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 which got injected to a mail with inline PGP signature gets executed when verifying the signature. 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.).
Why it matters now
EPSS 0.02441 84th 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
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:open-xchange:ox_guard:*:rev4:*:*:*:*:*:* | up to 2.4.2 | Vulnerable | Open-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
- 2026-10-02 Threatist record created from CVE-2016-6854
- 2026-10-03 Alias added: GHSA-8f3m-v9r8-jc7p
References
More Open-Xchange GmbH Ox Guard vulnerabilities
- 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-2016-05889 An issue was discovered in Open-Xchange OX Guard before 2.4.2-rev5. CVSS 3.0MEDIUM 6.1
- TI-2016-05887 An issue was discovered in Open-Xchange OX Guard before 2.4.2-rev5. CVSS 3.0MEDIUM 6.1
Sources
- CVE-2016-6854 · CVE Program
- CVE-2016-6854 · NVD
- FIRST EPSS
- GHSA-8f3m-v9r8-jc7p · GitHub Advisory Database · CC BY 4.0
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