CVE-2026-84832: high-severity vulnerability in SEPPmail Secure Email Gateway (SEG)
Unsafe deserialization in the REST interface
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.6epss 0.6%
SEPPmail Secure Email Gateway before 15.0.6 deserializes attacker-controlled data in a privileged REST import workflow without adequate validation. An attacker with a privileged API token can execute arbitrary commands with "nobody" privileges.
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Affected products
SEPPmail AG · SEPPmail Secure Email Gateway (SEG)public PoCs found — 1
cve_referencegithub.com/WWBN/AVideo/security/advisories/GHSA-pp65-5j34-grgcunverified⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
Related CVEs — SEPPmail Secure Email Gateway (SEG)
In the same product, most dangerous first.
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