CVE-2021-47749

Name: CVE-2021-47749
Creator: NVD / NIST
Published: 2026-01-13T23:15:48.913+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.7/10EPSS 1.63%

Last modified Jun 17, 2026

CVE-2021-47749 is a high-severity vulnerability rated 8.7/10 on the CVSS scale. 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.. EPSS estimates a 1.63% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

5.5/10

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

CVSS 4.0

8.7/10

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/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

EPSS Probability

1.63%

73.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-22

Affected Software

Vendor	Product	Versions
Youphptube	Youphptube	<= 7.8

References

https://web.archive.org/web/20170506141644/https://www.youphptube.com/Not Applicable
https://www.exploit-db.com/exploits/51101Exploit, Third Party Advisory, VDB Entry
https://www.vulncheck.com/advisories/youphptube-directory-traversalThird Party Advisory
https://www.exploit-db.com/exploits/51101Exploit, Third Party Advisory, VDB Entry

Timeline

Published: Jan 13, 2026
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-47749?

How severe is CVE-2021-47749?

CVE-2021-47749 has a CVSS score of 8.7/10 (HIGH severity). The EPSS model estimates a 1.63% probability of exploitation in the next 30 days.

How do I fix CVE-2021-47749?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-47749?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST