What is the CVSS score of CVE-2021-47749?

CVE-2021-47749 has a CVSS 3.1 base score of 5.5 (Medium). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N. EPSS exploitation probability: 0.2%.

Which versions of PHP are affected by CVE-2021-47749?

CVE-2021-47749 presents moderate security risk, a path traversal vulnerability rated CVSS 5.5. This could allow unauthorized file access. Proof-of-concept code is publicly available.

Is there a public PoC exploit available for CVE-2021-47749?

Yes, a public proof-of-concept exploit is available for CVE-2021-47749. Prioritise patching immediately. EPSS: 0.2%.

How to fix or mitigate CVE-2021-47749?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Review file handling controls.

PHP CVE-2021-47749

MEDIUM

Path Traversal (CWE-22)

2026-01-13 disclosure@vulncheck.com

PHP LFI Path Traversal Youphptube

5.5

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

5.5 MEDIUM

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

PoC Detected

Jan 26, 2026 - 16:15 vuln.today

Public exploit code

CVE Published

Jan 13, 2026 - 23:15 nvd

MEDIUM 5.5

DescriptionCVE.org

YouPHPTube <= 7.8 contains a local file inclusion vulnerability that allows unauthenticated attackers to access arbitrary files by manipulating the 'lang' parameter in GET requests. Attackers can exploit the path traversal flaw in locale/function.php to include and view PHP files outside the intended directory by using directory traversal sequences.

AnalysisAI

YouPHPTube <= 7.8 contains a local file inclusion vulnerability that allows unauthenticated attackers to access arbitrary files by manipulating the 'lang' parameter in GET requests. [CVSS 5.5 MEDIUM]

Technical ContextAI

Classified as CWE-22 (Path Traversal). Affects Youphptube. YouPHPTube <= 7.8 contains a local file inclusion vulnerability that allows unauthenticated attackers to access arbitrary files by manipulating the 'lang' parameter in GET requests. Attackers can exploit the path traversal flaw in locale/function.php to include and view PHP files outside the intended directory by using directory traversal sequences.

RemediationAI

Monitor vendor advisories for a patch. Validate and sanitize file path inputs. Use allowlists.

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CVE-2021-47749 vulnerability details – vuln.today

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PHP CVE-2021-47749

Severity by source

CVSS VectorNVD

Lifecycle Timeline

DescriptionCVE.org

AnalysisAI

Technical ContextAI

RemediationAI

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External POC / Exploit Code