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CVE-2026-107844

MEDIUM 5.3

Published 2026-10-09 · Last modified 2026-10-14

Contao is an Open Source CMS. From version 5.0.0 until 5.3.50 and 5.7.12, ImagesController joins the user-controlled {path} parameter to the configured image target directory with Path::join() but does not use Path::isBasePath() to verify that the canonical path remains inside that directory. An unauthenticated request containing encoded parent-directory segments can therefore return files under the project directory through BinaryFileResponse when their names use an extension allowed by contao.image.valid_extensions. The route can also reveal whether arbitrary paths exist, and debug responses can disclose absolute filesystem paths, but paths below the upload directory were not shown to be readable. This issue is fixed in versions 5.3.50 and 5.7.12.

NO EXPLOITATION SIGNALS

No known exploitation, public exploit, or elevated probability at this time. Track for changes.

Exploitation likelihood

0.3%chance of exploitation in 30 days · 24th percentile

○ In CISA KEV ○ Catalogued PoC

Impact if exploited

5.3CVSS 3.1 · MEDIUM

  • ConfidentialityLow
  • IntegrityNone
  • AvailabilityNone

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ✓Privileges: No account or privileges required
  • ✓User interaction: No user interaction needed
  • ✓Complexity: No special conditions — reliably repeatable

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

No public PoC is currently catalogued.

Search for new PoCs

Search GitHub now — results may be empty or unverified.

Tracked sources are checked daily for recent CVEs, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.

Data snapshot:

Affected

Vendors Contao

Products Contao

Weakness (CWE)

  • CWE-22: : Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References and research data (JSON)

Packages and version ranges

Each advisory describes its own package and affected ranges. A boundary applies to that range; it is not a universal upgrade recommendation.

  • contao/core-bundle Packagist

    pkg:composer/contao/core-bundle

    ECOSYSTEM range
    • Introduced version (included): 4.1.0
    • Fixed boundary (excluded): 5.3.50
    390 explicitly listed affected versions

