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CVE-2021-37794: A stored cross-site scripting (XSS) vulnerability exists in FileBrowser < v2.16.0 that allows an authentica...

A stored cross-site scripting (XSS) vulnerability exists in FileBrowser < v2.16.0 that allows an authenticated user authorized to upload a malicious .svg file which acts as a stored XSS payload. If this stored XSS payload is triggered by an administrator it will trigger malicious OS commands on the server running the FileBrowser instance.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

FileBrowser versions before 2.16.0 can let an authenticated uploader plant a malicious SVG file. If an administrator opens or renders that file, the stored script can reportedly lead to operating-system command execution on the server. This is not just browser impact; it may affect the host running FileBrowser.

Executive priority

Prioritize remediation for internet-facing or shared FileBrowser deployments where non-admin users can upload files. The issue has incomplete scoring data, but the described administrator-triggered path to server command execution makes delayed remediation risky.

Technical view

The CVE describes stored XSS in FileBrowser < v2.16.0 through authorized SVG upload. The payload persists as uploaded content and is triggered by administrator interaction. The source description states that triggering by an administrator can execute OS commands on the FileBrowser server. CVSS, CWE, and formal affected-product metadata are not provided.

Likely exposure

Exposure is most likely where FileBrowser before v2.16.0 is deployed and authenticated users can upload SVG files or other content later viewed by administrators.

Exploitation context

The provided sources do not show CISA KEV listing or active exploitation. Public references include a GitHub repository, a technical gist, and a fixing commit, so vulnerability details are publicly available. Exploitation requires authenticated upload rights and administrator interaction, based on the CVE description.

Researcher notes

Official CVE affected metadata lists vendor and product as n/a, but references and description identify FileBrowser. No CVSS vector, CWE, or confirmed exploitation evidence is supplied. Treat the OS command execution claim as source-stated behavior, not independently expanded beyond the bundle.

Mitigation direction

  • Upgrade FileBrowser to v2.16.0 or later after checking vendor guidance.
  • Restrict SVG uploads until patched or compensating controls are confirmed.
  • Limit upload permissions to trusted users only.
  • Avoid administrator preview of user-uploaded SVG files on vulnerable systems.
  • Review FileBrowser process privileges and reduce server-side blast radius.

Validation and detection

  • Inventory FileBrowser deployments and record exact versions.
  • Confirm whether any instance is older than v2.16.0.
  • Review role permissions for users allowed to upload files.
  • Check whether SVG uploads are enabled or commonly used.
  • Review recent uploaded SVG files and related administrator access history.
Prepared
Confidence
medium
Sources
5

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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.

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CVE-2021-37794 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

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.

0CVSS vectors
0Timeline events
0ADP providers
4Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.