Subsonic API: any authenticated user can delete or read any other user's playlist (IDOR)

Exploitation

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

CVSS

7.1 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N

EPSS

• CVE-2026-49338: 0.29% estimated exploitation activity in the next 30 days; percentile 21.48 (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 In gonic, the Subsonic API endpoints /rest/deletePlaylist.view and /rest/getPlaylist.view perform no per-resource authorization. Once authenticated as any user (admin or not), an attacker can: 1. Delete any playlist owned by any other user (including admin) by passing its id. 2. Read the full contents (name, comment, song list) of any other user's private (non-public) playlist by passing its id. The Subsonic playlist id is base64url("<userID/<filename.m3u"). Because filenames are user-supplied or time-derived and the userID is a small integer, IDs are guessable and frequently exposed (e.g. a previously-public playlist that was later made private still has the same ID). This breaks the multi-user trust boundary of gonic: a low-privileged user can wipe an administrator's curated playlists, and a user can exfiltrate any private playlist they obtain an ID for. Status This was originally disclosed to the maintainer by email and has been fixed in commit…

Published by the source

26 Jun 2026, 23:33 UTC

Last modified by the source

26 Jun 2026, 23:33 UTC

Source last checked

26 Oct 2026, 15:24 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-hmgp-w9jm-vp95

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# Patch Next advisory brief: CVE-2026-49338

Advisory: Subsonic API: any authenticated user can delete or read any other user's playlist (IDOR)
IDs: CVE-2026-49338, GHSA-hmgp-w9jm-vp95
Record: https://patchnext.com/advisories/cve-2026-49338 (revision 1, source checked 26 Oct 2026, 15:24 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: go.senan.xyz/gonic 0.21.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go go.senan.xyz/gonic: affected <= 0.20.1; fixed in 0.21.0

## Suggested inspection (read-only)
- Go go.senan.xyz/gonic: check the installed version with your package manager.

## 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 go.senan.xyz/gonic.
- 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://github.com/advisories/GHSA-hmgp-w9jm-vp95 (GitHub-reviewed advisory GHSA-hmgp-w9jm-vp95 lists affected ranges: Go go.senan.xyz/gonic >=0 <=0.20.1)

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