    4.1.0, 4.1.1, 4.1.2, 4.1.3, 4.10.0, 4.10.0-RC1, 4.10.0-RC2, 4.10.0-RC3, 4.10.0-RC4, 4.10.1, 4.10.2, 4.10.3, 4.10.4, 4.10.5, 4.10.6, 4.10.7, 4.11.0, 4.11.0-RC1, 4.11.0-RC2, 4.11.1, 4.11.2, 4.11.3, 4.11.4, 4.11.5, 4.11.6, 4.11.7, 4.11.8, 4.11.9, 4.12.0, 4.12.0-RC1, 4.12.0-RC2, 4.12.0-RC3, 4.12.1, 4.12.2, 4.12.3, 4.12.4, 4.12.5, 4.12.6, 4.12.7, 4.13.0, 4.13.0-RC1, 4.13.0-RC2, 4.13.0-RC3, 4.13.1, 4.13.10, 4.13.11, 4.13.12, 4.13.13, 4.13.14, 4.13.15, 4.13.16, 4.13.17, 4.13.18, 4.13.19, 4.13.2, 4.13.20, 4.13.21, 4.13.22, 4.13.23, 4.13.24, 4.13.25, 4.13.26, 4.13.27, 4.13.28, 4.13.29, 4.13.3, 4.13.30, 4.13.31, 4.13.32, 4.13.33, 4.13.34, 4.13.35, 4.13.36, 4.13.37, 4.13.38, 4.13.39, 4.13.4, 4.13.40, 4.13.41, 4.13.42, 4.13.43, 4.13.44, 4.13.45, 4.13.46, 4.13.47, 4.13.48, 4.13.49, 4.13.5, 4.13.50, 4.13.51, 4.13.52, 4.13.53, 4.13.54, 4.13.55, 4.13.56, 4.13.57, 4.13.58, 4.13.6, 4.13.7, 4.13.8, 4.13.9, 4.2.0, 4.2.0-RC1, 4.2.0-beta1, 4.2.1, 4.2.2, 4.2.3, 4.2.4, 4.2.5, 4.3.0, 4.3.0-RC1, 4.3.1, 4.3.10, 4.3.11, 4.3.2, 4.3.3, 4.3.4, 4.3.5, 4.3.6, 4.3.7, 4.3.8, 4.3.9, 4.4.0, 4.4.0-RC1, 4.4.0-RC2, 4.4.0-beta1, 4.4.1, 4.4.10, 4.4.11, 4.4.12, 4.4.13, 4.4.14, 4.4.15, 4.4.16, 4.4.17, 4.4.18, 4.4.19, 4.4.2, 4.4.20, 4.4.21, 4.4.22, 4.4.23, 4.4.24, 4.4.25, 4.4.26, 4.4.27, 4.4.28, 4.4.29, 4.4.3, 4.4.30, 4.4.31, 4.4.32, 4.4.33, 4.4.34, 4.4.35, 4.4.36, 4.4.37, 4.4.38, 4.4.39, 4.4.4, 4.4.40, 4.4.41, 4.4.42, 4.4.43, 4.4.44, 4.4.45, 4.4.46, 4.4.47, 4.4.48, 4.4.49, 4.4.5, 4.4.50, 4.4.51, 4.4.52, 4.4.53, 4.4.54, 4.4.55, 4.4.56, 4.4.57, 4.4.6, 4.4.7, 4.4.8, 4.4.9, 4.5.0, 4.5.0-RC1, 4.5.0-RC2, 4.5.0-beta1, 4.5.0-beta2, 4.5.0-beta3, 4.5.1, 4.5.10, 4.5.11, 4.5.12, 4.5.13, 4.5.14, 4.5.2, 4.5.3, 4.5.4, 4.5.5, 4.5.6, 4.5.7, 4.5.8, 4.5.9, 4.6.0, 4.6.0-RC1, 4.6.0-RC2, 4.6.0-RC3, 4.6.1, 4.6.10, 4.6.11, 4.6.12, 4.6.13, 4.6.14, 4.6.2, 4.6.3, 4.6.4, 4.6.5, 4.6.6, 4.6.7, 4.6.8, 4.6.9, 4.7.0, 4.7.0-RC1, 4.7.0-RC2, 4.7.0-RC3, 4.7.0-RC4, 4.7.1, 4.7.2, 4.7.3, 4.7.4, 4.7.5, 4.7.6, 4.7.7, 4.8.0, 4.8.0-RC1, 4.8.0-RC2, 4.8.1, 4.8.2, 4.8.3, 4.8.4, 4.8.5, 4.8.6, 4.8.7, 4.8.8, 4.9.0, 4.9.0-RC1, 4.9.0-RC2, 4.9.1, 4.9.10, 4.9.11, 4.9.12, 4.9.13, 4.9.14, 4.9.15, 4.9.16, 4.9.17, 4.9.18, 4.9.19, 4.9.2, 4.9.20, 4.9.21, 4.9.22, 4.9.23, 4.9.24, 4.9.25, 4.9.26, 4.9.27, 4.9.28, 4.9.29, 4.9.3, 4.9.30, 4.9.31, 4.9.32, 4.9.33, 4.9.34, 4.9.35, 4.9.36, 4.9.37, 4.9.38, 4.9.39, 4.9.4, 4.9.40, 4.9.41, 4.9.42, 4.9.5, 4.9.6, 4.9.7, 4.9.8, 4.9.9, 5.0.0, 5.0.0-RC1, 5.0.0-RC2, 5.0.0-RC3, 5.0.0-RC4, 5.0.1, 5.0.10, 5.0.2, 5.0.3, 5.0.4, 5.0.5, 5.0.6, 5.0.7, 5.0.8, 5.0.9, 5.1.0, 5.1.0-RC1, 5.1.0-RC2, 5.1.0-RC3, 5.1.1, 5.1.10, 5.1.11, 5.1.2, 5.1.3, 5.1.4, 5.1.5, 5.1.6, 5.1.7, 5.1.8, 5.1.9, 5.2.0, 5.2.0-RC1, 5.2.0-RC2, 5.2.0-RC3, 5.2.0-RC4, 5.2.0-RC5, 5.2.0-RC6, 5.2.1, 5.2.10, 5.2.2, 5.2.3, 5.2.4, 5.2.5, 5.2.6, 5.2.7, 5.2.8, 5.2.9, 5.3.0, 5.3.0-RC1, 5.3.0-RC2, 5.3.0-RC3, 5.3.0-RC4, 5.3.1, 5.3.10, 5.3.11, 5.3.12, 5.3.13, 5.3.14, 5.3.15, 5.3.16, 5.3.17, 5.3.18, 5.3.19, 5.3.2, 5.3.20, 5.3.21, 5.3.22, 5.3.23, 5.3.24, 5.3.25, 5.3.26, 5.3.27, 5.3.28, 5.3.29, 5.3.3, 5.3.30, 5.3.31, 5.3.32, 5.3.33, 5.3.34, 5.3.35, 5.3.36, 5.3.37, 5.3.38, 5.3.39, 5.3.4, 5.3.40, 5.3.41, 5.3.42, 5.3.43, 5.3.44, 5.3.45, 5.3.46, 5.3.47, 5.3.48, 5.3.49, 5.3.5, 5.3.6, 5.3.7, 5.3.8, 5.3.9

