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CVE-2018-16471

There is a possible XSS vulnerability in Rack before 2.0.6 and 1.6.11. Carefully crafted requests can impact the data returned by the…

Medium6.1EPSS 1.9%
Published
Updated
Reserved
Assigned by
hackerone

Description

There is a possible XSS vulnerability in Rack before 2.0.6 and 1.6.11. Carefully crafted requests can impact the data returned by the `scheme` method on `Rack::Request`. Applications that expect the scheme to be limited to 'http' or 'https' and do not escape the return value could be vulnerable to an XSS attack. Note that applications using the normal escaping mechanisms provided by Rails may not impacted, but applications that bypass the escaping mechanisms, or do not use them may be vulnerable.

Scores

CVSS scores of CVE-2018-16471, by who scored it
Scored byCVSSScoreVector
NVDNVD · Modified3.0Medium6.1CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS (exploitation in 30 days)
1.9% · top 20% of all CVEs (6 Nov 2026)
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.1.

Weakness

Affected products

Affected packages

From reviewed advisories of the GitHub Advisory Database.

References (5)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .