CVE-2026-121555 is a high-severity (CVSS 7.5) Missing Authentication vulnerability in DrizzleTime Foxel. Versions up to 2.4.0 are affected; the records list no fixed version yet, so check the vendor advisory below.
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.…
Exploitation Status
No confirmed exploitation observed yet
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2026-121555.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
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.
Affected Products
FoxelDrizzleTimeDetection & mitigation playbook
Vendor / applianceDetect
Inventory every DrizzleTime Foxel deployment and check each version against the affected-products list above.
Remediation status
The records we use list no fixed version for CVE-2026-121555 (versions up to 2.4.0 are affected). Check the DrizzleTime Foxel advisory for a patched release, and apply the workarounds below until you can upgrade.
Mitigate without a patch
Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.
Frequently Asked Questions
Is CVE-2026-121555 being exploited in your environment?
Detect and block the exploit chain at execution, on systems you cannot patch yet.