CVE-2026-21857

CVSS v3 6.5 MEDIUM

6.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.2 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required HIGH

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

R

EDAXO 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.

References

Link	Resource
https://github.com/redaxo/redaxo/releases/tag/5.20.2	Release Notes
https://github.com/redaxo/redaxo/security/advisories/GHSA-824x-88xg-cwrv	Exploit Vendor Advisory
https://github.com/redaxo/redaxo/security/advisories/GHSA-824x-88xg-cwrv	Exploit Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:redaxo:redaxo:*:*:*:*:*:*:*:*

History

20 Jan 2026, 18:49

Type	Values Removed	Values Added
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 6.5
CPE		cpe:2.3:a:redaxo:redaxo::::::::
References	~~() https://github.com/redaxo/redaxo/releases/tag/5.20.2 -~~	() https://github.com/redaxo/redaxo/releases/tag/5.20.2 - Release Notes
References	~~() https://github.com/redaxo/redaxo/security/advisories/GHSA-824x-88xg-cwrv -~~	() https://github.com/redaxo/redaxo/security/advisories/GHSA-824x-88xg-cwrv - Exploit, Vendor Advisory
First Time		Redaxo redaxo Redaxo

08 Jan 2026, 19:15

Type	Values Removed	Values Added
References	~~() https://github.com/redaxo/redaxo/security/advisories/GHSA-824x-88xg-cwrv -~~	() https://github.com/redaxo/redaxo/security/advisories/GHSA-824x-88xg-cwrv -

07 Jan 2026, 23:15

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-01-07 23:15

Updated : 2026-01-20 18:49

NVD link : CVE-2026-21857

Mitre link : CVE-2026-21857

CVE.ORG link : CVE-2026-21857

JSON object : View

Products Affected

redaxo

CWE

CWE-22

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CWE-24

Path Traversal: '../filedir'

{"id": "CVE-2026-21857", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "[email protected]", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.5, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "HIGH", "confidentialityImpact": "HIGH"}, "impactScore": 5.2, "exploitabilityScore": 1.2}], "cvssMetricV40": [{"type": "Secondary", "source": "[email protected]", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 8.3, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "HIGH", "valueDensity": "NOT_DEFINED", "vectorString": "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", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "HIGH", "subIntegrityImpact": "HIGH", "vulnIntegrityImpact": "NONE", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "HIGH", "vulnConfidentialityImpact": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "published": "2026-01-07T23:15:50.830", "references": [{"url": "https://github.com/redaxo/redaxo/releases/tag/5.20.2", "tags": ["Release Notes"], "source": "[email protected]"}, {"url": "https://github.com/redaxo/redaxo/security/advisories/GHSA-824x-88xg-cwrv", "tags": ["Exploit", "Vendor Advisory"], "source": "[email protected]"}, {"url": "https://github.com/redaxo/redaxo/security/advisories/GHSA-824x-88xg-cwrv", "tags": ["Exploit", "Vendor Advisory"], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "[email protected]", "description": [{"lang": "en", "value": "CWE-22"}, {"lang": "en", "value": "CWE-24"}]}], "descriptions": [{"lang": "en", "value": "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."}], "lastModified": "2026-01-20T18:49:29.420", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:redaxo:redaxo:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "5BB9DA06-A124-4435-A4F0-D14EC2F291B8", "versionEndExcluding": "5.20.2"}], "operator": "OR"}]}], "sourceIdentifier": "[email protected]"}