CVE-2026-102539 in Super Productivity
Summary
by MITRE • 10/13/2026
Super Productivity is an advanced todo list app with integrated timeboxing and time tracking capabilities. From 17.3.0 until 18.13.1, the SuperSync end-to-end encryption setup calls sync(true) before a user sets an encryption password, causing the operation-upload path to transmit and store all user operations in plaintext. The exposed operations can include private task content and connected issue-provider credentials, including reusable passwords, API tokens, and app passwords. Users who complete E2EE setup have the plaintext operations deleted, while users who leave the password-setting step can leave the data stored indefinitely. The Disable SuperSync action did not remove plaintext that had already been uploaded. Routing and causal metadata remain plaintext by design and are not part of this vulnerability. This issue is fixed in version 18.13.1.
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Analysis
by VulDB Data Team • 10/13/2026
The vulnerability identified in Super Productivity versions ranging from 17.3.0 to 18.13.1 represents a critical failure in the implementation of end-to-end encryption for its synchronization service, known as SuperSync. This application is designed to help users manage tasks with integrated timeboxing and tracking features, relying on secure data synchronization across devices. The core technical flaw lies in the initialization sequence of the encryption setup process. Specifically, during the configuration phase where a user establishes an encryption password, the system prematurely invokes the sync operation before the cryptographic keys are generated or the password is set. This sequencing error results in the application transmitting and storing all pending user operations on the remote server in plaintext rather than encrypting them first. Consequently, sensitive data that should have been protected by end-to-end encryption remains exposed to potential interception or unauthorized access during this window of vulnerability.
The operational impact of this flaw is severe due to the nature of the data involved. The unprotected transmission includes not only private task content but also highly sensitive credentials associated with connected issue providers. These credentials often include reusable passwords, API tokens, and application-specific passwords that grant access to external services such as Jira or GitHub. If an attacker gains access to the synchronization server or intercepts network traffic during this phase, they can extract these credentials, leading to potential account takeovers, data exfiltration, and further compromise of connected systems. The risk is exacerbated for users who initiate the encryption setup but fail to complete it by setting a password; in such cases, the plaintext operations remain stored on the server indefinitely rather than being deleted or encrypted later. Furthermore, even if a user successfully completes the end-to-end encryption setup, any data that was already uploaded during the vulnerable window is not automatically removed from the server unless the user explicitly disables SuperSync, and even then, existing plaintext records may persist depending on implementation details regarding cleanup procedures.
This vulnerability aligns with CWE-319, which describes cleartext transmission of sensitive information over a network channel that is susceptible to eavesdropping. Additionally, it reflects weaknesses in cryptographic key management as defined by CWE-757, specifically the failure to use encryption during data transfer when required for confidentiality. From an adversary perspective, this scenario facilitates Credential Access and potentially Data Exfiltration via remote services, mapping closely to ATT&CK techniques related to intercepting unencrypted communications or exploiting misconfigured security controls in cloud-based synchronization mechanisms. The routing and causal metadata remain plaintext by design as part of the application's architecture for functionality purposes, but they do not constitute a vulnerability since they are intended to be visible to the server for operational reasons.
To mitigate this risk, users must upgrade immediately to version 18.13.1 or later, where the synchronization logic has been corrected to ensure encryption occurs prior to any data transmission during the setup phase. For organizations deploying Super Productivity, it is advisable to audit existing configurations and enforce strict policies regarding the completion of security setups before allowing sync operations. Additionally, users who suspect their data may have been exposed should rotate all affected credentials immediately, including API tokens and passwords for connected issue providers, as previous exposure cannot be fully mitigated by simply enabling encryption later in the process. Regular updates to third-party productivity tools are essential to maintain the integrity of sensitive workflow data and prevent unauthorized access through implementation flaws in security features.