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Vulnerability details: VCID-6bch-mqbz-bqfs
Vulnerability ID VCID-6bch-mqbz-bqfs
Aliases CVE-2018-5478
GHSA-mpg7-2rx9-h5qp
Summary XSS vulnerability in the newsletter extension The vulnerability is in the "unsubscribe" module of the newsletter extension and can easily be exploited by anyone in the front end. If you are not using the newsletter extension or the "unsubscribe" module, your installation is not affected by the vulnerability.
Status Published
Exploitability 0.5
Weighted Severity 6.2
Risk 3.1
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
System Score Found at
epss 0.00076 https://api.first.org/data/v1/epss?cve=CVE-2018-5478
cvssv3.1 6.1 https://contao.org/en/news/contao-3_5_32.html
generic_textual MODERATE https://contao.org/en/news/contao-3_5_32.html
cvssv3.1 6.1 https://github.com/contao/core
generic_textual MODERATE https://github.com/contao/core
cvssv3.1 6.1 https://github.com/contao/core/commit/3123d6527ae6c46087b0ad8061eb8651cb645b8d
generic_textual MODERATE https://github.com/contao/core/commit/3123d6527ae6c46087b0ad8061eb8651cb645b8d
cvssv3.1 6.1 https://github.com/FriendsOfPHP/security-advisories/blob/master/contao/core/CVE-2018-5478.yaml
generic_textual MODERATE https://github.com/FriendsOfPHP/security-advisories/blob/master/contao/core/CVE-2018-5478.yaml
cvssv3.1 6.1 https://nvd.nist.gov/vuln/detail/CVE-2018-5478
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2018-5478
cvssv3.1 6.1 https://security.snyk.io/vuln/SNYK-PHP-CONTAOCORE-70397
generic_textual MODERATE https://security.snyk.io/vuln/SNYK-PHP-CONTAOCORE-70397
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2018-5478
https://contao.org/en/news/contao-3_5_32.html
https://github.com/contao/core
https://github.com/contao/core/commit/3123d6527ae6c46087b0ad8061eb8651cb645b8d
https://github.com/FriendsOfPHP/security-advisories/blob/master/contao/core/CVE-2018-5478.yaml
https://nvd.nist.gov/vuln/detail/CVE-2018-5478
https://security.snyk.io/vuln/SNYK-PHP-CONTAOCORE-70397
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://contao.org/en/news/contao-3_5_32.html
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:N/UI:R/S:C/C:L/I:L/A:N Found at https://github.com/contao/core
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:N/UI:R/S:C/C:L/I:L/A:N Found at https://github.com/contao/core/commit/3123d6527ae6c46087b0ad8061eb8651cb645b8d
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:N/UI:R/S:C/C:L/I:L/A:N Found at https://github.com/FriendsOfPHP/security-advisories/blob/master/contao/core/CVE-2018-5478.yaml
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:N/UI:R/S:C/C:L/I:L/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2018-5478
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:N/UI:R/S:C/C:L/I:L/A:N Found at https://security.snyk.io/vuln/SNYK-PHP-CONTAOCORE-70397
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 0.2291
EPSS Score 0.00076
Published At June 4, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-02T04:37:26.552128+00:00 GitLab Importer Import https://gitlab.com/gitlab-org/advisories-community/-/blob/main/packagist/contao/newsletter-bundle/CVE-2018-5478.yml 38.6.0