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Vulnerability record · CVE-2018-16471 · published 13 November 2018

CVE-2018-16471: Rack project rack cross-site scripting vulnerability

Rack Project · Rack

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.

6.1 CVSS 3.0 Medium EPSS 1.9% · top 21.3% CWE-79 · Cross-site scripting
6.1CVSS 3.0 base score, v2 4.3
1.9%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
10References
17 Jun 2026Last modified by NVD

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.

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00032.html
http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00016.html
https://groups.google.com/forum/#%21topic/rubyonrails-security/GKsAFT924Ag
https://lists.debian.org/debian-lts-announce/2018/11/msg00022.html Mailing ListThird Party Advisory
https://usn.ubuntu.com/4089-1/
http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00032.html
http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00016.html
https://groups.google.com/forum/#%21topic/rubyonrails-security/GKsAFT924Ag
https://lists.debian.org/debian-lts-announce/2018/11/msg00022.html Mailing ListThird Party Advisory
https://usn.ubuntu.com/4089-1/

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Source: NIST National Vulnerability Database (record CVE-2018-16471), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.