{"id":"CVE-2020-26574","aliases":["EUVD-2020-19119","GHSA-fgqf-9xqq-px3h"],"status":"published","title":"** UNSUPPORTED WHEN ASSIGNED ** Leostream Connection Broker 8.2.x is affected by stored XSS. An...","description":"Leostream Connection Broker 8.2.x is affected by stored XSS. An unauthenticated attacker can inject arbitrary JavaScript code via the webquery.pl User-Agent HTTP header. It is rendered by the admins the next time they log in. The JavaScript injected can be used to force the admin to upload a malicious Perl script that will be executed as root via libMisc::browser_client. NOTE: This vulnerability only affects products that are no longer supported by the maintainer","severity":{"version":"3.1","score":9.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.02119,"percentile":0.82019,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79"],"published":"2020-10-06T14:32:24Z","modified":"2026-06-17T03:08:13Z","products":[{"vendor":"leostream","product":"connection_broker"}],"references":[{"url":"https://adepts.of0x.cc/leostream-xss-to-rce/","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory"]},{"url":"https://www.leostream.com/resources/product-lifecycle/","tags":["x_refsource_MISC","x_transferred","Release Notes","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-26574"},{"url":"https://adepts.of0x.cc/leostream-xss-to-rce"},{"url":"https://www.leostream.com/resources/product-lifecycle"},{"url":"https://github.com/advisories/GHSA-fgqf-9xqq-px3h"}],"sources":{"cve":[{"id":"CVE-2020-26574","description":"Leostream Connection Broker 8.2.x is affected by stored XSS. An unauthenticated attacker can inject arbitrary JavaScript code via the webquery.pl User-Agent HTTP header. It is rendered by the admins the next time they log in. The JavaScript injected can be used to force the admin to upload a malicious Perl script that will be executed as root via libMisc::browser_client. NOTE: This vulnerability only affects products that are no longer supported by the maintainer","status":"published","published":"2020-10-06T14:32:24Z","modified":"2024-08-04T15:56:04.982Z","updated_at":"2026-11-02T14:35:46.129376Z"}],"euvd":[{"id":"EUVD-2020-19119","description":"Leostream Connection Broker 8.2.x is affected by stored XSS. An unauthenticated attacker can inject arbitrary JavaScript code via the webquery.pl User-Agent HTTP header. It is rendered by the admins the next time they log in. The JavaScript injected can be used to force the admin to upload a malicious Perl script that will be executed as root via libMisc::browser_client. NOTE: This vulnerability only affects products that are no longer supported by the maintainer","status":"published","published":"2020-10-06T14:32:24Z","modified":"2024-08-04T15:56:04Z","updated_at":"2026-11-03T03:07:15.15938Z"}],"ghsa":[{"id":"GHSA-fgqf-9xqq-px3h","title":"** UNSUPPORTED WHEN ASSIGNED ** Leostream Connection Broker 8.2.x is affected by stored XSS. An...","description":"** UNSUPPORTED WHEN ASSIGNED ** Leostream Connection Broker 8.2.x is affected by stored XSS. An unauthenticated attacker can inject arbitrary JavaScript code via the webquery.pl User-Agent HTTP header. It is rendered by the admins the next time they log in. The JavaScript injected can be used to force the admin to upload a malicious Perl script that will be executed as root via libMisc::browser_client. NOTE: This vulnerability only affects products that are no longer supported by the maintainer.","status":"published","published":"2022-05-24T17:30:12Z","modified":"2024-03-30T05:01:43Z","cvss":[{"version":"3.1","score":9.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:55:44.65747Z"}],"nvd":[{"id":"CVE-2020-26574","description":"Leostream Connection Broker 8.2.x is affected by stored XSS. An unauthenticated attacker can inject arbitrary JavaScript code via the webquery.pl User-Agent HTTP header. It is rendered by the admins the next time they log in. The JavaScript injected can be used to force the admin to upload a malicious Perl script that will be executed as root via libMisc::browser_client. NOTE: This vulnerability only affects products that are no longer supported by the maintainer","status":"published","published":"2020-10-06T15:15:15.49Z","modified":"2026-06-17T03:08:13.633Z","cvss":[{"version":"3.1","score":9.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":9.3,"vector":"AV:N/AC:M/Au:N/C:C/I:C/A:C","level":"high","assessor":"primary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:06:17.70091Z"}]}}