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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| contao | contao | 6.0.0-RC1 <6.0.6 | — |
| contao | contao | 5.4.0-RC1 <5.7.17 | — |
| contao | contao | 4.0.0 <5.3.54 | — |
Advisories 1
- WID-SEC-2026-4516 Contao: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 12, 2026
References
- https://github.com/contao/contao/security/advisories/GHSA-r7cf-mfp4-r23h
- https://github.com/contao/contao/commit/688c0f6213afbd000cd22ad0a44555eca80b40ab
- https://github.com/contao/contao/commit/0f7989eb5b28d85dcd441ef22f80f8af4f56433e
- https://github.com/contao/contao/commit/e820e3c9d79a5c07f274558513c8db08a79bf804
- https://github.com/contao/contao/releases/tag/5.3.54
- https://github.com/contao/contao/releases/tag/5.7.17
- https://github.com/contao/contao/releases/tag/6.0.6
- https://github.com/contao/contao/blob/5.3.53/core-bundle/src/InsertTag/Resolver/LegacyInsertTag.php#L565-L582
- https://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-tag