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PHP CVE-2026-21857

MEDIUM
Path Traversal (CWE-22)
2026-01-07 security-advisories@github.com GHSA-824x-88xg-cwrv
PHP Path Traversal Redaxo
6.5
CVSS 3.1 · GitHub Advisory
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Severity by source

GitHub Advisory PRIMARY
6.5 MEDIUM
AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

Lifecycle Timeline

4
Patch released
Mar 31, 2026 - 21:13 nvd
Patch available
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
PoC Detected
Jan 20, 2026 - 18:49 vuln.today
Public exploit code
CVE Published
Jan 07, 2026 - 23:15 nvd
MEDIUM 6.5

DescriptionGitHub Advisory

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.

AnalysisAI

Arbitrary file disclosure in REDAXO's Backup addon allows authenticated users with backup permissions to read any file within the webroot by bypassing directory validation in the file export function. An attacker can manipulate the EXPDIR parameter with path traversal sequences to include unauthorized files in exported archives. …

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Vulnerability AssessmentAI

Risk Assessment CVSS 6.5 (MEDIUM). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker (requires authentication) could exploit this vulnerability to compromise the affected system.
Remediation Monitor vendor advisories for a patch. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-21857 vulnerability details – vuln.today
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