Medium severity4.3NVD Advisory· Published Nov 11, 2026· Updated Nov 11, 2026
CVE-2026-126663
CVE-2026-126663
Description
Contao 4.0.0 before 5.3.54, 5.4.0 before 5.7.17, and 6.0.0 before 6.0.6 contains a path traversal vulnerability that allows content editors to read image files anywhere on the filesystem via the {{image::}} insert tag. Attackers can embed percent-encoded sequences like ..%2f that pass Validator::isInsecurePath() before rawurldecode(), making the frontend resize and serve readable image files outside the files directory.
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Affected products
1Patches
Vulnerability mechanics
References
9- github.com/contao/contao/blob/5.3.53/core-bundle/src/InsertTag/Resolver/LegacyInsertTag.phpnvd
- github.com/contao/contao/commit/0f7989eb5b28d85dcd441ef22f80f8af4f56433envd
- github.com/contao/contao/commit/688c0f6213afbd000cd22ad0a44555eca80b40abnvd
- github.com/contao/contao/commit/e820e3c9d79a5c07f274558513c8db08a79bf804nvd
- github.com/contao/contao/releases/tag/5.3.54nvd
- github.com/contao/contao/releases/tag/5.7.17nvd
- github.com/contao/contao/releases/tag/6.0.6nvd
- github.com/contao/contao/security/advisories/GHSA-r7cf-mfp4-r23hnvd
- www.vulncheck.com/advisories/contao-4.0.0-before-5.3.54-5.4.0-before-5.7.17-and-6.0.0-before-6.0.6-path-traversal-via-image-insert-tagnvd
News mentions
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