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CVE-2020-28903

24
FAUCET Score

CVE-2020-28903 describes an improper input validation vulnerability (CWE-79) in Nagios Fusion versions 4.1.8 and earlier. This flaw allows a remote attacker, who has control over a fused server, to inject arbitrary HTML, leading to a Cross-Site Scripting (XSS) attack. The vulnerability carries a CVSS v3.1 score of 6.1 (Medium), indicating it can be exploited with low attack complexity and no privileges required, potentially impacting confidentiality and integrity. Currently, there is no evidence of active exploitation, nor are there publicly available exploit modules or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 4.1.8CPE matchmatch criteria
cpe:2.3:a:nagios:fusion:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.1MEDIUM

CVSS:3.1/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
3.1

Exploit Intelligence

EPSS Score
10.10%
Probability of exploitation in next 30 days
EPSS Percentile
95.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.1010 is in the 98th percentile among its peer group of 26,236 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

Remediation records are not available for this CVE.

References

packetstormsecurity.com / files/162783/Nagios-XI-Fusion-Privilege-Escalation-Cross-Site-Scripting-Code-Execution.html
Third Party AdvisoryVDB Entry
skylightcyber.com / 2021/05/20/13-nagios-vulnerabilities-7-will-shock-you
ExploitThird Party Advisory
nagios.com / downloads/nagios-xi/change-log
Release NotesVendor Advisory