Security readout for executives and security teams
Plain-English summary
TinyFileManager versions up to and including 2.4.6 can store unsafe filenames. If a user uploads a file whose name contains HTML or JavaScript, that script may run in another user’s browser when they view the file manager. This can expose administrator sessions or sensitive file-management actions.
Executive priority
Treat this as a targeted administrative web-panel risk. Prioritize systems exposed to the internet or used by privileged staff, because stored XSS can turn routine file browsing into account or session compromise.
Technical view
CVE-2021-40966 is a stored cross-site scripting issue in /tinyfilemanager.php. The reported trigger is unsafe handling of uploaded filenames containing HTML and JavaScript. The CVE record does not provide CVSS, CWE, vendor advisory details, or a confirmed fixed version.
Likely exposure
Exposure is most likely where TinyFileManager is deployed and reachable by users who can upload files, especially administrative web file-management panels running version 2.4.6 or earlier.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation evidence. The public description says a malicious uploaded filename can execute script in browsers of users who access the server.
Researcher notes
Evidence is limited to the CVE description and public references. The affected range is stated as all TinyFileManager versions up to and including 2.4.6, but no authoritative fixed version or CVSS vector is included in the bundle.
Mitigation direction
- Inventory TinyFileManager deployments and identify versions at or below 2.4.6.
- Check the TinyFileManager project guidance for a fixed release or recommended remediation.
- Restrict TinyFileManager access to trusted administrators until remediation is confirmed.
- Limit or disable upload capability where it is not operationally required.
- Review upload and file-management permissions for least-privilege access.
Validation and detection
- Confirm whether /tinyfilemanager.php is present and externally reachable.
- Verify the deployed TinyFileManager version against the affected range.
- Review upload directories for suspicious filenames containing HTML or script indicators.
- Check web logs for unusual upload activity and access to TinyFileManager pages.
- Confirm remediation guidance from the project before closing the finding.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2021-40966 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/prasathmani/tinyfilemanagerCVE reference · x_refsource_MISC
- https://gist.github.com/omriinbar/953368dcdd9e5eeefd83920166099528CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.