Vulnerability in go.senan.xyz/gonic (CVE-2026-49338)
Summary
Vulnerability in go.senan.xyz/gonic (CVE-2026-49338). Data can be tampered with by attackers. Exploitable via GET /rest/deletePlaylist.view. Mitigation: upgrade to 0.21.0 or later.
Original description
The description as published by the source.
gonic is a music streaming server / free-software subsonic server API implementation. Prior to version 0.21.0, 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 delete any playlist owned by any other user (including admin) by passing its id and 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("/.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. The issue was fixed in commit 6dd71e6a3c966867ef8c900d359a7df75789f410, which is part of version 0.21.0.
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-49338 has been found in go.senan.xyz/gonic.
Attackers can target a specific entry point like GET /rest/deletePlaylist.view over the network to misuse the product.
Data can be tampered with by attackers. CVSS score: 7.1/10.
What to do: upgrade go.senan.xyz/gonic to 0.21.0 or later.
If unsure, ask your IT team or search "go.senan.xyz/gonic CVE-2026-49338" on the vendor's site.
CVE-2026-49338 (go.senan.xyz/gonic) — CWE-285 / CVSS v3 7.1
Attack vector: remote (network-reachable) / no user interaction
Attack surface: GET /rest/deletePlaylist.view / userID / playlistId / ServeUpdatePlaylist
Patched: 0.21.0 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-285) exists in go.senan.xyz/gonic. Attackers reach the vulnerable code path via GET /rest/deletePlaylist.view.
Check the vendor advisory for the affected versions of go.senan.xyz/gonic. Attack surface: GET /rest/deletePlaylist.view / userID / playlistId / ServeUpdatePlaylist.
Severity: High (CVSS 7.1/10). Data can be tampered with by attackers.
Update to 0.21.0.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual GET /rest/deletePlaylist.view requests with malformed payloads or SQL meta-characters. Run grep -r 'go.senan.xyz/gonic' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'go.senan.xyz/gonic' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
go.senan.xyz/gonicを grep し、稼働しているサービス・バージョンを把握する。 -
2Hunt for indicators of compromise detect
grep 'GET /rest/deletePlaylist.view' /var/log/nginx/access.log | grep -E '(unusual_payload|sqli_pattern)'アクセスログで
GET /rest/deletePlaylist.viewへの異常なリクエスト (不正な認証ヘッダ・SQLメタ文字)を過去 30〜90日分捜索。WAF/SIEM があれば該当パスのアラート発火履歴を確認。 -
3Apply patch patch
Upgrade go.senan.xyz/gonic to 0.21.0ステージング環境で 0.21.0 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスと、Step 2 で見つけた異常検知の続報チェックを含めること。
-
4Post-deployment verification verify
Replay attack against GET /rest/deletePlaylist.view on staging to confirm patch closes the vectorパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番では Step 2 と同じログクエリでアラート再発が無いか継続監視。
Affected packages
References
- advisory github.com
- advisory nvd.nist.gov
- advisory github.com
- package github.com
- patch github.com
- web github.com