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TI-2021-11767 Aliases CVE-2021-31739GHSA-5q2f-65mc-6jvf

The SEPPmail solution is vulnerable to a Cross-Site Scripting vulnerability (XSS)…

Priority MEDIUM 60CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · Low · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-79.

Summary

The SEPPmail solution is vulnerable to a Cross-Site Scripting vulnerability (XSS), because user input is not correctly encoded in HTML attributes when returned by the server.SEPPmail 11.1.10 allows XSS via a recipient address.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00459 40th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

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

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:seppmail:seppmail:11.1.10:*:*:*:*:*:*:*11.1.10VulnerableSEPPmail
  • cpe:2.3:a:seppmail:seppmail:11.1.10:*:*:*:*:*:*:* Versions 11.1.10 Vulnerable ·SEPPmail

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-31739
  2. 2026-10-03 Alias added: GHSA-5q2f-65mc-6jvf

References

Exploit 1

  • TI-2026-02349 SEPPmail User Web Interface Arbitrary File Write to RCE CVSS 4.0CRITICAL 10.0
  • TI-2021-11768 SEPPMail's web frontend, user input is not embedded correctly in the web page and… CVSS 3.1MEDIUM 6.1
  • TI-2026-21852 PDF Password CMDi CVSS 4.0CRITICAL 9.5
  • TI-2026-21853 zip_attachments Path Traversal CVSS 4.0CRITICAL 9.3
  • TI-2026-21854 S/MIME Decryption Tag Sanitization Bypass CVSS 4.0HIGH 8.2
  • TI-2026-21855 Header Email Address Parsing CVSS 4.0HIGH 7.8
See all 11 →

Sources

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