{"id":"CVE-2020-26768","aliases":["GHSA-wc29-h54q-q8qx"],"url":"https://o3.security/vulnerability/CVE-2020-26768","summary":"Formstone Vulnerable to Reflected XSS","details":"Formstone <=1.4.16 is vulnerable to a Reflected Cross-Site Scripting (XSS) vulnerability caused by improper validation of user supplied input in the upload-target.php and upload-chunked.php files. A remote attacker could exploit this vulnerability using a specially crafted URL to execute a script in a victim's Web browser within the security context of the hosting Web site once the URL is clicked or visited. An attacker could use this vulnerability to steal the victim's cookie-based authentication credentials, force malware execution, user redirection and others.","published":"2021-01-07T13:15:11.623Z","modified":"2026-07-08T17:57:13.775429Z","cvss":{"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"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"formstone","fixedVersion":"1.4.17"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/Formstone/Formstone/issues/286"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T17:57:13.775429Z"}}