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Vulnerabilities

Vulnerability · CVE-2026-107844

Contao: Path traversal in the images controller

Published Oct 9, 2026 · catalog updated Oct 9, 2026 · Contao: Path traversal in

Check if you run it

No confirmed exploitation is on record for CVE-2026-107844. EPSS is 0.31%. Act only if a listed version of Contao: Path traversal in is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Contao: Path traversal in).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.31%
Remediation
Advisory link
Affected products
Packagist contao/core-bundle

joins the user controlled onto the configured image target directory with , which canonicalises segments, and never calls 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 . Reads are bounded to the extensions in , 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 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 ( , , , , , , , , , ). 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 .

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Packagist contao/core-bundle4.1.0 → 5.3.50
  • Packagist contao/core-bundle5.4.0-RC1 → 5.7.12

How to fix CVE-2026-107844

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-107844. EPSS is 0.31%. Act only if a listed version of Contao: Path traversal in is installed.

Which versions are affected?

Compare what you have installed with 4.1.0 → 5.3.50, 5.4.0-RC1 → 5.7.12. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-22: Path Traversal. EPSS 0.31%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Nginx security

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 9, 2026 · Catalog

    Detected

    joins the user controlled onto the configured image target directory with , which canonicalises segments, and never calls 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 . Reads are bounded to the extensions in , and paths below the upload directory fail for an unrelated reason,

  2. Oct 9, 2026 · Catalog

    Fix available

    Packagist contao/core-bundle 4.1.0 → 5.3.50

  3. Oct 9, 2026 · Catalog

    Fix available

    Packagist contao/core-bundle 5.4.0-RC1 → 5.7.12

  4. Oct 9, 2026 · GitHub Advisory Database

    Fix available

    contao/core-bundle fixed in 5.3.50; contao/core-bundle fixed in 5.7.12

  5. Oct 9, 2026 · GitHub Advisory Database

    Fix available

    contao/core-bundle fixed in 5.3.50

  6. Oct 9, 2026 · GitHub Advisory Database

    Fix available

    contao/core-bundle fixed in 5.7.12

  7. Oct 9, 2026 · Catalog

    Updated

    joins the user controlled onto the configured image target directory with , which canonicalises segments, and never calls 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 . Reads are bounded to the extensions in , and paths below the upload directory fail for an unrelated reason,

Sources

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.