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CVE-2026-57296 high CVSS 8.8

Path Traversal in org.jenkins-ci.plugins:external-workspace-manager (CVE-2026-57296)

Summary

Path traversal in org.jenkins-ci.plugins:external-workspace-manager (CVE-2026-57296). Successful exploitation can lead to full system takeover. Exploitable via exwsAllocate. Mitigation: upgrade to 1.4.0 or later.

Original description

The description as published by the source.

Jenkins External Workspace Manager Plugin 1.3.2 and earlier does not reject .. path segments when validating the custom workspace path provided to the exwsAllocate Pipeline step, allowing the resulting workspace path to escape the configured disk mount point.

This allows attackers with Item/Configure permission to read arbitrary files on the Jenkins controller file system, which can lead to remote code execution (see Reading Files).

External Workspace Manager Plugin 1.4.0 rejects .. path segments when validating the custom workspace path, and additionally verifies that the requested path is contained within the configured disk mount point before serving it through the external workspace browse functionality.

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-2026-57296 has been found in org.jenkins-ci.plugins:external-workspace-manager.
Attackers can target a specific entry point like exwsAllocate over the network to misuse the product.
Successful exploitation can lead to full system takeover. CVSS score: 8.8/10.
What to do: upgrade org.jenkins-ci.plugins:external-workspace-manager to 1.4.0 or later.
If unsure, ask your IT team or search "org.jenkins-ci.plugins:external-workspace-manager CVE-2026-57296" on the vendor's site.

CVE-2026-57296 (org.jenkins-ci.plugins:external-workspace-manager) — CWE-22 / CVSS v3 8.8
Attack vector: remote (network-reachable) / no user interaction
Attack surface: exwsAllocate
Patched: 1.4.0 — 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.

❓ What is the problem

Path traversal (CWE-22) exists in org.jenkins-ci.plugins:external-workspace-manager. Attackers reach the vulnerable code path via exwsAllocate.

📍 Affected scope

Check the vendor advisory for the affected versions of org.jenkins-ci.plugins:external-workspace-manager. Attack surface: exwsAllocate.

🔥 Severity

Severity: High (CVSS 8.8/10). Successful exploitation can lead to full system takeover.

🔧 How to fix

Update to 1.4.0.

🛡️ 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. 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.jenkins-ci.plugins:external-workspace-manager を使っているサービスとバージョンを洗い出す。

  2. 2
    Apply patch patch 
    Upgrade org.jenkins-ci.plugins:external-workspace-manager to 1.4.0

    ステージング環境で 1.4.0 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を含めること。

  3. 3
    Post-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。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

maven org.jenkins-ci.plugins:external-workspace-manager
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.4.0"}]}]

References

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