CVE-2026-21857

MEDIUM

6.5

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.

CVE Details

CVSS v3.1 Score6.5

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredHIGH

User InteractionNONE

Published1/7/2026

Last Modified1/20/2026

Sourcenvd

Honeypot Sightings0

Affected Products

redaxo:redaxo

Weaknesses (CWE)

CWE-22CWE-24

References

https://github.com/redaxo/redaxo/releases/tag/5.20.2(security-advisories@github.com)

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

https://github.com/redaxo/redaxo/security/advisories/GHSA-824x-88xg-cwrv(134c704f-9b21-4f2e-91b3-4a467353bcc0)

IOC Correlations

No correlations recorded

This product uses data from the NVD API but is not endorsed or certified by the NVD.