Unauthenticated file tampering via unchecked mutation routes
Published Apr 10, 2026 · Updated Apr 10, 2026
Missing authorization in goshs before 2.0.0-beta.4 allows remote attackers to alter protected folders through HTTP mutation routes. The PUT, multipart upload, mkdir, and delete handlers perform filesystem changes without resolving the effective .goshs ACL or applying its authentication check. Exploitation requires a deployment that relies on per-folder .goshs protection and permits file modification, deletion, and disclosure after removal of the policy file.
Summary
What happened
Missing authorization in goshs before 2.0.0-beta.4 allows remote attackers to alter protected folders through HTTP mutation routes. The PUT, multipart upload, mkdir, and delete handlers perform filesystem changes without resolving the effective .goshs ACL or applying its authentication check. Exploitation requires a deployment that relies on per-folder .goshs protection and permits file modification, deletion, and disclosure after removal of the policy file.
The record
- CVE
- CVE-2026-40189
- Published
- Apr 10, 2026
- Updated
- Apr 10, 2026
- Vendor
- Patrick Hener
- Product
- goshs
- Classifications
- CWE-862, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 10, 2026CVE publishedPublication date reported by the CVE source.
- Apr 10, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 2.0.0-beta.4
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
- Upstream .goshs ACL bypass proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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