CVE-2026-21857

HIGH EPSS 38.6%
Published Jan 7, 20265mo ago · Modified Jun 17, 20261w ago
8.3 CVSS 4.0
High
Find Similar
Published Jan 7, 2026 5mo ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
8.3
Exploitability
—
Impact
—
Vector string
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required High
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
38.6% percentile
Exploit & Patch Status
Public Exploit Known
No Patch Available

Weaknesses 2

CWE-22 Path Traversal Resource Mgmt
CWE-24

Affected Products 1

VendorProductVersionRange
redaxoredaxo* <5.20.2

References 2

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

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.