How severe is CVE-2021-40966?

CVE-2021-40966 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-40966 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-40966?

CVE-2021-40966 affects Prasathmani Tiny File Manager. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-40966?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-40966 published?

CVE-2021-40966 was published on 2021-09-15 and last updated on 2026-06-17.

CVE-2021-40966

CVE-2021-40966 is a medium-severity vulnerability in Prasathmani Tiny File Manager with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
CVSS v2: 3.5
EPSS exploit prediction: 1% (40th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Prasathmani Tiny File Manager
Published: 2021-09-15
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2021-40966?: 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.
How severe is CVE-2021-40966?: CVE-2021-40966 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-40966 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-40966?: CVE-2021-40966 affects Prasathmani Tiny File Manager. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-40966?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-40966 published?: CVE-2021-40966 was published on 2021-09-15 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:prasathmani:tiny_file_manager:*:*:*:*:*:*:*:*

More vulnerabilities in Prasathmani Tiny File Manager

CVE-2022-40916 — Critical (CVSS 9.8): Tiny File Manager v2.4.7 and below is vulnerable to session fixation.
CVE-2022-45476 — Critical (CVSS 9.8): Tiny File Manager version 2.4.8 executes the code of files uploaded by users of the application, instead of just…
CVE-2022-1000 — Critical (CVSS 9.8): Path Traversal in GitHub repository prasathmani/tinyfilemanager prior to 2.4.7.
CVE-2022-23044 — High (CVSS 8.8): Tiny File Manager version 2.4.8 allows an unauthenticated remote attacker to persuade users to perform unintended…
CVE-2021-45010 — High (CVSS 8.8): A path traversal vulnerability in the file upload functionality in tinyfilemanager.php in Tiny File Manager before…
CVE-2021-40965 — High (CVSS 8.8): A Cross-Site Request Forgery (CSRF) vulnerability exists in TinyFileManager all version up to and including 2.4.6 that…

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