All vulnerabilities
CVE-2026-107844GHSA-mrvp-7wmx-5m4h

contao/core-bundle: Contao: Path traversal in the images controller

contao contao/core-bundlecomposerLibraries & packages
Open in ThreatlineRecord JSON
CVSS
5.3Medium
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.31%Chance of exploitation activity in the next 30 days, higher than 22% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in5.3.50Also 5.7.12GitHub
Published9 Oct 2026Updated 14 Oct 2026CVE List

What fixes it

  • 5.3.50contao/core-bundle, composerGitHubcomposer require "contao/core-bundle:^5.3.50"
  • 5.7.12contao/core-bundle, composerGitHubcomposer require "contao/core-bundle:^5.7.12"
  • 5.3.50contao/core-bundle, PackagistOSVcomposer require "contao/core-bundle:^5.3.50"
  • 5.7.12contao/core-bundle, PackagistOSVcomposer require "contao/core-bundle:^5.7.12"

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

ImagesController joins the user controlled {path} onto the configured image target directory with Path::join(), which canonicalises .. segments, and never calls Path::isBasePath() to confirm the result stayed inside that directory. An unauthenticated GET with percent encoded dot segments therefore escapes the directory and the file is returned by BinaryFileResponse. Reads are bounded to the extensions in contao.image.valid_extensions, and paths below the upload directory fail for an unrelated reason, so this is reported as a missing boundary check rather than as a general arbitrary file read. Both Apache with the shipped public/.htaccess and nginx with the documented configuration are affected.

Impact

Any unauthenticated visitor can read files that are deliberately kept outside the document root, anywhere under the project directory, as long as the name ends in one of contao.image.valid_extensions (jpg, jpeg, gif, png, tif, tiff, bmp, svg, svgz, webp). The route also acts as an existence oracle for arbitrary paths, and on a debug enabled instance the 404 message discloses the absolute filesystem path.

Honesty caveat, stated because it lowers the severity. The reporter could not use this to read protected member folders: every path below the upload directory returns 500 for the reason given under Details, so the practically reachable set is image typed files outside files/.

