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Vulnerabilities

Vulnerability · CVE-2026-107850

Contao: Improper access control in the preview links module

Published Oct 9, 2026 · catalog updated Oct 9, 2026 · Contao: Improper access control

Check if you run it

No confirmed exploitation is on record for CVE-2026-107850. EPSS is 0.19%. Act only if a listed version of Contao: Improper access control is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Contao: Improper access control).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium4.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.19%
Remediation
Advisory link
Affected products
Packagist contao/core-bundle

registers the preview access voter with the class , but the class shipped on disk is named . Symfony resolves the class with , gets , silently skips the interface based autoconfiguration that would have tagged it as a voter, and the now untagged private service is removed when the container is compiled. The application boots without a warning, and the ownership rule in is never executed. has no compensating SQL filter on , so any non administrator back end user whose group holds the module reads every preview link on the installation and lifts the already signed share URLs straight out of the list. Following one grants front end preview of the target page, with and with no page permission check, to anyone at all. ### Impact A non administrator back end user reads every preview link on the installation, including links created by administrators, and lifts the already signed share URLs out of the list. Following one grants front end preview of the target page with and with no page permission check at all, so unpublished or embargoed content becomes readable by a user who has no rights on those pages, and by anyone that user forwards the URL to. **Honesty caveat, stated because it bounds the severity.** on a record owned by someone else was denied in our lab by , so we do not claim that a foreign preview link can be edited or deleted.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Packagist contao/core-bundle5.7.1 → 5.7.12

How to fix CVE-2026-107850

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-107850. EPSS is 0.19%. Act only if a listed version of Contao: Improper access control is installed.

Which versions are affected?

Compare what you have installed with 5.7.1 → 5.7.12. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-639: Authorization Bypass Through User-Controlled Key; CWE-862: Missing Authorization. EPSS 0.19%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 9, 2026 · Catalog

    Detected

    registers the preview access voter with the class , but the class shipped on disk is named . Symfony resolves the class with , gets , silently skips the interface based autoconfiguration that would have tagged it as a voter, and the now untagged private service is removed when the container is compiled. The application boots without a warning, and the ownership rule in is never executed. has no co

  2. Oct 9, 2026 · Catalog

    Fix available

    Packagist contao/core-bundle 5.7.1 → 5.7.12

  3. Oct 9, 2026 · GitHub Advisory Database

    Fix available

    contao/core-bundle fixed in 5.7.12

  4. Oct 9, 2026 · GitHub Advisory Database

    Fix available

    contao/core-bundle fixed in 5.7.12

  5. Oct 9, 2026 · Catalog

    Updated

    registers the preview access voter with the class , but the class shipped on disk is named . Symfony resolves the class with , gets , silently skips the interface based autoconfiguration that would have tagged it as a voter, and the now untagged private service is removed when the container is compiled. The application boots without a warning, and the ownership rule in is never executed. has no co

Sources

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.