{"id":"CVE-2026-100389","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-100389","generatedAt":"2026-10-27T23:59:22.758Z","title":"GestSup versions before 3.2.62 contain a remote code execution vulnerability in the basic IMAP connector's attachment handling that fails to skip blocked file extensions.","description":"GestSup versions before 3.2.62 contain a remote code execution vulnerability in the basic IMAP connector's attachment handling that fails to skip blocked file extensions. Unauthenticated attackers can send emails with PHP attachments to monitored mailboxes, which are written to the web-accessible upload/ticket directory and executed when accessed.","published":"2026-09-25T21:17:22.000Z","lastModified":"2026-09-30T17:32:07.000Z","status":"Deferred","sourceIdentifier":"disclosure@vulncheck.com","cvss":{"version":"4.0","score":9.2,"severity":"CRITICAL","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-434"],"affected":[],"epss":{"score":0.0058,"percentile":0.4745,"date":"2026-10-26","history":[{"date":"2026-09-26","score":0.00574,"percentile":0.45185}]},"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 (0.58%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"new","label":"New CVE","at":"2026-09-25T21:17:22.000Z","detail":{"score":"9.2","severity":"CRITICAL","publishedAt":"2026-09-25T21:17:22.483Z"},"summary":"New CVE, critical severity (CVSS 9.2)."}],"references":[{"url":"https://blog.spiizn.xyz/articles/remote-code-execution-turning-a-ticket-into-a-new-issue/","source":"disclosure@vulncheck.com"},{"url":"https://gestsup.fr/index.php?page=changelog","source":"disclosure@vulncheck.com"},{"url":"https://gestsup.fr/index.php?page=download","source":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/gestsup-before-3.2.61-remote-code-execution-via-imap-attachment","source":"disclosure@vulncheck.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-100389","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."}