CVE-2026-100389

GestSup before 3.2.62 Remote Code Execution via IMAP Attachment

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.

Affected

GestSup

CVSS v4.0 VULNCHECK

9.2 CRITICALCVSS: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/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1 VULNCHECK

8.1 HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

0.58% chance of exploitation in the next 30 days, 47th percentile

Published

2026-09-25

Updated

2026-09-30

Proof-of-concept exploits (2)

• https://blog.spiizn.xyz/articles/remote-code-execution-turning-a-ticket-into-a-new-issue/
• SpiizN/cves1★ · 2026-10-08

References

• CVE Record
• NVD entry

Related

• CVE-2026-102372
• CVE-2026-102373
• CVE-2026-102374