EUVD-2026-21591
GHSA-wvhv-qcqf-f3cx
CVSS 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
3Description
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.
Analysis
Critical authorization bypass in goshs (Go-based HTTP server) versions prior to 2.0.0-beta.4 allows unauthenticated attackers to upload, delete, and modify files in directories protected by .goshs ACL configurations. Attackers can execute state-changing operations (PUT uploads, POST /upload, directory creation via ?mkdir, file deletion via ?delete) without credentials, bypassing documented per-folder authentication mechanisms. …
Sign in for full analysis, threat intelligence, and remediation guidance.
Remediation
Within 24 hours: Identify all systems running goshs versions prior to 2.0.0-beta.4 using asset discovery tools; immediately isolate affected instances from untrusted networks or disable external access. Within 7 days: Upgrade goshs to version 2.0.0-beta.4 or later on all systems; validate .goshs ACL configurations are re-applied post-upgrade. …
Sign in for detailed remediation steps.
Priority Score
Share
External POC / Exploit Code
Leaving vuln.today