    Additional upstream package constraints
    {
  "database": {
    "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-mrvp-7wmx-5m4h/GHSA-mrvp-7wmx-5m4h.json"
  }
}
    GitHub Advisory Database · GHSA-mrvp-7wmx-5m4h · Updated 2026-10-09T21:00:10.323754314Z
  • contao/core-bundle Packagist

    pkg:composer/contao/core-bundle

    ECOSYSTEM range
    • Introduced version (included): 5.4.0-RC1
    • Fixed boundary (excluded): 5.7.12
    71 explicitly listed affected versions

    5.4.0, 5.4.0-RC1, 5.4.0-RC2, 5.4.0-RC3, 5.4.0-RC4, 5.4.1, 5.4.10, 5.4.11, 5.4.12, 5.4.13, 5.4.14, 5.4.2, 5.4.3, 5.4.4, 5.4.5, 5.4.6, 5.4.7, 5.4.8, 5.4.9, 5.5.0, 5.5.0-RC1, 5.5.0-RC2, 5.5.0-RC3, 5.5.0-RC4, 5.5.1, 5.5.10, 5.5.11, 5.5.12, 5.5.13, 5.5.14, 5.5.15, 5.5.16, 5.5.2, 5.5.3, 5.5.4, 5.5.5, 5.5.6, 5.5.7, 5.5.8, 5.5.9, 5.6.0, 5.6.0-RC1, 5.6.0-RC2, 5.6.0-RC3, 5.6.1, 5.6.10, 5.6.11, 5.6.2, 5.6.3, 5.6.4, 5.6.5, 5.6.6, 5.6.7, 5.6.8, 5.6.9, 5.7.0, 5.7.0-RC1, 5.7.0-RC2, 5.7.0-RC3, 5.7.0-RC4, 5.7.1, 5.7.10, 5.7.11, 5.7.2, 5.7.3, 5.7.4, 5.7.5, 5.7.6, 5.7.7, 5.7.8, 5.7.9

    Additional upstream package constraints
    {
  "database": {
    "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-mrvp-7wmx-5m4h/GHSA-mrvp-7wmx-5m4h.json"
  }
}
    GitHub Advisory Database · GHSA-mrvp-7wmx-5m4h · Updated 2026-10-09T21:00:10.323754314Z

All CVSS metrics

  • MEDIUM 5.3 v3.1 · CNA Primary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
  • MEDIUM 5.3 v3.1 · NVD Secondary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References

Advisories

Technical & other

Sources: NVD · CVE.org · EPSS