Reference page — cumulative record through Saturday, October 3, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
AV AC AT PR UI VC VI VA CVSS EPSS %ile KEV N L P N N H H H 9.2 .0058 45.8 —
AFFECTED Product Versions Fixed GestSup unspecified —
TIMELINE Sep 25 Reserved by VulnCheck Sep 25 Published (CNA: VulnCheck) Sep 29 EXPLOIT PUBLISHED — CVE-2026-100389 (GestSup). Public exploit reference added.
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.
| Date | Event | Detail |
|---|---|---|
| September 25, 2026 | Reserved | Reserved by VulnCheck |
| September 25, 2026 | Published | Published (CNA: VulnCheck) |
| September 29, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-100389 (GestSup). Public exploit reference added. |
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|---|---|---|---|
| GestSup | GestSup | — | — | — |
Authoritative record: CVE-2026-100389 at cve.org
Vendors: gestsup
Weaknesses: CWE-434
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-100389 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Saturday, October 3, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.
