CVE-2026-107842: Contao Protected Page Content Is Disclosed Vulnerability

MODERATE
Advisory Identifier: GHSA-x2rp-9qf7-2fmq
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CVSS 5.3
CWE-200
Published
Advisory Summary

CVE-2026-107842 is a MODERATE (CVSS 5.3) protected page content is disclosed vulnerability (CWE-200: Exposure of Sensitive Information to an Unauthorized Actor) affecting Contao libraries in the Packagist ecosystem. The issue involves protected page content is disclosed to anonymous visitors after contao.search.index_protected is disabled. Remediation is available by upgrading affected packages to version 5.3.50, 5.7.12.

CVE-2026-107842 at a Glance

CVE Identifier CVE-2026-107842
GHSA Identifier GHSA-x2rp-9qf7-2fmq
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
Affected Product Contao
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 5.3

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2026-107842

To remediate this vulnerability, upgrade all affected Contao dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

contao/core-bundle fixed: 5.3.50 
Upgrade contao/core-bundle to 5.3.50
contao/core-bundle fixed: 5.7.12 
Upgrade contao/core-bundle to 5.7.12
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for contao/core-bundle

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-107842, inspect your project dependencies for Contao:

inspect dependencies for contao/core-bundle

Analyze the terminal output to locate any version of Contao in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 5.3.50), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor, where the product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. In Contao, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

`ModuleSearch` decides whether to filter protected pages out of search results based on the current value of `contao.search.index_protected`, but the authorisation data lives per row in `tl_search`. Turning the setting off removes the filter without removing the rows, so protected pages that were indexed while it was on are returned to unauthenticated visitors such as title, URL and context snippet, even though the pages themselves still answer 401. ## Impact Disclosure of member-only page titles, URLs and indexed text to unauthenticated visitors through the site search. The pages themselves remain access-controlled, so this is not a page-access bypass. ## Credits This security vulnerability was found by @iRevivalx .

CVE-2026-107842 Affected Contao Versions

2 component(s)
Fixed Versions:
5.3.505.7.12
Product / Package Ecosystem Affected Versions Fixed Version
contao/core-bundle
 Packagist
≥ 4.0.0
< 5.3.50
5.3.50
contao/core-bundle
 Packagist
≥ 5.4.0-RC1
< 5.7.12
5.7.12

References

GitHub Advisory / Wiki ADVISORY
https://github.com/contao/contao/security/advisories/GHSA-x2rp-9qf7-2fmq
Security Fix Commit FIX COMMIT
https://github.com/contao/contao/commit/572686a113bca60f92cf2d0496cf3a74d0b6b457
Contao Source Repository REPOSITORY
https://github.com/contao/contao
Contao Release RELEASE
https://github.com/contao/contao/releases/tag/5.3.50
Contao Release RELEASE
https://github.com/contao/contao/releases/tag/5.7.12

Frequently Asked Questions

What is CVE-2026-107842?
CVE-2026-107842 is a security vulnerability in Contao involving Protected page content is disclosed to anonymous visitors after contao.search.index_protected is disabled under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor.
Which Contao versions are affected?
Affected versions include releases prior to 5.3.50, 5.7.12 across affected packages: contao/core-bundle.
What version fixes CVE-2026-107842?
Upgrading to 5.3.50, 5.7.12 (or the latest patched release for your respective branch) resolves the vulnerability.
Is contao/core-bundle affected?
Yes, contao/core-bundle is affected in releases prior to 5.3.50, 5.7.12. Upgrade your dependency to 5.3.50, 5.7.12 or later.
What is the CVSS score of CVE-2026-107842?
CVE-2026-107842 has a CVSS v3.1 base score of 5.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
What CWE is associated with CVE-2026-107842?
CVE-2026-107842 is classified under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor (The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.).
How can I check Packagist dependencies for CVE-2026-107842?
Run the dependency tree command: 'inspect dependencies for contao/core-bundle'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-x2rp-9qf7-2fmq",
  "modified" : "2026-10-09T20:54:09Z",
  "published" : "2026-10-09T20:54:09Z",
  "aliases" : [ "CVE-2026-107842" ],
  "summary" : "Contao: Protected page content is disclosed to anonymous visitors after contao.search.index_protected is disabled",
  "details" : "`ModuleSearch` decides whether to filter protected pages out of search results based on the current value of `contao.search.index_protected`, but the authorisation data lives per row in `tl_search`. Turning the setting off removes\nthe filter without removing the rows, so protected pages that were indexed while it was on are returned to unauthenticated visitors such as title, URL and context snippet, even though the pages themselves still answer 401.\n\n## Impact\n\nDisclosure of member-only page titles, URLs and indexed text to unauthenticated visitors through the site search. The pages themselves remain access-controlled, so this is not a page-access bypass.\n\n## Credits\n\nThis security vulnerability was found by @iRevivalx .",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "contao/core-bundle"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "4.0.0"
      }, {
        "fixed" : "5.3.50"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "contao/core-bundle"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "5.4.0-RC1"
      }, {
        "fixed" : "5.7.12"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/contao/contao/security/advisories/GHSA-x2rp-9qf7-2fmq"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/contao/contao/commit/572686a113bca60f92cf2d0496cf3a74d0b6b457"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/contao/contao"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/contao/contao/releases/tag/5.3.50"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/contao/contao/releases/tag/5.7.12"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-200" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-10-09T20:54:09Z",
    "nvd_published_at" : null
  }
}