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High, CVSS 7.2amended

Kottster app reinitialization can be re-triggered allowing command injection in development mode

CVE-2025-62713GHSA-j3w7-9qc3-g96p

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (@kottster/server 3.3.2), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
7.2 · CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U · score source
EPSS
  • CVE-2025-62713: 0.61% estimated exploitation activity in the next 30 days; percentile 49.21 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Impact Development mode only. Kottster contains a pre-authentication remote code execution (RCE) vulnerability when running in development mode. The vulnerability combines two issues: 1. The initApp action can be called repeatedly without checking if the app is already initialized, allowing attackers to create a new root admin account and obtain a JWT token 2. The installPackagesForDataSource action uses unescaped command arguments, enabling command injection An attacker with access to a locally running development instance can chain these vulnerabilities to: - Reinitialize the application and receive a JWT token for a new root account - Use this token to authenticate - Execute arbitrary system commands through installPackagesForDataSource Production deployments were never affected. Patches Fixed in v3.3.2. Specifically, @kottster/server v3.3.2 and @kottster/cli v3.3.2 address this vulnerability. We recommend developers using earlier versions of @kottster/server and @kottster/cli…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 3 · amended ·

    Amended from ghsa record GHSA-j3w7-9qc3-g96p

  2. Revision 2 · amended ·

    Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

  3. Revision 1 · created ·

    Published from osv record GHSA-j3w7-9qc3-g96p

Agent brief

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# Patch Next advisory brief: CVE-2025-62713

Advisory: Kottster app reinitialization can be re-triggered allowing command injection in development mode
IDs: CVE-2025-62713, GHSA-j3w7-9qc3-g96p
Record: https://patchnext.com/advisories/cve-2025-62713 (revision 3, source checked 26 Oct 2026, 12:38 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.2)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: @kottster/server 3.3.2. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @kottster/server: affected >= 3.2.0, < 3.3.2; fixed in 3.3.2

## Suggested inspection (read-only)
- `npm ls @kottster/server --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on @kottster/server.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-j3w7-9qc3-g96p (OSV record GHSA-j3w7-9qc3-g96p lists affected ranges: npm @kottster/server >=3.2.0 <3.3.2 (fixed))
- Verified: https://github.com/advisories/GHSA-j3w7-9qc3-g96p (GitHub-reviewed advisory GHSA-j3w7-9qc3-g96p lists affected ranges: npm @kottster/server >=3.2.0 <3.3.2)

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