What’s Vulnerable › Vulnerabilities

CVE-2019-15587: Loofah Allows Cross-site Scripting

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-10-22 · updated 2026-06-17
• Weakness: CWE-79

Description

In the Loofah gem for Ruby through v2.3.0 unsanitized JavaScript may occur in sanitized output when a crafted SVG element is republished.

Affected products

• Canonical Ubuntu Linux: 16.04
• Debian Linux: 9.0, 10.0
• Fedoraproject Fedora: 30, 31
• flavorjones loofah: through 2.3.0
• Rubygems Loofah: before 2.3.1; 0.2.0, 0.2.1, 0.2.2, 0.3.0, 0.3.1, 0.4.0 (+25) — fixed in 2.3.1

How to fix

Upgrade to a fixed version: Rubygems Loofah 2.3.1. Check the vendor advisory for mitigations.

References

• https://github.com/flavorjones/loofah/issues/171
• https://hackerone.com/reports/709009
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4WK2UG7ORKRQOJ6E4XJ2NVIHYJES6BYZ/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XMCWPLYPNIWYAY443IZZJ4IHBBLIHBP5/
• https://security.netapp.com/advisory/ntap-20191122-0003/
• https://usn.ubuntu.com/4498-1/
• https://www.debian.org/security/2019/dsa-4554
• https://github.com/flavorjones/loofah/issues/171
• https://hackerone.com/reports/709009
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4WK2UG7ORKRQOJ6E4XJ2NVIHYJES6BYZ/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XMCWPLYPNIWYAY443IZZJ4IHBBLIHBP5/
• https://security.netapp.com/advisory/ntap-20191122-0003/

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