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Vulnerability record · CVE-2026-21857 · published 7 January 2026

CVE-2026-21857: Redaxo path traversal vulnerability

Redaxo · Redaxo

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.

8.3 CVSS 4.0 High EPSS 0.54% · top 56.6% CWE-22 · Path traversalCWE-24 · CWE-24
8.3CVSS 4.0 base score
0.54%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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: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:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2018-18200Redaxo sql injection vulnerabilityThere is a SQL injection in Benutzerverwaltung in REDAXO before 5.6.4.EPSS 1.4%9.8CVE-2018-17831Redaxo sql injection vulnerabilityIn REDAXO before 5.6.3, a critical SQL injection vulnerability has been discovered in the rex_list class because of the prepareQuery function in core…EPSS 2.1%7.5CVE-2006-2843Redaxo vulnerabilityPHP remote file inclusion vulnerability in Redaxo 2.7.4 allows remote attackers to execute arbitrary PHP code via a URL in the (1) REX[INCLUDE_PATH] …EPSS 3.8%7.5CVE-2006-2844Redaxo vulnerabilityMultiple PHP remote file inclusion vulnerabilities in Redaxo 3.0 allow remote attackers to execute arbitrary PHP code via a URL in the REX[INCLUDE_PA…EPSS 3.8%7.5CVE-2006-2845Redaxo vulnerabilityPHP remote file inclusion vulnerability in Redaxo 3.0 up to 3.2 allows remote attackers to execute arbitrary PHP code via a URL in the REX[INCLUDE_PA…EPSS 3.8%7.2CVE-2025-64050Redaxo code injection vulnerabilityA Remote Code Execution (RCE) vulnerability in the template management component in REDAXO CMS 5.20.0 allows remote authenticated administrators to e…EPSS 0.91%7.2CVE-2024-46210Redaxo unrestricted file upload vulnerabilityAn arbitrary file upload vulnerability in the MediaPool module of Redaxo CMS v5.17.1 allows attackers to execute arbitrary code via uploading a craft…EPSS 0.56%7.2CVE-2024-46213Redaxo vulnerabilityREDAXO CMS v2.11.0 was discovered to contain a remote code execution (RCE) vulnerability.EPSS 1.0%

Source: NIST National Vulnerability Database (record CVE-2026-21857), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.