Critical RCE Vulnerabilities in AcyMailing and GestSup Exploited via Email Attachments
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- •CVE-2026-94132 allows RCE via unvalidated MIME attachments in AcyMailing.
- •CVE-2026-100389 enables RCE through unauthenticated email attachments in GestSup.
- •Both vulnerabilities have critical CVSS scores and are actively discussed on social media.
Two critical remote code execution vulnerabilities have been disclosed affecting AcyMailing Enterprise and GestSup. CVE-2026-94132, affecting AcyMailing versions below 11.1.0, allows attackers to exploit unvalidated MIME attachments in POP3 mode, achieving RCE. CVE-2026-100389 in GestSup versions before 3.2.61 similarly allows unauthenticated attackers to send PHP attachments to monitored mailboxes, which are then executed. Both vulnerabilities have received significant attention, with CVSS scores of 9.5 and 9.2 respectively. A proof-of-concept (PoC) for CVE-2026-94132 was released on September 27, 2026, indicating active exploitation potential. Organizations using these systems are urged to update or mitigate the vulnerabilities immediately. The vulnerabilities are particularly concerning due to their ease of exploitation through email.
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