Information Disclosure in piccolo-admin (CVE-2026-55485)
Summary
Vulnerability in piccolo-admin (CVE-2026-55485). Successful exploitation can lead to full system takeover. Exploitable via PATCH /api/tables/piccolo_user/2/. Mitigation: upgrade to 1.14.0 or later.
Original description
The description as published by the source.
Summary
piccolo_admin uses a helper called superuser_validators to gate access to the user and session tables for non-superusers. The helper rejects PUT, PATCH, DELETE, and POST, but does not reject GET.
The sessions table stores live session tokens in plaintext, and the token column is not marked secret=True, so it is included in every GET response. Any non-superuser admin can therefore list every other user's live session token with one request, replay the token as their own Cookie: id=…, impersonate that user (including the superuser), and then permanently self-promote by writing superuser = true on their own row.
The chain is reachable on a realistic, documented configuration: a deployer adds the Sessions (and User) tables to create_admin([...]) so superusers have a UI to monitor and revoke sessions.
Affected component
- File:
piccolo_admin/endpoints.py - Function:
superuser_validators(around line 419)
def superuser_validators(piccolo_crud: PiccoloCRUD, request: Request):
user: BaseUser = request.user.user
if not user.superuser:
if request.method.upper() in ["PUT", "PATCH", "DELETE", "POST"]:
raise HTTPException(
detail="Only superusers can perform these actions.",
status_code=405,
)
The method check is a deny-list instead of an allow-list; GET is absent. Compounding the issue, SessionsBase.token in `piccolo_api/…
Source: GitHub Security Advisories (Global) 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-2026-55485 has been found in piccolo-admin.
Attackers can target a specific entry point like PATCH /api/tables/piccolo_user/2/ over the network to misuse the product.
Successful exploitation can lead to full system takeover. CVSS score: 8.8/10.
What to do: upgrade piccolo-admin to 1.14.0 or later.
If unsure, ask your IT team or search "piccolo-admin CVE-2026-55485" on the vendor's site.
CVE-2026-55485 (piccolo-admin) — CWE-200 / CVSS v3 8.8
Attack vector: remote (network-reachable) / no user interaction
Attack surface: PATCH /api/tables/piccolo_user/2/ / GET /api/tables/sessions/ / piccolo_admin / superuser_validators
Patched: 1.14.0 — 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.
Information disclosure (CWE-200) exists in piccolo-admin. Attackers reach the vulnerable code path via PATCH /api/tables/piccolo_user/2/.
Check the vendor advisory for the affected versions of piccolo-admin. Attack surface: PATCH /api/tables/piccolo_user/2/ / GET /api/tables/sessions/ / piccolo_admin / superuser_validators.
Severity: High (CVSS 8.8/10). Successful exploitation can lead to full system takeover.
Update to 1.14.0.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual PATCH /api/tables/piccolo_user/2/ requests with malformed payloads or SQL meta-characters. Run grep -r 'piccolo-admin' . 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 'piccolo-admin' . | 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
piccolo-admin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 'PATCH /api/tables/piccolo_user/2/' /var/log/nginx/access.log | grep -E '(unusual_payload|sqli_pattern)'アクセスログで
PATCH /api/tables/piccolo_user/2/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 piccolo-admin to 1.14.0ステージング環境で 1.14.0 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 PATCH /api/tables/piccolo_user/2/ 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。