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Vulnerability details: VCID-a91w-ppku-ebfc
Vulnerability ID VCID-a91w-ppku-ebfc
Aliases CVE-2018-12027
GHSA-whfx-877c-5p28
Summary Information Exposure Given a Passenger-spawned application process that reports that it listens on a certain Unix domain socket, if any of the parent directories of said socket are writable by a normal user that is not the application's user, then that non-application user can swap that directory with something else, resulting in traffic being redirected to a non-application user's process through an alternative Unix domain socket.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (5)
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
CWE-732 Incorrect Permission Assignment for Critical Resource
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-284 Improper Access Control
System Score Found at
cvssv3 6.3 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-12027.json
epss 0.00275 https://api.first.org/data/v1/epss?cve=CVE-2018-12027
epss 0.00275 https://api.first.org/data/v1/epss?cve=CVE-2018-12027
epss 0.00275 https://api.first.org/data/v1/epss?cve=CVE-2018-12027
epss 0.00275 https://api.first.org/data/v1/epss?cve=CVE-2018-12027
epss 0.00275 https://api.first.org/data/v1/epss?cve=CVE-2018-12027
epss 0.00275 https://api.first.org/data/v1/epss?cve=CVE-2018-12027
epss 0.00275 https://api.first.org/data/v1/epss?cve=CVE-2018-12027
epss 0.00275 https://api.first.org/data/v1/epss?cve=CVE-2018-12027
epss 0.00275 https://api.first.org/data/v1/epss?cve=CVE-2018-12027
epss 0.00275 https://api.first.org/data/v1/epss?cve=CVE-2018-12027
epss 0.00275 https://api.first.org/data/v1/epss?cve=CVE-2018-12027
epss 0.00275 https://api.first.org/data/v1/epss?cve=CVE-2018-12027
epss 0.00275 https://api.first.org/data/v1/epss?cve=CVE-2018-12027
epss 0.00275 https://api.first.org/data/v1/epss?cve=CVE-2018-12027
cvssv3 8.8 https://blog.phusion.nl/passenger-5-3-2
cvssv3.1 8.8 https://blog.phusion.nl/passenger-5-3-2
generic_textual HIGH https://blog.phusion.nl/passenger-5-3-2
cvssv3.1_qr HIGH https://github.com/advisories/GHSA-whfx-877c-5p28
cvssv3.1 8.8 https://github.com/phusion/passenger
generic_textual HIGH https://github.com/phusion/passenger
cvssv3.1 8.8 https://github.com/rubysec/ruby-advisory-db/blob/master/gems/passenger/CVE-2018-12027.yml
generic_textual HIGH https://github.com/rubysec/ruby-advisory-db/blob/master/gems/passenger/CVE-2018-12027.yml
cvssv2 6.5 https://nvd.nist.gov/vuln/detail/CVE-2018-12027
cvssv3 8.8 https://nvd.nist.gov/vuln/detail/CVE-2018-12027
cvssv3.1 8.8 https://nvd.nist.gov/vuln/detail/CVE-2018-12027
generic_textual HIGH https://nvd.nist.gov/vuln/detail/CVE-2018-12027
cvssv3.1 8.8 https://security.gentoo.org/glsa/201807-02
generic_textual HIGH https://security.gentoo.org/glsa/201807-02
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-12027.json
https://api.first.org/data/v1/epss?cve=CVE-2018-12027
https://blog.phusion.nl/passenger-5-3-2
https://github.com/phusion/passenger
https://github.com/rubysec/ruby-advisory-db/blob/master/gems/passenger/CVE-2018-12027.yml
1592619 https://bugzilla.redhat.com/show_bug.cgi?id=1592619
cpe:2.3:a:phusion:passenger:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:phusion:passenger:*:*:*:*:*:*:*:*
CVE-2018-12027 https://nvd.nist.gov/vuln/detail/CVE-2018-12027
GHSA-whfx-877c-5p28 https://github.com/advisories/GHSA-whfx-877c-5p28
GLSA-201807-02 https://security.gentoo.org/glsa/201807-02
No exploits are available.
Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-12027.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Found at https://blog.phusion.nl/passenger-5-3-2
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Found at https://github.com/phusion/passenger
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Found at https://github.com/rubysec/ruby-advisory-db/blob/master/gems/passenger/CVE-2018-12027.yml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:N/AC:L/Au:S/C:P/I:P/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2018-12027
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2018-12027
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2018-12027
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Found at https://security.gentoo.org/glsa/201807-02
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.50846
EPSS Score 0.00275
Published At April 1, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T12:47:48.043373+00:00 GitLab Importer Import https://gitlab.com/gitlab-org/advisories-community/-/blob/main/gem/passenger/CVE-2018-12027.yml 38.0.0