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High · 8.3 Public exploit CVE-2026-21857 EUVD-2026-0817GHSA-824x-88xg-cwrv

Redaxo has Path Traversal in Backup Addon Leading to Arbitrary File Read

Published Jan 7, 2026 · Updated Jan 8, 2026 · Assigned by GitHub_M

Vendor: redaxo Product: redaxo Package: redaxo/source Ecosystem: Packagist

Description

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 products

VendorProductAffectedFixed
redaxo redaxo < 5.20.2 —

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 1 repository

  • lukasz-rybak/CVE-2026-21857 ★ 0 · Apr 11, 2026

    CVE-2026-21857 - Redaxo has Path Traversal in Backup Addon Leading to Arbitrary File Read

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

Affected packages

EcosystemPackageAffectedFixedRecord
Packagist redaxo/source < 5.20.2 5.20.2 GHSA-824x-88xg-cwrv

References