{"id":"CVE-2021-27786","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-27786","generatedAt":"2026-10-27T22:25:37.774Z","title":"This request has an Origin header that identifies the domain that is making the initial request and defines the protocol between a browser and server to see if the request is allowed.","description":"Cross-origin resource sharing (CORS) enables browsers to perform cross domain requests in a controlled manner. This request has an Origin header that identifies the domain that is making the initial request and defines the protocol between a browser and server to see if the request is allowed. An attacker can take advantage of this and possibly carry out privileged actions and access sensitive information when the Access-Control-Allow-Credentials is enabled.","published":"2022-06-09T17:15:09.000Z","lastModified":"2026-06-17T03:45:27.000Z","status":"Modified","sourceIdentifier":"psirt@hcl.com","cvss":{"version":"3.1","score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-942","CWE-697"],"affected":["hcltech/onetest server"],"epss":{"score":0.00583,"percentile":0.47608,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.58%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://support.hcltechsw.com/csm?id=kb_article&sysparm_article=KB0098603","tags":["Vendor Advisory"],"source":"psirt@hcl.com"},{"url":"https://support.hcltechsw.com/csm?id=kb_article&sysparm_article=KB0098603","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-27786","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}