What is CVE-2026-107842?

CVE-2026-107842 is a medium-severity vulnerability in Contao, classified under Information Disclosure. CVSS score: 5.3/10. Published 2026-10-09.

How severe is CVE-2026-107842?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Information disclosure in Contao

CVE-2026-107842

Contao is an Open Source CMS. From version 4.0.0 until 5.3.50 and 5.7.12, ModuleSearch can disclose protected page titles, URLs, and indexed context snippets to unauthenticated visitors when contao.search.index_protected is changed from enabled to disabled. Authorization metadata is stored per row in tl_search, but disabling the setting removes the protected-row filter without deleting rows indexed while protection was enabled. The protected pages continue to return an authorization response, so this issue exposes search metadata and indexed text rather than bypassing page access. This issue is fixed in versions 5.3.50 and 5.7.12.

Vulnerability class: Information Disclosure

Published 2026-10-09.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Contao — versions >= 4.0.0, < 5.3.50, >= 5.4.0-RC1, < 5.7.12

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

Frequently asked questions

What is CVE-2026-107842?: CVE-2026-107842 is a medium-severity vulnerability in Contao, classified under Information Disclosure. CVSS score: 5.3/10. Published 2026-10-09.
How severe is CVE-2026-107842?: Medium severity. CVSS v3 base score is 5.3 out of 10.