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TI-2026-17559 Aliases CVE-2026-21857GHSA-824x-88xg-cwrv

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

Priority HIGH 69CWE-22Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-22 and the CVSS impact.

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00535 45th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed redaxo (redaxo): 5.20.2redaxo/source (Packagist): 5.20.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
redaxoredaxobefore 5.20.25.20.2Patch availableCNA
—redaxo/source (Packagist)before 5.20.25.20.2Patch availableGHSA-824x-88xg-cwrv
  • redaxo Vendorredaxo Affected before 5.20.2 Fixed in 5.20.2 Patch available CNA
  • redaxo/source (Packagist) Vendor— Affected before 5.20.2 Fixed in 5.20.2 Patch available GHSA-824x-88xg-cwrv

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:redaxo:redaxo:*:*:*:*:*:*:*:*before 5.20.2Vulnerableredaxo
  • cpe:2.3:a:redaxo:redaxo:*:*:*:*:*:*:*:* Versions before 5.20.2 Vulnerable ·redaxo

Remediation

  • Fix · CNA redaxo (redaxo) Fixed in 5.20.2
  • Fix · GHSA-824x-88xg-cwrv redaxo/source (Packagist) Fixed in 5.20.2 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-21857
  2. 2026-10-03 Alias added: GHSA-824x-88xg-cwrv

References

Exploit 1

Advisory 1

Other 2

  • TI-2025-39517 A Remote Code Execution (RCE) vulnerability in the template management component in… CVSS 3.1HIGH 7.2
  • TI-2024-30898 REDAXO CMS v2.11.0 was discovered to contain a remote code execution (RCE) vulnerability. CVSS 3.1HIGH 7.2
  • TI-2024-30896 An arbitrary file upload vulnerability in the MediaPool module of Redaxo CMS v5.17.1… CVSS 3.1HIGH 7.2
  • TI-2024-16680 Redaxo v5.15.1 was discovered to contain a remote code execution (RCE) vulnerability via… CVSS 3.1HIGH 7.2
  • TI-2024-16678 An issue was discovered in REDAXO version 5.15.1, allows attackers to execute arbitrary… CVSS 3.1HIGH 7.2
  • TI-2016-09229 Redaxo CMS 5.2 Cross-Site Request Forgery via users endpoint CVSS 4.0MEDIUM 6.9
See all 30 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences