CVE-2020-5267: Possible XSS vulnerability in ActionView

Severity: medium (CVSS 4.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.5% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2020-03-19 · updated 2026-06-17
Weakness: CWE-80

Description

In ActionView before versions 6.0.2.2 and 5.2.4.2, there is a possible XSS vulnerability in ActionView's JavaScript literal escape helpers. Views that use the `j` or `escape_javascript` methods may be susceptible to XSS attacks. The issue is fixed in versions 6.0.2.2 and 5.2.4.2.

Affected products

Debian Linux: 8.0
Fedoraproject Fedora: 33
openSUSE Leap: 15.1
rails actionview: before 5.2.4.2; from 6.0.0 before 6.0.2.2 — fixed in 5.2.4.2, 6.0.2.2
Rubygems Actionview: before 5.2.4.2; from 6.0.0 before 6.0.2.2; 4.1.0, 4.1.0.beta1, 4.1.0.beta2, 4.1.0.rc1, 4.1.0.rc2, 4.1.1 (+142) — fixed in 5.2.4.2, 6.0.2.2

How to fix

Upgrade to a fixed version: rails actionview 5.2.4.2, 6.0.2.2; Rubygems Actionview 5.2.4.2, 6.0.2.2. Check the vendor advisory for mitigations.

References

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