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Vulnerability record · CVE-2020-8159 · published 12 May 2020

CVE-2020-8159: Rubyonrails actionpack page-caching path traversal vulnerability

Rubyonrails · Actionpack Page Caching

There is a vulnerability in actionpack_page-caching gem < v1.2.1 that allows an attacker to write arbitrary files to a web server, potentially resulting in remote code execution if the attacker can write unescaped ERB to a view.

9.8 CVSS 3.1 Critical EPSS 5.4% · top 7.6% CWE-22 · Path traversal
9.8CVSS 3.1 base score, v2 7.5
5.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

There is a vulnerability in actionpack_page-caching gem < v1.2.1 that allows an attacker to write arbitrary files to a web server, potentially resulting in remote code execution if the attacker can write unescaped ERB to a view.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

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

References

LinkTags
https://groups.google.com/forum/#%21topic/rubyonrails-security/CFRVkEytdP8
https://lists.debian.org/debian-lts-announce/2021/07/msg00019.html Mailing ListThird Party Advisory
https://groups.google.com/forum/#%21topic/rubyonrails-security/CFRVkEytdP8
https://lists.debian.org/debian-lts-announce/2021/07/msg00019.html Mailing ListThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-8159), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.