# CVE-2026-63640: MagicMirror socket payload secret placeholder expansion

Source: https://junglewise.ai/threats/cve-2026-63640-magicmirror-socket-payload-secret-placeholder-expansion  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-18. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-63640 · Severity: medium · CVSS 4.3 · Published 2026-08-18

MagicMirror is a modular display platform that supports Socket.IO-based communication between modules. When the hideConfigSecrets feature is enabled to protect sensitive environment variables, the application incorrectly expands SECRET_* placeholder references in inbound socket messages. An attacker with access to a module namespace can send specially crafted messages containing placeholders like **SECRET_API_KEY** to retrieve the actual environment variable values and potentially leak API tokens, credentials, or other secrets stored in the server configuration.

Technologies: [MagicMirrorOrg MagicMirror²](https://junglewise.ai/threats/technologies/magicmirror), [magicmirror (npm)](https://junglewise.ai/threats/technologies/npm-magicmirror). Vendors: [MagicMirrorOrg](https://junglewise.ai/threats/vendors/magicmirrororg), [npm](https://junglewise.ai/threats/vendors/npm).

## Quick answers

**Is CVE-2026-63640 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-63640 being exploited in the wild.

**How severe is CVE-2026-63640?** Medium severity, with a CVSS score of 4.3, published 18 August 2026.

**Which products and versions are affected?** MagicMirrorOrg MagicMirror² <2.37.0; magicmirror (npm) SEMVER:introduced=0,fixed=2.37.0.

**Is there a fix for CVE-2026-63640?** Yes. magicmirror (npm): upgrade to 2.37.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-63640 attacked?** It is attacked from the adjacent network or over the network, in a software library.

**Am I affected by CVE-2026-63640?** Check whether you run MagicMirrorOrg MagicMirror² or magicmirror (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- magicmirror (npm): upgrade to 2.37.0 or later

  ```sh
  npm install magicmirror@2.37.0
  ```


## Technical details

The vulnerability exists in the Socket.IO message dispatcher within js/node_helper.js, which calls replaceSecretPlaceholder() on every inbound socket payload to expand **SECRET_*** placeholders into their real environment variable values before passing data to module handlers. Although the /config HTTP endpoint correctly redacts these placeholders when hideConfigSecrets: true is set, the socket dispatcher reverses this boundary by re-expanding them in inbound client messages. The root cause is in js/server_functions.js:23-34, which replaces **SECRET_NAME** patterns with process.env[...] values. An unauthenticated attacker with network access to a Socket.IO module namespace can craft payloads containing known or guessed SECRET_* variable names. Default module helpers like the weather module echo attacker-controlled fields in error responses, enabling secret exfiltration. The vulnerability requires knowledge of the SECRET_* variable name and depends on network reachability to the Socket.IO service. Fixed in version 2.37.0 by removing placeholder expansion from inbound socket payloads.

## Affected products

- MagicMirrorOrg MagicMirror <2.37.0

## Identifiers

- CVE-2026-63640
- GHSA-q4gh-4ffp-5cg8

## Timeline

- 2026-07-01: disclosed
- 2026-07-01: patched: Patched in version 2.37.0
- 2026-08-18: advisory

## References

- [https://api.github.com/users/sondt99](https://api.github.com/users/sondt99)
- [https://github.com/sondt99](https://github.com/sondt99)
- [https://api.github.com/users/sondt99/gists%7B/gist_id%7D](https://api.github.com/users/sondt99/gists%7B/gist_id%7D)
- [https://api.github.com/users/sondt99/repos](https://api.github.com/users/sondt99/repos)
- [https://avatars.githubusercontent.com/u/87920408?v=4](https://avatars.githubusercontent.com/u/87920408?v=4)
- [https://api.github.com/users/sondt99/events%7B/privacy%7D](https://api.github.com/users/sondt99/events%7B/privacy%7D)

## Related threats

- [MagicMirror server-side request forgery in calendar module](https://junglewise.ai/threats/cve-2026-63643-magicmirror-server-side-request-forgery-in-calendar-module)
- [MagicMirror newsfeed server-side request forgery in CHECK_ARTICLE_URL](https://junglewise.ai/threats/cve-2026-63642-magicmirror-newsfeed-server-side-request-forgery-in-check-article)
- [MagicMirror Socket.IO auth bypass allows unauthenticated module commands](https://junglewise.ai/threats/cve-2026-63641-magicmirror-socket-io-auth-bypass-allows-unauthenticated-module)
- [MagicMirrorOrg MagicMirror² SSRF and secret exfiltration in /cors endpoint](https://junglewise.ai/threats/cve-2026-42281-magicmirrororg-magicmirror-ssrf-and-secret-exfiltration-in-cors)