CVE-2018-5478

Contao Cross-site Scripting vulnerabililty

6.1 MediumFix available

Contao 3.x before 3.5.32 allows XSS via the unsubscribe module in the frontend newsletter extension.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: Required

What an attacker can affect

Confidentiality: Low
Integrity: Low
Availability: None

Exploit likelihood

0.41%Up 0.4 points since Sep 22, 2023

What each source reports

NVD Score used 6.1

Contao 3.x before 3.5.32 allows XSS via the unsubscribe module in the frontend newsletter extension.

Record: CVE-2018-5478
CVSS 3.1: 6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

CVE List No score

Contao 3.x before 3.5.32 allows XSS via the unsubscribe module in the frontend newsletter extension.

Record: CVE-2018-5478
Updated: 2026-11-02

EUVDEUVD-2023-2550 No score

Contao 3.x before 3.5.32 allows XSS via the unsubscribe module in the frontend newsletter extension.

Record: EUVD-2023-2550
Updated: 2026-11-03

GitHub AdvisoriesGHSA-mpg7-2rx9-h5qp 6.1

Contao Cross-site Scripting vulnerabililty

Contao 3.x before 3.5.32 allows Cross-site Scripting (XSS) via the unsubscribe module in the frontend newsletter extension.

Record: GHSA-mpg7-2rx9-h5qp
CVSS 3.1: 6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

OSVGHSA-mpg7-2rx9-h5qp 6.1

Contao Cross-site Scripting vulnerabililty

Contao 3.x before 3.5.32 allows Cross-site Scripting (XSS) via the unsubscribe module in the frontend newsletter extension.

Record: GHSA-mpg7-2rx9-h5qp
CVSS 3.1: 6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

Affected products

contao

Affected packages

Affected packages
Package	Affected	Fixed
`contao/core` Packagist	3.0.0 up to 3.5.32	3.5.32
`contao/core` Packagist	3.0.0 up to 3.5.32, plus listed versions 3.0.13.0.23.0.33.0.43.0.5 Show 45 moreShow less 3.0.63.1.03.1.13.1.23.1.33.1.43.1.53.1.RC13.1.beta13.2.03.2.13.2.103.2.113.2.123.2.133.2.143.2.153.2.163.2.173.2.183.2.193.2.23.2.203.2.213.2.33.2.43.2.53.2.63.2.73.2.83.2.93.2.RC13.2.beta13.2.beta23.3.03.3.0-RC13.3.0-RC23.3.0-beta13.3.13.3.23.3.33.3.43.3.53.3.63.3.7	3.5.32

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2018-5478 is a medium vulnerability (CVSS 6.1) in Contao, published September 21, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.41%, the 36th percentile. Fixed in contao/core 3.5.32.

References

This page doesn't list everything

Left out here: 42 versions. The JSON record has them.