CVE-2026-121555 Details
Description
Foxel through 2.4.0 contains a missing authentication vulnerability that allows unauthenticated attackers to read files by requesting the /api/fs/stream and /api/fs/thumb endpoints. Attackers can supply a VFS mount prefix and relative path to retrieve full file contents or thumbnails across all mounts, bypassing PathRule permission grants.
A missing authentication vulnerability has been identified in Foxel versions through 2.4.0. This vulnerability allows unauthenticated attackers to read files by accessing the '/api/fs/stream' and '/api/fs/thumb' endpoints. Attackers can provide a VFS mount prefix and relative path to retrieve full file contents or thumbnails from all mounts, bypassing PathRule permission grants. The issue arises because these endpoints lack the necessary authentication and authorization checks, which are present in other similar read routes.
Foxel has released a patch for this vulnerability in version 2.4.0. Users should update to this version to address the missing authentication and authorization checks.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Nov 3, 2026CISA-ADP
Assessed Nov 3, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/DrizzleTime/Foxel | [email protected] | ProductVendor |
| https://github.com/DrizzleTime/Foxel/blob/v2.4.0/api/routers.py#L31 | [email protected] | Source CodeVendor |
| https://github.com/DrizzleTime/Foxel/blob/v2.4.0/domain/virtual_fs/api.py#L164-L182 | [email protected] | Source CodeVendor |
| https://github.com/DrizzleTime/Foxel/commit/73d9fa825e1004d37abb7b10faea0cd7f5bcb463 | [email protected] | Source CodeVendor |
| https://github.com/DrizzleTime/Foxel/issues/152 | [email protected] | ExploitIssue TrackingTechnical DescriptionVendor |
| https://www.vulncheck.com/advisories/foxel-through-2.4.0-unauthenticated-file-read-via-api-fs-stream-and-api-fs-thumb | [email protected] | AdvisoryBundleRemedy |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-306 | Missing Authentication for Critical Function | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| DrizzleTime Foxel | <= 2.4.0 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Nov 3, 2026 | CVE Modified | CISA-ADP |
| Nov 3, 2026 | New CVE Received | [email protected] |