id: CVE-2021-38751 info: name: ExponentCMS <= 2.6 - Host Header Injection author: dwisiswant0 severity: medium description: An HTTP Host header attack exists in ExponentCMS 2.6 and below in /exponent_constants.php. A modified HTTP header can change links on the webpage to an arbitrary value,leading to a possible attack vector for MITM. reference: - https://nvd.nist.gov/vuln/detail/CVE-2021-38751 - https://github.com/exponentcms/exponent-cms/issues/1544 - https://github.com/exponentcms/exponent-cms/blob/a9fa9358c5e8dc2ce7ad61d7d5bea38505b8515c/exponent_constants.php#L56-L64 classification: cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N cvss-score: 4.3 cve-id: CVE-2021-38751 cwe-id: CWE-116 tags: cve,cve2021,exponentcms requests: - method: GET path: - "{{BaseURL}}" headers: Host: "{{randstr}}.tld" matchers-condition: and matchers: - type: word words: - '{{randstr}}.tld' - 'EXPONENT.PATH' - 'EXPONENT.URL' part: body condition: and - type: status status: - 200 # Enhanced by mp on 2022/03/23