{"id":"CVE-2020-26768","aliases":["EUVD-2022-5546","GHSA-wc29-h54q-q8qx"],"status":"published","title":"Formstone Vulnerable to Reflected XSS","description":"Formstone \u003c=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.","severity":{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.01277,"percentile":0.70203,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-79"],"published":"2021-01-07T12:43:12Z","modified":"2026-10-20T10:54:20Z","fixes":[{"ecosystem":"npm","package":"formstone","fixed_in":["1.4.17"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"formstone","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"1.4.16"},{"fixed":"1.4.17"}]}]},{"source":"osv","ecosystem":"npm","package":"formstone","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.4.17"}]}]}],"products":[{"vendor":"formstone","product":"formstone"}],"references":[{"url":"https://github.com/Formstone/Formstone/issues/286","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-26768","tags":["advisory"]},{"url":"https://github.com/Formstone/Formstone/commit/b067f31f5f6a0acd3ade4fd6dccae6e3633caa02","tags":["web"]},{"url":"https://github.com/advisories/GHSA-wc29-h54q-q8qx"}],"sources":{"cve":[{"id":"CVE-2020-26768","description":"Formstone \u003c=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.","status":"published","published":"2021-01-07T12:43:12Z","modified":"2024-08-04T16:03:22.593Z","updated_at":"2026-11-02T14:35:46.129376Z"}],"euvd":[{"id":"EUVD-2022-5546","description":"Formstone \u003c=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.","status":"published","published":"2021-01-07T12:43:12Z","modified":"2024-08-04T16:03:22Z","updated_at":"2026-11-03T03:07:14.105511Z"}],"ghsa":[{"id":"GHSA-wc29-h54q-q8qx","title":"Formstone Vulnerable to Reflected XSS","description":"Formstone \u003c=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.","status":"published","published":"2022-05-24T17:38:12Z","modified":"2024-04-01T22:02:55Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:37:42.744468Z"}],"nvd":[{"id":"CVE-2020-26768","description":"Formstone \u003c=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.","status":"published","published":"2021-01-07T13:15:11.623Z","modified":"2026-06-17T03:08:20.77Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:N/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:06:28.892872Z"}],"osv":[{"id":"CVE-2020-26768","description":"Formstone \u003c=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.","status":"published","published":"2021-01-07T13:15:11.623Z","modified":"2026-10-20T10:54:20.081228961Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:16.248747Z"},{"id":"GHSA-wc29-h54q-q8qx","title":"Formstone Vulnerable to Reflected XSS","description":"Formstone \u003c=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.","status":"published","published":"2022-05-24T17:38:12Z","modified":"2024-04-01T22:27:14.842993Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:46:58.401149Z"}]}}