CVE-2026-100389

CVSS 9.2 (critical) · published 2026-09-25

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.

Weakness: CWE-434

Source: NVD CVE-2026-100389

References

• https://blog.spiizn.xyz/articles/remote-code-execution-turning-a-ticket-into-a-new-issue/
• https://gestsup.fr/index.php?page=changelog
• https://gestsup.fr/index.php?page=download
• https://www.vulncheck.com/advisories/gestsup-before-3.2.61-remote-code-execution-via-imap-attachment

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