{"id":"CVE-2021-42841","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-42841","generatedAt":"2026-10-27T17:44:55.178Z","title":"Insta HMS before 12.4.10 is vulnerable to XSS because of improper validation of user-supplied input by multiple scripts.","description":"Insta HMS before 12.4.10 is vulnerable to XSS because of improper validation of user-supplied input by multiple scripts. A remote attacker could exploit this vulnerability via a crafted URL to execute script in a victim's Web browser within the security context of the hosting Web site, once the URL is clicked. An attacker could use this vulnerability to steal the victim's cookie-based authentication credentials.","published":"2022-01-06T21:15:08.000Z","lastModified":"2026-06-17T04:10:12.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.1","score":6.1,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},"cwe":["CWE-79"],"affected":["practo/insta hms"],"epss":{"score":0.00852,"percentile":0.5798,"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":"low","text":"Lower severity and a low EPSS score (0.85%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/210416","tags":["Third Party Advisory","VDB Entry"],"source":"cve@mitre.org"},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/210416","tags":["Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-42841","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."}