Vulnerability · Published Apr 10, 2026 · Assigned by GitHub_M
CVE-2026-40189goshs has a file-based ACL authorization bypass in goshs state-changing routes
Critical 9.3
In plain English
A critical-severity missing authorization in goshs from patrickhener. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 51% of all known vulnerabilities).
Official description
goshs is a SimpleHTTPServer written in Go. Prior to 2.0.0-beta.4, goshs enforces the documented per-folder .goshs ACL/basic-auth mechanism for directory listings and file reads, but it does not enforce the same authorization checks for state-changing routes. An unauthenticated attacker can upload files with PUT, upload files with multipart POST /upload, create directories with ?mkdir, and delete files with ?delete inside a .goshs-protected directory. By deleting the .goshs file itself, the attacker can remove the folder's auth policy and then access previously protected content without credentials. This results in a critical authorization bypass affecting confidentiality, integrity, and availability. This vulnerability is fixed in 2.0.0-beta.4.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/patrickhener/goshs | no fix listed | GHSA-wvhv-qcqf-f3cx |
| Go | github.com/patrickhener/goshs | no fix listed | GO-2026-5728 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| patrickhener | goshs | < 2.0.0-beta.4 |
Weakness: CWE-862 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N