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TI-2016-05887 Aliases CVE-2016-6851GHSA-494v-jqp4-m59h

An issue was discovered in Open-Xchange OX Guard before 2.4.2-rev5.

Priority LOW 32CWE-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 3.0 · NVD. Fix status from CNA. Impact type from CWE-79.

Summary

An issue was discovered in Open-Xchange OX Guard before 2.4.2-rev5. Script code can be provided as parameter to the OX Guard guest reader web application. This allows cross-site scripting attacks against arbitrary users since no prior authentication is needed. Malicious script code can be executed within a user's context. This can lead to session hijacking or triggering unwanted actions via the web interface (sending mail, deleting data etc.) in case the user has an active session on the same domain already.

Why it matters now

EPSS 0.02643 85th percentileScored 2026-11-07
Public exploit Yes 2 exploit referencesTagged by NVD and the CNA
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

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:open-xchange:ox_guard:*:rev4:*:*:*:*:*:*up to 2.4.2VulnerableOpen-Xchange GmbH
  • cpe:2.3:a:open-xchange:ox_guard:*:rev4:*:*:*:*:*:* Versions up to 2.4.2 Vulnerable ·Open-Xchange GmbH

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2016-6851
  2. 2026-10-03 Alias added: GHSA-494v-jqp4-m59h

References

Exploit 2

  • TI-2015-07026 An issue was discovered in Open-Xchange Guard before 2.2.0-rev8. CVSS 3.0HIGH 8.8
  • TI-2018-07786 OX Guard 2.8.0 has CSRF. CVSS 3.0HIGH 8.8
  • TI-2020-17472 OX Guard 2.10.4 and earlier allows a Denial of Service via a WKS server that responds… CVSS 3.1HIGH 7.5
  • TI-2016-03424 An issue was discovered in Open-Xchange OX Guard before 2.4.0-rev8. CVSS 3.0HIGH 7.5
  • TI-2016-05890 An issue was discovered in Open-Xchange OX Guard before 2.4.2-rev5. CVSS 3.0MEDIUM 6.1
  • TI-2016-05889 An issue was discovered in Open-Xchange OX Guard before 2.4.2-rev5. CVSS 3.0MEDIUM 6.1
See all 10 →

Sources

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