CVE-2026-21857

Summary

REDAXO is a PHP-based content management system. Prior to version 5.20.2, authenticated users with backup permissions can read arbitrary files within the webroot via path traversal in the Backup addon's file export functionality. The Backup addon does not validate the EXPDIR POST parameter against the UI-generated allowlist of permitted directories. An attacker can supply relative paths containing ../ sequences (or even absolute paths inside the document root) to include any readable file in the generated .tar.gz archive. Version 5.20.2 fixes this issue.

Affected Software

Weaknesses

• CWE-24: CWE-24: Path Traversal: '../filedir'
• CWE-22: CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: partial

Additional References

• https://github.com/redaxo/redaxo/security/advisories/GHSA-824x-88xg-cwrv

References

• https://github.com/redaxo/redaxo/security/advisories/GHSA-824x-88xg-cwrv
• https://github.com/redaxo/redaxo/releases/tag/5.20.2

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