lies in the application's failure to verify the identity and privileges of the user initiating the ICS (iCalendar) file upload process, effectively treating any incoming request as valid regardless of its source or intent.
From a technical perspective, this vulnerability enables attackers to inject forged entries into the system by crafting malicious ICS files that are processed directly by the vulnerable component. Since the import activity does not adequately validate the permissions of the caller, it accepts and executes these crafted inputs without raising alarms or requiring additional verification steps. This lack of integrity checking allows for the manipulation of critical time-tracking data, which is often linked to payroll systems, attendance monitoring, and operational scheduling. The ability to create false holiday records or alter work-time entries can lead to significant discrepancies in employee hours logged versus actual labor performed, creating a direct avenue for fraud or disruption of business operations.
The operational impact of this vulnerability extends beyond simple data corruption. It compromises the integrity of human resources processes that rely on accurate time and attendance tracking. Unauthorized creation of holiday entries could result in employees receiving pay for days they did not work while being marked as absent, leading to financial loss for the organization. Conversely, forged negative adjustments could unfairly penalize employees or trigger incorrect disciplinary actions based on fabricated absence records. Furthermore, such manipulation undermines trust in internal systems and may violate compliance requirements related to data integrity and audit trails, particularly in industries with strict regulatory oversight regarding employee timekeeping and payroll accuracy.
This type of flaw is commonly categorized under CWE-269: Improper Privilege Control, as it involves a failure to enforce appropriate access rights for specific functions within the application. Additionally, from an offensive security perspective, this vulnerability aligns with MITRE ATT&CK techniques related to Defense Evasion and Impact, specifically those involving data manipulation or injection attacks that bypass existing controls. The exploitation of insecure permissions in file import modules is a known attack vector where attackers leverage trusted components to execute unauthorized actions within the application's context.
To mitigate this risk, developers must implement strict access control checks at the entry point of the feiertage.ImportActivity component. This includes verifying user authentication tokens and ensuring that only authorized roles with explicit permission to manage holiday or work-time data can trigger import operations. Input validation should also be strengthened to sanitize any ICS files before processing, checking for malformed structures or suspicious content patterns that might indicate an attack attempt. Implementing role-based access control (RBAC) ensures that functional boundaries are respected and prevents lower-privileged users from accessing administrative features. Regular security audits and penetration testing focused on file upload mechanisms can help identify similar weaknesses in other parts of the application before they are exploited in production environments.