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CVE-2018-16471

23
FAUCET Score

CVE-2018-16471 describes a possible Cross-Site Scripting (XSS) vulnerability in Rack versions prior to 2.0.6 and 1.6.11, affecting applications that do not properly escape the return value of the Rack::Request scheme method. This medium-severity vulnerability (CVSS 6.1) can be triggered by carefully crafted requests, potentially leading to information disclosure or limited integrity impact if applications bypass or do not use standard escaping mechanisms. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion, with only one minor media mention.

Impacted Technologies

VendorProductVersion(s)CPE
>= 1.6.0, < 1.6.11CPE matchmatch criteria
cpe:2.3:a:rack_project:rack:*:*:*:*:*:*:*:*
>= 2.0.0, < 2.0.6CPE matchmatch criteria
cpe:2.3:a:rack_project:rack:*:*:*:*:*:*:*:*
8.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*

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
1.88%
Probability of exploitation in next 30 days
EPSS Percentile
77.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0188 is in the 89th percentile among its peer group of 26,234 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

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 (7)

rubygemspatch availablevia ghsa
Product: rackFixed in: 2.0.6
rubygemspatch availablevia ghsa
Product: rackFixed in: 1.6.11
redhatend of lifevia redhat_api
Product: Red Hat Software CollectionsFixed in: rh-ror42-rubygem-rack
redhatend of lifevia redhat_api
Product: Red Hat Software CollectionsFixed in: rh-ror50-rubygem-rack
redhatend of lifevia redhat_api
Product: Red Hat Storage 3Fixed in: rubygem-rack
redhatend of lifevia redhat_api
Product: Red Hat Subscription Asset ManagerFixed in: ruby193-rubygem-rack
redhatend of lifevia redhat_api
Product: Red Hat Update Infrastructure 3 for Cloud ProvidersFixed in: rubygem-rack

Vendor Advisories (2)

rubygemsGHSA-5r2p-j47h-mhpgmedium

Rack vulnerable to Cross-site Scripting

Nov 15, 2018
redhatCVE-2018-16471Moderate

rubygem-rack: Cross-site scripting (XSS) via `scheme` method on `Rack::Request`

Nov 6, 2018

References

lists.opensuse.org / opensuse-security-announce/2019-06/msg00032.html
lists.opensuse.org / opensuse-security-announce/2020-02/msg00016.html
groups.google.com / forum
lists.debian.org / debian-lts-announce/2018/11/msg00022.html
Mailing ListThird Party Advisory
usn.ubuntu.com / 4089-1