CVE-2016-5303

Cross-site scripting (XSS) vulnerability in the Horde Text Filter API in Horde Groupware and...

6.1 MediumFix available

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: Required

What an attacker can affect

Confidentiality: Low
Integrity: Low
Availability: None

Exploit likelihood

1.51%Up 0.3 points since Feb 4, 2022

What each source reports

NVD Score used 6.1

Record: CVE-2016-5303
CVSS 3.0: 6.1 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CVSS 2.0: 4.3 MediumAV:N/AC:M/Au:N/C:N/I:P/A:N
Weakness: CWE-79
Updated: 2026-11-02

CVE List No score

Record: CVE-2016-5303
Updated: 2026-11-02

EUVDEUVD-2016-6254 No score

Record: EUVD-2016-6254
Updated: 2026-11-03

GitHub AdvisoriesGHSA-6mv9-x42q-f8qh 6.1

Cross-site scripting (XSS) vulnerability in the Horde Text Filter API in Horde Groupware and...

Record: GHSA-6mv9-x42q-f8qh
CVSS 3.0: 6.1 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

OSV 6.1

Record: CVE-2016-5303
CVSS 3.0: 6.1 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Updated: 2026-11-02

OSVDEBIAN-CVE-2016-5303 6.1

Record: DEBIAN-CVE-2016-5303
CVSS 3.0: 6.1 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Updated: 2026-11-02

OSVUBUNTU-CVE-2016-5303 6.1

Record: UBUNTU-CVE-2016-5303
CVSS 3.0: 6.1 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Updated: 2026-11-02

Affected products

horde groupware

Affected packages

Affected packages
Package	Affected	Fixed
`php-horde-text-filter` Debian:12	before 2.3.5-1	2.3.5-1
`php-horde-text-filter` Ubuntu:16.04:LTS	All versions, plus listed versions 2.3.2-12.3.2-22.3.3-12.3.3-1ubuntu1	None known

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2016-5303 is a medium vulnerability (CVSS 6.1) in Horde Groupware, published December 20, 2016. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.51%, the 74th percentile. Fixed in php-horde-text-filter 2.3.5-1.

References

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