CVE-2026-107850

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Source
https://cve.org/CVERecord?id=CVE-2026-107850
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-107850.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-107850
Aliases
Published
2026-10-09T20:25:02Z
Modified
2026-10-10T10:45:27Z
Severity
  • 4.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N CVSS Calculator
Summary
Contao: Improper access control in the preview links module
Details

Contao is an Open Source CMS. From version 5.7.1 until 5.7.12, core-bundle/config/services.yaml registers the preview access voter as Contao\CoreBundle\Security\Voter\DataContainer\PreviewAccessVoter although the shipped class is PreviewVoter. Symfony therefore omits voter autoconfiguration and removes the private service, so PreviewVoter::hasAccess() never enforces ownership. A non-admin backend user with the preview_link module can list every tl_preview_link record, obtain signed share URLs created by other users, and use them to view unpublished pages with showUnpublished despite lacking page permission. The advisory does not establish editing or deletion of foreign links. This issue is fixed in version 5.7.12.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-639",
        "CWE-862"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/107xxx/CVE-2026-107850.json"
}
References

Affected packages

Git / github.com/contao/contao

Affected ranges

Type
GIT
Repo
https://github.com/contao/contao
Events
Introduced
1b519a6e3dee78b99a26f267411eacebd0b4d01c
Fixed
a6543f49a92187a7368f51b290179c4795386e23
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "5.7.1"
        },
        {
            "fixed": "5.7.12"
        }
    ],
    "source": "AFFECTED_FIELD"
}

Affected versions

5.*
5.7.1
5.7.10
5.7.11
5.7.2
5.7.3
5.7.4
5.7.5
5.7.6
5.7.7
5.7.8
5.7.9

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-107850.json"