CVE-2019-5418highunder attackCWE-22

CVE-2019-5418: high-severity vulnerability in Rails https://github.com/rails/rails

Published · Updated

100Vexday Risk Score

Patch now. It under exploitation confirmed by CISA and has a working public exploit.

ssvc Actcvss 7.5epss 99%
from disclosure to weapon0 days
Published on NVDMar 27
1st PoCMar 16
CISA KEV+2294d
exploitation probability
99%top 1% of all CVEs
observed exploitation
yesCISA + VulnCheck
19 public exploit(s)
What the vendors declare (VEX)

Official vendor statements in CSAF/VEX format: whether their product is affected, already fixed, or ruled out — and why. These are the vendor's assertions, not Vexday's judgment.

Red HatVEX document ↗
Fixed
9 products (75 components)
CloudForms Management Engine 5.10 · CloudForms Management Engine 5.9 · Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 6) · Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) · Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.4) · and others 4
fix ↗
Action required by CISAfederal deadline: 2025-07-28

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

In short

A vulnerability in Action View allows attackers to read arbitrary files from a server by sending specially crafted accept headers. This can expose sensitive data like configuration files or private keys.

Technical detail

Path traversal vulnerability in Action View's accept header handling (CWE-22) allows unauthenticated attackers to disclose arbitrary file contents through crafted HTTP headers without requiring authentication or special permissions. Affected versions: <5.2.2.1, <5.1.6.2, <5.0.7.2, <4.2.11.1, and v3.

Summary generated and translated by AI from the official description.

The full analysis of this CVE is available in Portuguese →

There is a File Content Disclosure vulnerability in Action View <5.2.2.1, <5.1.6.2, <5.0.7.2, <4.2.11.1 and v3 where specially crafted accept headers can cause contents of arbitrary files on the target system's filesystem to be exposed.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Affected products
Rails · https://github.com/rails/rails
public PoCs found — 19
exploitdbwww.exploit-db.com/exploits/46585unverifiedgithubgithub.com/mpgn/CVE-2019-5418★ 201githubgithub.com/mpgn/Rails-doubletap-RCE★ 132githubgithub.com/brompwnie/CVE-2019-5418-Scanner★ 36githubgithub.com/omarkurt/CVE-2019-5418★ 5githubgithub.com/random-robbie/CVE-2019-5418★ 5githubgithub.com/Bad3r/RailroadBandit★ 3githubgithub.com/kailing0220/CVE-2019-5418★ 2githubgithub.com/melardev/CVE-2019-5418★ 0githubgithub.com/daehyeok0618/CVE-2019-5418★ 0githubgithub.com/ztgrace/CVE-2019-5418-Rails3★ 0vulncheckvulncheck.com/xdb/cefcc3ffbf85unverifiedcve_referencewww.exploit-db.com/exploits/46585/unverifiedvulncheckvulncheck.com/xdb/34f001d1be76unverifiedvulncheckvulncheck.com/xdb/2a15ef59cca5unverifiedvulncheckvulncheck.com/xdb/b79d8b670127unverifiedvulncheckvulncheck.com/xdb/7ec4db8cca50unverifiedvulncheckvulncheck.com/xdb/f2ddbe7de150unverifiedcve_referencepacketstormsecurity.com/files/152178/Rails-5.2.1-Arbitrary-File-Content-Disclosure.htmlunverified
⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
Related CVEs — Rails https://github.com/rails/rails

In the same product, most dangerous first.

CVE-2019-5420—CVE-2019-5420EPSS 89.3%CVE-2019-5419—CVE-2019-5419EPSS 8.8%
References
http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00011.htmlhttp://packetstormsecurity.com/files/152178/Rails-5.2.1-Arbitrary-File-Content-Disclosure.htmlhttps://access.redhat.com/errata/RHSA-2019:0796https://access.redhat.com/errata/RHSA-2019:1147https://access.redhat.com/errata/RHSA-2019:1149https://access.redhat.com/errata/RHSA-2019:1289https://groups.google.com/forum/#%21topic/rubyonrails-security/pFRKI96Sm8Qhttps://lists.debian.org/debian-lts-announce/2019/03/msg00042.htmlhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y43636TH4D6T46IC6N2RQVJTRFJAAYGA/https://web.archive.org/web/20190313201629/https://weblog.rubyonrails.org/2019/3/13/Rails-4-2-5-1-5-1-6-2-have-been-released/https://weblog.rubyonrails.org/2019/3/13/Rails-4-2-5-1-5-1-6-2-have-been-released/https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-5418