{"id":"CVE-2026-102139","title":"An authorization check in the large file exchange feature of Kiteworks Email Protection Gateway did not correctly establish that the requesting user was a party to the package being requested","summary":"An authorization check in the large file exchange feature of Kiteworks Email Protection Gateway did not correctly establish that the requesting user was a party to the package being requested. An authenticated user of that optional featu…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","cwe":["CWE-639","CWE-863"],"vendor":"accellion","product":"kiteworks","affected":["kiteworks < 9.5.1"],"patched":["kiteworks 9.5.1"],"published":"2026-09-30","updated":"2026-10-07","sourceUpdated":"2026-10-07T15:01:35.230","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-102139","references":[{"url":"https://github.com/kiteworks/security-advisories/security/advisories/GHSA-fp46-xhg8-vpgm","label":"9119a7d8-5eab-497f-8521-727c672e3725"},{"url":"https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/VA/white/2026/va-26-274-01.json","label":"9119a7d8-5eab-497f-8521-727c672e3725"}],"tags":["nvd","cve.org"],"epss":0.00394,"epssPercentile":0.3347,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-01T13:26:22.762488Z"},"ingestedAt":"2026-09-30T21:25:07.835Z","slug":"CVE-2026-102139","body":"## Overview\n\nAn authorization check in the large file exchange feature of Kiteworks Email Protection Gateway did not correctly establish that the requesting user was a party to the package being requested. An authenticated user of that optional feature could read the subject, message body, and attachments of packages they neither sent nor received.\n\n## Affected\n\n- `kiteworks < 9.5.1`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `kiteworks 9.5.1`","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}