CVE-2026-107851
Description
Contao is an Open Source CMS. From version 5.7.0 until 5.7.12, TableAccessVoter::hasAccessToModule() in core-bundle/src/Security/Voter/DataContainer/TableAccessVoter.php caches authorization decisions using only $tokenHash, a hash of the user's security token, and omits the table returned by getDataSource(). If one request first checks a table allowed to the user and then a different denied table, the voter can reuse the allowed result, while DefaultDataContainerVoter can convert an incorrect abstention into a grant. A low-privileged backend user can consequently read, create, update, or delete records in tables outside assigned module permissions, including tables containing member or newsletter-subscriber data. This issue is fixed in version 5.7.12.
How to fix
- contao/core-bundle5.7.12 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| contao/core-bundlePackagist | 5.7.0 ≤ v < 5.7.12 | 5.7.12 |
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