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TI-2026-29003 Aliases CVE-2026-40189GHSA-wvhv-qcqf-f3cx

goshs has a file-based ACL authorization bypass in goshs state-changing routes

Priority HIGH 81CWE-862Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-862.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00668 52nd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed goshs (patrickhener): 2.0.0-beta.4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
patrickhenergoshsbefore 2.0.0-beta.42.0.0-beta.4Patch availableCNA
—github.com/patrickhener/goshs (Go)up to 1.1.4—No fix listedGHSA-wvhv-qcqf-f3cx
  • goshs Vendorpatrickhener Affected before 2.0.0-beta.4 Fixed in 2.0.0-beta.4 Patch available CNA
  • github.com/patrickhener/goshs (Go) Vendor— Affected up to 1.1.4 Fixed in — No fix listed GHSA-wvhv-qcqf-f3cx

CPE configurations NVD · 4

CPEVersionsRoleVendor
cpe:2.3:a:goshs:goshs:*:*:*:*:*:go:*:*before 2.0.0Vulnerablepatrickhener
cpe:2.3:a:goshs:goshs:2.0.0:beta1:*:*:*:go:*:*2.0.0 beta1Vulnerablepatrickhener
cpe:2.3:a:goshs:goshs:2.0.0:beta2:*:*:*:go:*:*2.0.0 beta2Vulnerablepatrickhener
cpe:2.3:a:goshs:goshs:2.0.0:beta3:*:*:*:go:*:*2.0.0 beta3Vulnerablepatrickhener
  • cpe:2.3:a:goshs:goshs:*:*:*:*:*:go:*:* Versions before 2.0.0 Vulnerable ·patrickhener
  • cpe:2.3:a:goshs:goshs:2.0.0:beta1:*:*:*:go:*:* Versions 2.0.0 beta1 Vulnerable ·patrickhener
  • cpe:2.3:a:goshs:goshs:2.0.0:beta2:*:*:*:go:*:* Versions 2.0.0 beta2 Vulnerable ·patrickhener
  • cpe:2.3:a:goshs:goshs:2.0.0:beta3:*:*:*:go:*:* Versions 2.0.0 beta3 Vulnerable ·patrickhener

Remediation

  • Fix · CNA goshs (patrickhener) Fixed in 2.0.0-beta.4

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-40189
  2. 2026-10-03 Alias added: GHSA-wvhv-qcqf-f3cx
  3. 2026-10-07 EPSS moved to the 50th–90th percentile

References

Exploit 1

Patch 1

Advisory 1

Other 2

  • TI-2026-29540 goshs: Empty-username SFTP password authentication bypass in goshs CVSS 3.1CRITICAL 9.8
  • TI-2026-27601 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in goshs CVSS 3.0CRITICAL 9.8
  • TI-2026-27529 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in goshs POST multipart upload CVSS 3.0CRITICAL 9.8
  • TI-2026-27528 goshs has an Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in goshs PUT Upload CVSS 3.0CRITICAL 9.8
  • TI-2026-29532 SFTP root escape via prefix-based path validation in goshs CVSS 4.0HIGH 8.7
  • TI-2026-26829 goshs has Auth Bypass via Share Token CVSS 3.1HIGH 8.1
See all 11 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences