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CVE-2026-55547 medium CVSS 4.3

Vulnerability in org.yamcs:yamcs-core (CVE-2026-55547)

Summary

Vulnerability in org.yamcs:yamcs-core (CVE-2026-55547). Risk of unauthorized operations or information disclosure. Exploitable via GET /api/roles. Mitigation: upgrade to 5.12.8 or later.

Original description

The description as published by the source.

Summary

Missing authorization checks on three IAM API endpoints (GET /api/roles, GET /api/roles/{name}, GET /api/privileges) allow any authenticated user — regardless of their assigned permissions — to enumerate the complete list of system privileges and role definitions. An attacker with only a low-privilege account (e.g., a read-only operator) can retrieve the full privilege taxonomy of the server, including the names and assignments of all administrator-level capabilities. This information directly enables targeted privilege escalation attacks.

Details

Three handler methods in IamApi.java serve sensitive security metadata without performing any authorization check:

File: yamcs-core/src/main/java/org/yamcs/http/api/IamApi.java

// Line 73 — GET /api/roles
@Override
public void listRoles(Context ctx, Empty request, Observer observer) {
    SecurityStore securityStore = YamcsServer.getServer().getSecurityStore();
    List roles = securityStore.getDirectory().getRoles();
    // No ctx.checkSystemPrivilege() call — any authenticated user proceeds
    ...
    observer.complete(responseb.build());
}

// Line 87 — GET /api/roles/{name}
@Override
public void getRole(Context ctx, GetRoleRequest request, Observer observer) {
    SecurityStore securityStore = YamcsServer.getServer().getSecurityStore();
    Role role = securityStore.getDirectory().getRole(request.getName());
    // No ctx.checkSystemPrivilege() call
    observer.complete(toRoleInfo(…

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-2026-55547 has been found in org.yamcs:yamcs-core.
Attackers can target a specific entry point like GET /api/roles over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 4.3/10.
What to do: upgrade org.yamcs:yamcs-core to 5.12.8 or later.
If unsure, ask your IT team or search "org.yamcs:yamcs-core CVE-2026-55547" on the vendor's site.

CVE-2026-55547 (org.yamcs:yamcs-core) — CWE-285 / CVSS v3 4.3
Attack vector: remote (network-reachable) / no user interaction
Attack surface: GET /api/roles / GET /api/roles/{name} / GET /api/privileges / GET /api/users
Patched: 5.12.8 — 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-285) exists in org.yamcs:yamcs-core. Attackers reach the vulnerable code path via GET /api/roles.

📍 Affected scope

Check the vendor advisory for the affected versions of org.yamcs:yamcs-core. Attack surface: GET /api/roles / GET /api/roles/{name} / GET /api/privileges / GET /api/users.

🔥 Severity

Severity: Medium (CVSS 4.3/10). Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to 5.12.8.

🛡️ 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 GET /api/roles requests with malformed payloads or SQL meta-characters. Audit SBOM/dependencies to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    Audit SBOM/dependencies for affected components.

    資産台帳・SBOM・依存マニフェストで org.yamcs:yamcs-core を使っているサービスとバージョンを洗い出す。

  2. 2
    Hunt for indicators of compromise detect 
    grep 'GET /api/roles' /var/log/nginx/access.log | grep -E '(unusual_payload|sqli_pattern)'

    アクセスログで GET /api/roles 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。

  3. 3
    Apply patch patch 
    Upgrade org.yamcs:yamcs-core to 5.12.8

    ステージング環境で 5.12.8 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。

  4. 4
    Post-deployment verification verify 
    Replay attack against GET /api/roles 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

maven org.yamcs:yamcs-core
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.12.8"}]}]

References

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