Swing Music has a Directory Traversal & Filesystem can be accessed by a non-admin user

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

5.3 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N · score source

EPSS

• CVE-2026-23877: 0.60% estimated exploitation activity in the next 30 days; percentile 48.49 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary Swing Music's listfolders() function in the /folder/dir-browser endpoint is vulnerable to directory traversal attacks. Any authenticated user (including non-admin) can browse arbitrary directories on the server filesystem. Details The @api.post("/dir-browser") endpoint lacks proper path validation and authorization checks: - No authorization requirement: Any authenticated user can access the endpoint - Improper path handling: The code attempts to prepend "/" to non-existent paths but this doesn't prevent traversal: PoC 1. Create a non-admin user 2. Authenticate as a non-admin user 3. Send the following request: 4. The response will list directories from /proc/self instead of restricting to user-accessible paths: Impact Information Disclosure: - Server filesystem structure and layout - Configuration file locations and names - User account names from directory listings - Software versions and installed packages - Log file locations and system paths Additional Risks: -…

Published by the source

21 Jan 2026, 01:02 UTC

Last modified by the source

7 Jul 2026, 17:56 UTC

Source last checked

26 Oct 2026, 13:36 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-pj88-9xww-gxmh

2. Revision 2 · amended · 25 Oct 2026

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

3. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-pj88-9xww-gxmh

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# Patch Next advisory brief: CVE-2026-23877

Advisory: Swing Music has a Directory Traversal & Filesystem can be accessed by a non-admin user
IDs: CVE-2026-23877, GHSA-pj88-9xww-gxmh
Record: https://patchnext.com/advisories/cve-2026-23877 (revision 3, source checked 26 Oct 2026, 13:36 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: swingmusic 2.1.4. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI swingmusic: affected < 2.1.4; fixed in 2.1.4

## Suggested inspection (read-only)
- `python -m pip show swingmusic`: prints the installed version. Run with the environment that serves production active.

## 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 swingmusic.
- 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-pj88-9xww-gxmh (OSV record GHSA-pj88-9xww-gxmh lists affected ranges: PyPI swingmusic >=0 <2.1.4 (fixed))
- Verified: https://github.com/advisories/GHSA-pj88-9xww-gxmh (GitHub-reviewed advisory GHSA-pj88-9xww-gxmh lists affected ranges: PyPI swingmusic >=0 <2.1.4)

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