CVE-2026-126663
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
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.
Fixes and workarounds
Fix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: VulnCheckFix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: VulnCheckFix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: VulnCheckAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| Contao Contao contao/core-bundle
composer |
≥ 4.0.0; < 5.3.54 (affected, semver) ≥ 5.4.0-RC1; < 5.7.17 (affected, semver) ≥ 6.0.0-RC1; < 6.0.6 (affected, semver) Other versions: unaffected |
CNA: VulnCheck |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 5.3 medium |
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N | CNA: VulnCheck |
| 3.1 / 4.3 medium |
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N | CNA: VulnCheck |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/contao/contao/security/advisories/GHSA-r7cf-mfp4-r23hCNA: VulnCheck · vendor-advisory
- https://github.com/contao/contao/commit/688c0f6213afbd000cd22ad0a44555eca80b40abCNA: VulnCheck · patch
- https://github.com/contao/contao/commit/0f7989eb5b28d85dcd441ef22f80f8af4f56433eCNA: VulnCheck · patch
- https://github.com/contao/contao/commit/e820e3c9d79a5c07f274558513c8db08a79bf804CNA: VulnCheck · patch
- https://github.com/contao/contao/releases/tag/5.3.54CNA: VulnCheck · release-notes
- https://github.com/contao/contao/releases/tag/5.7.17CNA: VulnCheck · release-notes
- https://github.com/contao/contao/releases/tag/6.0.6CNA: VulnCheck · release-notes
- https://github.com/contao/contao/blob/5.3.53/core-bundle/src/InsertTag/Resolver/LegacyInsertTag.php#L565-L582CNA: VulnCheck · technical-description
- 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-tagCNA: VulnCheck · third-party-advisory
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