A critical vulnerability in Appsmith tracked as CVE-2026-24042 (CVSS 9.4) allows unauthenticated users to execute unpublished (edit-mode) actions in publicly accessible Appsmith applications. The issue is described as a viewMode confusion flaw: public viewers should only be able to run published actions, but an attacker can bypass this boundary by sending viewMode=false (or omitting the parameter) when calling POST /api/v1/actions/execute.
Successful exploitation can expose sensitive development logic and data by enabling execution of edit-mode queries/APIs that were not intended for public use, including potential access to development data sources. Reported impacts include data leakage and the ability to trigger side effects such as write operations or external API calls. Affected versions are reported as Appsmith 1.94 and below, and at the time of reporting one source indicated no released fix yet.

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2 events from the most recent confirmed update back to the earliest known activity.
By the time of later reporting, Appsmith had released a fix for CVE-2026-24042 and advised users to upgrade to version 1.95 or later. This changed the status from an unfixed critical disclosure to a patched vulnerability.
Appsmith versions 1.94 and below were found to contain an access-control issue in publicly accessible apps that lets unauthenticated users execute unpublished edit-mode actions by setting viewMode=false or omitting the parameter on the actions execution endpoint. The flaw could expose sensitive data, trigger edit-mode queries and APIs, and cause unintended side effects.
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