CVE-2026-100389 GestSup - Remote Code Execution

GestSup < 3.2.61 contains a remote code execution caused by improper handling of blocked file extensions in the basic IMAP connector's attachment processing, letting unauthenticated attackers execute PHP attachments via monitored mailboxes.

CVSS base score 8.1 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.58% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Remote Code Execution
Impact
Remote Code Execution
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
25 September 2026
Updated
15 October 2026
Weakness
CWE-434

Vendor fix

Upgrade to version 3.2.61 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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