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CVE-2018-12028

24
FAUCET Score

CVE-2018-12028 is an Incorrect Access Control vulnerability affecting Phusion Passenger versions 5.3.x before 5.3.2. A malicious application managed by Passenger could report an arbitrary process ID (PID) to the process manager, leading to the termination of that reported PID if the application subsequently errors. This vulnerability has a CVSS v3 score of 7.8 (High), indicating a local attack vector with low complexity, and high impacts on confidentiality, integrity, and availability. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 5.3.0, < 5.3.2CPE matchmatch criteria
cpe:2.3:a:phusion:passenger:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.8HIGH

CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.8
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.90%
Probability of exploitation in next 30 days
EPSS Percentile
56.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0090 is in the 53rd percentile among its peer group of 11,616 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

rubygemspatch availablevia ghsa
Product: passengerFixed in: 5.3.2

Vendor Advisories (2)

rubygemsGHSA-jjhj-8gx7-x836high

Incorrect Access Control in Phusion Passenger

May 13, 2022
redhatCVE-2018-12028Moderate

passenger: Improper access control in SpawningKit can allow malicious child processes to kill arbitrary processes

Jun 5, 2018

References

blog.phusion.nl / passenger-5-3-2
MitigationVendor Advisory
security.gentoo.org / glsa/201807-02
Third Party Advisory