Information disclosure in the Contao backend

published 2019-12-17 6 y ago modified 2026-06-17 4 mo ago also GHSA-4mvc-qc5w-v5qr , EUVD-2019-0776

cvss: 5.3; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.9%; EPSS 0.9% chance of exploitation in 30 days, percentile 59%
public exploits: 0; none known

Contao 4.0 through 4.8.5 has Insecure Permissions. Back end users can manipulate the details view URL to show pages and articles that have not been enabled for them.

Patch / fix

fixed in 2

packagist contao/core-bundle 4.4.46, 4.8.6
packagist contao/contao 4.4.46, 4.8.6

Exploit prediction

0.88% chance of exploitation in the next 30 days, higher than 59% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:P/I:N/A:N
GitHub	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected packages

ecosystem	package	affected	fixed in
packagist	contao/core-bundle	>=4.0.0, <4.4.46 >=4.5.0, <4.8.6	4.4.46 4.8.6
packagist	contao/contao	>=4.0.0, <4.4.46 >=4.5.0, <4.8.6	4.4.46 4.8.6

Classification

Weakness

CWE-276 Incorrect Default Permissions

References

contao.org /en/news.html
web, release-notes, vendor-advisory
contao.org /en/security-advisories/information-disclosure-in-the-back-end.html
web, vendor-advisory
github.com /contao/contao/security/advisories/GHSA-4mvc-qc5w-v5qr
web
nvd.nist.gov /vuln/detail/CVE-2019-19712
advisory
github.com /FriendsOfPHP/security-advisories/blob/master/contao/contao/CVE-2019-19712.yaml
web
github.com /FriendsOfPHP/security-advisories/blob/master/contao/core-bundle/CVE-2019-19712.yaml
web
github.com /contao/contao
package

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary