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CVE-2016-5303

23
FAUCET Score

CVE-2016-5303 is a cross-site scripting (XSS) vulnerability affecting Horde Groupware and Horde Groupware Webmail Edition versions prior to 5.2.16. This flaw allows remote attackers to inject malicious web script or HTML by crafting data:text/html content within form action or xlink attributes. With a CVSS score of 6.1 (Medium), exploitation requires user interaction and could lead to limited confidentiality and integrity impacts. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
5.2.15CPE matchmatch criteria
cpe:2.3:a:horde:groupware:5.2.15:*:*:*:*:*:*:*
5.2.15CPE matchmatch criteria
cpe:2.3:a:horde:groupware:5.2.15:*:*:*:webmail:*:*:*

CVSS Data

CVSS version used by this source: 3.0

6.1MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
2.7
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.51%
Probability of exploitation in next 30 days
EPSS Percentile
71.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0151 is in the 84th percentile among its peer group of 26,221 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

marc.info
Release NotesThird Party Advisory
marc.info
Release NotesThird Party Advisory
github.com / horde/horde/commit/30d5506c20d26efbb9942fbdc6f981a0bd333b97
PatchVendor Advisory
github.com / horde/horde/commit/4d8176d1e9ef5cbd2b3fcacd9b9a4c8e482fb424
PatchVendor Advisory
securityfocus.com / bid/94997