{"id":"CVE-2020-26574","url":"https://www.cyber-defence.io/tools/cve/CVE-2020-26574","generatedAt":"2026-10-27T22:32:37.726Z","title":"Leostream Connection Broker 8.2.x is affected by stored XSS.","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","published":"2020-10-06T15:15:15.000Z","lastModified":"2026-06-17T03:08:14.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.1","score":9.6,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H"},"cwe":["CWE-79"],"affected":["leostream/connection broker"],"epss":{"score":0.02119,"percentile":0.81739,"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 (2.12%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://adepts.of0x.cc/leostream-xss-to-rce/","tags":["Exploit","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://www.leostream.com/resources/product-lifecycle/","tags":["Release Notes","Vendor Advisory"],"source":"cve@mitre.org"},{"url":"https://adepts.of0x.cc/leostream-xss-to-rce/","tags":["Exploit","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.leostream.com/resources/product-lifecycle/","tags":["Release Notes","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2020-26574","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."}