CVE-2021-40966

Name: CVE-2021-40966
Creator: NVD / NIST
Published: 2021-09-15T18:15:09.523+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 0.52%

Last modified Jun 17, 2026

CVE-2021-40966 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. A Stored XSS exists in TinyFileManager All version up to and including 2.4.6 in /tinyfilemanager.php when the server is given a file that contains HTML and javascript in its name. A malicious user can upload a file with a malicious filename containing javascript code and it will run on any user browser when they access the server.. EPSS estimates a 0.52% chance of exploitation in the next 30 days.

Description

A Stored XSS exists in TinyFileManager All version up to and including 2.4.6 in /tinyfilemanager.php when the server is given a file that contains HTML and javascript in its name. A malicious user can upload a file with a malicious filename containing javascript code and it will run on any user browser when they access the server.

Metrics

CVSS 3.1

5.4/10

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

EPSS Probability

0.52%

40.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Prasathmani	Tiny File Manager	<= 2.4.6

References

https://gist.github.com/omriinbar/953368dcdd9e5eeefd83920166099528Third Party Advisory
https://github.com/prasathmani/tinyfilemanagerProduct, Third Party Advisory
https://gist.github.com/omriinbar/953368dcdd9e5eeefd83920166099528Third Party Advisory
https://github.com/prasathmani/tinyfilemanagerProduct, Third Party Advisory

Timeline

Published: Sep 15, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-40966?

How severe is CVE-2021-40966?

CVE-2021-40966 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 0.52% probability of exploitation in the next 30 days.

How do I fix CVE-2021-40966?

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-2021-40966?

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

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Source: NVD / NIST