CVE-2026-3089 is a medium-severity path traversal vulnerability in @actual-app/sync-server (npm), affecting versions <= 26.2.0. It is fixed in 26.3.0.
Description Actual Sync Server allows authenticated users to upload files through POST /sync/upload-user-file. In versions prior to 26.3.0, improper validation of the user-controlled x-actual-file-id header means that traversal segments (../) can escape the intended directory and write files outside userFiles. Mitigations The vulnerability can be mitigated in prior versions by running the sync server in a filesystem sandbox.
Input manipulates file paths to reach files outside the intended directory, such as configuration or credential files. Typical impact: unauthorized file read or write outside the intended directory.
npm
@actual-app/sync-server (<= 26.2.0)@actual-app/sync-server → 26.3.0 (npm)Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter instead of chasing every advisory.
Kodem's runtime-powered SCA identifies whether CVE-2026-3089 is reachable in your applications. Explore open-source security for your team.
See if CVE-2026-3089 is reachable in your applications. Get a demo
Already deployed Kodem? See CVE-2026-3089 in your environment →Upgrade @actual-app/sync-server to 26.3.0 or later to resolve this vulnerability.
Kodem Kai can prioritize this vulnerability in your dependency tree and generate a fix recommendation.
CVE-2026-3089 is a medium-severity path traversal vulnerability in @actual-app/sync-server (npm), affecting versions <= 26.2.0. It is fixed in 26.3.0. Input manipulates file paths to reach files outside the intended directory, such as configuration or credential files.
@actual-app/sync-server (npm) versions <= 26.2.0 is affected.
Yes. CVE-2026-3089 is fixed in 26.3.0. Upgrade to this version or later.
Whether CVE-2026-3089 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
Upgrade @actual-app/sync-server to 26.3.0 or later.