← Back
CVE-2026-55584
high
CVSS 7.5
Vulnerability in phpsysinfo/phpsysinfo (CVE-2026-55584)
Summary
vulnerability in phpsysinfo/phpsysinfo (CVE-2026-55584). Confidential information can be exposed externally. Exploitable via ``PSI_ALLOWED``. Mitigation: upgrade to `3.4.6` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-55584** has been found in phpsysinfo/phpsysinfo.
Attackers can target a specific entry point like ``PSI_ALLOWED`` over the network to misuse the product.
Confidential information can be exposed externally. CVSS score: 7.5/10.
What to do: upgrade phpsysinfo/phpsysinfo to **3.4.6** or later.
If unsure, ask your IT team or search "phpsysinfo/phpsysinfo CVE-2026-55584" on the vendor's site.
CVE-2026-55584 (phpsysinfo/phpsysinfo) — CWE-290 / CVSS v3 7.5
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: `PSI_ALLOWED` / `read_config.php` / `REMOTE_ADDR` / `main`
Patched: `3.4.6` — 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.
❓ What is the problem
**A vulnerability** (CWE-290) exists in phpsysinfo/phpsysinfo. Attackers reach the vulnerable code path via ``PSI_ALLOWED`` without authentication.
📍 Affected scope
phpsysinfo/phpsysinfo — . Attack surface: `PSI_ALLOWED` / `read_config.php` / `REMOTE_ADDR` / `main`.
🔥 Severity
Severity: High (CVSS 7.5/10). Confidential information can be exposed externally
🔧 How to fix
Update to **3.4.6**.
🛡️ Workaround
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
🔍 Detection
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run `grep -r 'phpsysinfo/phpsysinfo' .` against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response Actions (7 steps)
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'phpsysinfo/phpsysinfo' . | 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 `phpsysinfo/phpsysinfo` を grep し、稼働しているサービス・バージョンを把握する。
-
6Apply patch patch
Upgrade phpsysinfo/phpsysinfo to 3.4.6ステージング環境で 3.4.6 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 3 で見つけた異常検知の続報チェックを含めること。
-
7Post-deployment verification verify
Confirm patched version is live in production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 3 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
composer
phpsysinfo/phpsysinfo
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.4.6"}]}]