Text from GitHub Advisory Database

Affected versions 106

  • contao/core-bundle, composer>= 4.1.0, < 5.3.50GitHub
  • contao/core-bundle, composer>= 5.4.0-RC1, < 5.7.12GitHub
  • contaoaffected: >= 5.0.0, < 5.3.50CVE List
  • contaoaffected: >= 5.4.0-RC1, < 5.7.12CVE List
  • contao/core-bundle, Packagistfrom 4.1.0, fixed in 5.3.50OSV
  • contao/core-bundle, Packagist4.1.0OSV
  • contao/core-bundle, Packagist4.1.1OSV
  • contao/core-bundle, Packagist4.1.2OSV
  • contao/core-bundle, Packagist4.1.3OSV
  • contao/core-bundle, Packagist4.10.0OSV
  • contao/core-bundle, Packagist4.10.0-RC1OSV
  • contao/core-bundle, Packagist4.10.0-RC2OSV
  • contao/core-bundle, Packagist4.10.0-RC3OSV
  • contao/core-bundle, Packagist4.10.0-RC4OSV
  • contao/core-bundle, Packagist4.10.1OSV
  • contao/core-bundle, Packagist4.10.2OSV
  • contao/core-bundle, Packagist4.10.3OSV
  • contao/core-bundle, Packagist4.10.4OSV
  • contao/core-bundle, Packagist4.10.5OSV
  • contao/core-bundle, Packagist4.10.6OSV
  • contao/core-bundle, Packagist4.10.7OSV
  • contao/core-bundle, Packagist4.11.0OSV
  • contao/core-bundle, Packagist4.11.0-RC1OSV
  • contao/core-bundle, Packagist4.11.0-RC2OSV
  • contao/core-bundle, Packagist4.11.1OSV
  • contao/core-bundle, Packagist4.11.2OSV
  • contao/core-bundle, Packagist4.11.3OSV
  • contao/core-bundle, Packagist4.11.4OSV
  • contao/core-bundle, Packagist4.11.5OSV
  • contao/core-bundle, Packagist4.11.6OSV
  • contao/core-bundle, Packagist4.11.7OSV
  • contao/core-bundle, Packagist4.11.8OSV
  • contao/core-bundle, Packagist4.11.9OSV
  • contao/core-bundle, Packagist4.12.0OSV
  • contao/core-bundle, Packagist4.12.0-RC1OSV
  • contao/core-bundle, Packagist4.12.0-RC2OSV
  • contao/core-bundle, Packagist4.12.0-RC3OSV
  • contao/core-bundle, Packagist4.12.1OSV
  • contao/core-bundle, Packagist4.12.2OSV
  • contao/core-bundle, Packagist4.12.3OSV
  • contao/core-bundle, Packagist4.12.4OSV
  • contao/core-bundle, Packagist4.12.5OSV
  • contao/core-bundle, Packagist4.12.6OSV
  • contao/core-bundle, Packagist4.12.7OSV
  • contao/core-bundle, Packagist4.13.0OSV
  • contao/core-bundle, Packagist4.13.0-RC1OSV
  • contao/core-bundle, Packagist4.13.0-RC2OSV
  • contao/core-bundle, Packagist4.13.0-RC3OSV
  • contao/core-bundle, Packagist4.13.1OSV
  • contao/core-bundle, Packagist4.13.10OSV
  • contao/core-bundle, Packagist4.13.11OSV
  • contao/core-bundle, Packagist4.13.12OSV
  • contao/core-bundle, Packagist4.13.13OSV
  • contao/core-bundle, Packagist4.13.14OSV
  • contao/core-bundle, Packagist4.13.15OSV
  • contao/core-bundle, Packagistfrom 5.4.0-RC1, fixed in 5.7.12OSV
  • contao/core-bundle, Packagist5.4.0OSV
  • contao/core-bundle, Packagist5.4.0-RC1OSV
  • contao/core-bundle, Packagist5.4.0-RC2OSV
  • contao/core-bundle, Packagist5.4.0-RC3OSV
  • contao/core-bundle, Packagist5.4.0-RC4OSV
  • contao/core-bundle, Packagist5.4.1OSV
  • contao/core-bundle, Packagist5.4.10OSV
  • contao/core-bundle, Packagist5.4.11OSV
  • contao/core-bundle, Packagist5.4.12OSV
  • contao/core-bundle, Packagist5.4.13OSV
  • contao/core-bundle, Packagist5.4.14OSV
  • contao/core-bundle, Packagist5.4.2OSV
  • contao/core-bundle, Packagist5.4.3OSV
  • contao/core-bundle, Packagist5.4.4OSV
  • contao/core-bundle, Packagist5.4.5OSV
  • contao/core-bundle, Packagist5.4.6OSV
  • contao/core-bundle, Packagist5.4.7OSV
  • contao/core-bundle, Packagist5.4.8OSV
  • contao/core-bundle, Packagist5.4.9OSV
  • contao/core-bundle, Packagist5.5.0OSV
  • contao/core-bundle, Packagist5.5.0-RC1OSV
  • contao/core-bundle, Packagist5.5.0-RC2OSV
  • contao/core-bundle, Packagist5.5.0-RC3OSV
  • contao/core-bundle, Packagist5.5.0-RC4OSV
  • contao/core-bundle, Packagist5.5.1OSV
  • contao/core-bundle, Packagist5.5.10OSV
  • contao/core-bundle, Packagist5.5.11OSV
  • contao/core-bundle, Packagist5.5.12OSV
  • contao/core-bundle, Packagist5.5.13OSV
  • contao/core-bundle, Packagist5.5.14OSV
  • contao/core-bundle, Packagist5.5.15OSV
  • contao/core-bundle, Packagist5.5.16OSV
  • contao/core-bundle, Packagist5.5.2OSV
  • contao/core-bundle, Packagist5.5.3OSV
  • contao/core-bundle, Packagist5.5.4OSV
  • contao/core-bundle, Packagist5.5.5OSV
  • contao/core-bundle, Packagist5.5.6OSV
  • contao/core-bundle, Packagist5.5.7OSV
  • contao/core-bundle, Packagist5.5.8OSV
  • contao/core-bundle, Packagist5.5.9OSV
  • contao/core-bundle, Packagist5.6.0OSV
  • contao/core-bundle, Packagist5.6.0-RC1OSV
  • contao/core-bundle, Packagist5.6.0-RC2OSV
  • contao/core-bundle, Packagist5.6.0-RC3OSV
  • contao/core-bundle, Packagist5.6.1OSV
  • contao/core-bundle, Packagist5.6.10OSV
  • contao/core-bundle, Packagist5.6.11OSV
  • contao/core-bundle, Packagist5.6.2OSV
  • contao/core-bundle, Packagist5.6.3OSV
  • contao/core-bundle, Packagist5.6.4OSV

References 5