CVE-2016-6854

MEDIUM

Open-Xchange OX Guard < 2.4.2 - Stored Cross-Site Scripting via PGP Signature Verification

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2016-6854. PoCs published by Benjamin Daniel Mussler.

AI-analyzed exploit summary This is a vulnerability writeup detailing three XSS vulnerabilities in OX Guard. It describes the vulnerabilities, steps to reproduce, and solutions but does not contain exploit code.

Description

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.).

Exploits (1)

exploitdb WRITEUP
by Benjamin Daniel Mussler · textwebappslinux
https://www.exploit-db.com/exploits/40377

This is a vulnerability writeup detailing three XSS vulnerabilities in OX Guard. It describes the vulnerabilities, steps to reproduce, and solutions but does not contain exploit code.

Classification
Writeup 100%
Attack Type
Xss
Complexity
Trivial
Reliability
Reliable
Target: OX Guard 2.4.2 and earlier
No auth needed
Prerequisites: Victim interaction required (e.g., opening a malicious email or clicking a link)
MITRE ATT&CK
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (4)

Core 4
Core References
Third Party Advisory, VDB Entry vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/92920
Exploit, Third Party Advisory, VDB Entry x_refsource_confirm
http://packetstormsecurity.com/files/138701/Open-Xchange-Guard-2.4.2-Cross-Site-Scripting.html
Exploit, Third Party Advisory, VDB Entry exploit x_refsource_exploit-db
https://www.exploit-db.com/exploits/40377/
Third Party Advisory, VDB Entry mailing-list x_refsource_bugtraq
http://www.securityfocus.com/archive/1/539395/100/0/threaded

Scores

CVSS v3 6.1
EPSS 0.0244
EPSS Percentile 82.2%
Attack Vector NETWORK
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Details

CWE
CWE-79
Status published
Products (1)
open-xchange/ox_guard < 2.4.2
Published Dec 15, 2016
Tracked Since Feb 18, 2026