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TI-2026-58323 Aliases CVE-2026-84832GHSA-223j-mh9x-75cm

Unsafe deserialization in the REST interface

Priority MEDIUM 40CWE-502Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-502.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00637 50th percentileScored 2026-11-07
Fix Fixed SEPPmail Secure Email Gateway (SEG) (SEPPmail AG): 15.0.6

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
SEPPmailSEPPmail Secure Email Gateway (SEG)before 15.0.615.0.6Patch availableCNA
  • SEPPmail Secure Email Gateway (SEG) VendorSEPPmail Affected before 15.0.6 Fixed in 15.0.6 Patch available CNA

Remediation

  • Fix · CNA SEPPmail Secure Email Gateway (SEG) (SEPPmail AG) Fixed in 15.0.6

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-84832
  2. 2026-10-03 Alias added: GHSA-223j-mh9x-75cm
  3. 2026-10-25 EPSS moved to the 50th–90th percentile

References

Other 1

  • TI-2026-02349 SEPPmail User Web Interface Arbitrary File Write to RCE CVSS 4.0CRITICAL 10.0
  • TI-2026-32138 Local File Inclusion (LFI) and Arbitrary File Deletion CVSS 4.0HIGH 8.8
  • TI-2021-11768 SEPPMail's web frontend, user input is not embedded correctly in the web page and… CVSS 3.1MEDIUM 6.1
  • TI-2021-11767 The SEPPmail solution is vulnerable to a Cross-Site Scripting vulnerability (XSS)… CVSS 3.1MEDIUM 6.1
  • TI-2026-06922 Exposure of Sensitive Information to an Unauthorized Actor CVSS 4.0MEDIUM 6.9
  • TI-2026-32139 Unauthenticated remote code execution in SEPPmail Secure Email Gateway CVSS 4.0CRITICAL 9.3
See all 41 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences