EUVD-2026-70364
GHSA-223j-mh9x-75cm
Severity by source
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/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
Network-reachable REST API with low complexity but PR:H required; 'nobody' execution stays within the vulnerable system scope (S:U) with full C/I/A impact on the appliance.
Primary rating from Vendor (NCSC.ch).
CVSS VectorVendor: NCSC.ch
Lifecycle Timeline
4DescriptionCVE.org
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.
AnalysisAI
Arbitrary OS command execution in SEPPmail Secure Email Gateway before 15.0.6 is possible via CWE-502 deserialization in the privileged REST API import workflow. An attacker who holds a privileged API token can submit a crafted serialized payload to the import endpoint and trigger command execution under the 'nobody' system account. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires possession of a valid privileged API token for the SEPPmail SEG REST API - this is a hard prerequisite enforced by the PR:H CVSS metric. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:H/UI:N) reflects a network-reachable, low-complexity attack gated on possession of a privileged API token, yielding full confidentiality, integrity, and availability impact against the vulnerable system with no subsequent-system impact declared. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade SEPPmail Secure Email Gateway to version 15.0.6 or later, per the vendor release notes at https://downloads.seppmail.com/extrelnotes/150/ERN15.0.html. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, immediately rotate all privileged API tokens and audit access logs for anomalous import workflow activity; implement immediate network-level restrictions on API endpoints. …
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Same weakness CWE-502 – Deserialization of Untrusted Data
View allSame technique Deserialization
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External POC / Exploit Code
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