Vulnerability Report

CVE-2016-5303

Title: Horde Groupware Cross-Site Scripting (XSS)

XSS

Proof Of Concept

No public PoC currently indexed for CVE-2016-5303.

CWE Category CWE-79

Published Date Dec 20, 2016

Modified Date May 06, 2026

Exploit Status Not Found

Score 6.1 CVSS v3.0

Exploit Probability (EPSS)

1.51%

Vulnerability Summary

CVE-2016-5303: Cross-site scripting (XSS) vulnerability in the Horde Text Filter API in Horde Groupware and Horde Groupware Webmail Edition before 5.2.16 allows remote attackers to inject arbitrary web script or HTML via crafted data:text/html content in a form (1) action or (2) xlink attribute.

Impacted Vendors

horde 1

nulllogic 1

handysoft 1

Reference Links

http://marc.info/?l=horde-announce&m=147319066126665&w=2 http://marc.info/?l=horde-announce&m=147319089526753&w=2 http://www.securityfocus.com/bid/94997 https://github.com/horde/horde/commit/30d5506c20d26efbb9942fbdc6f981a0bd333b97 https://github.com/horde/horde/commit/4d8176d1e9ef5cbd2b3fcacd9b9a4c8e482fb424 http://marc.info/?l=horde-announce&m=147319066126665&w=2 http://marc.info/?l=horde-announce&m=147319089526753&w=2 http://www.securityfocus.com/bid/94997 https://github.com/horde/horde/commit/30d5506c20d26efbb9942fbdc6f981a0bd333b97 https://github.com/horde/horde/commit/4d8176d1e9ef5cbd2b3fcacd9b9a4c8e482fb424

CVSS v3.0

Source Entity [email protected]

Severity MEDIUM

6.1

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

REQUIRED

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

CHANGED

RAW VECTOR CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS v2.0

Source Entity [email protected]

Severity MEDIUM

4.3

Access Vector

N/A

Authentication

N/A

RAW VECTOR AV:N/AC:M/Au:N/C:N/I:P/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2016-5303 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

May 06, 2026 MODIFIED

Vulnerability data updated via NVD.

April 12, 2025 MODIFIED

Vulnerability data or affected products updated.

December 20, 2016 PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector NETWORK

Complexity LOW

Privileges N/A

Interaction REQUIRED

CVSS Vector String


                                    CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected Stack

No specific products linked.