CVE-2026-40189
goshs has a file-based ACL authorization bypass in goshs state-changing routes
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.
INFO
Published Date :
April 10, 2026, 8:16 p.m.
Last Modified :
April 14, 2026, 8:08 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | [email protected] | ||||
| CVSS 4.0 | CRITICAL | [email protected] |
Solution
- Update goshs to version 2.0.0-beta.4.
- Review and reapply ACLs for protected directories.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-40189.
| URL | Resource |
|---|---|
| https://github.com/patrickhener/goshs/commit/f212c4f4a126556bab008f79758e21a839ef2c0f | Patch |
| https://github.com/patrickhener/goshs/releases/tag/v2.0.0-beta.4 | Product Release Notes |
| https://github.com/patrickhener/goshs/security/advisories/GHSA-wvhv-qcqf-f3cx | Exploit Mitigation Vendor Advisory |
| https://github.com/patrickhener/goshs/security/advisories/GHSA-wvhv-qcqf-f3cx | Exploit Mitigation Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-40189 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-40189
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-40189 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-40189 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Apr. 14, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Added CPE Configuration OR *cpe:2.3:a:goshs:goshs:2.0.0:beta1:*:*:*:go:*:* *cpe:2.3:a:goshs:goshs:*:*:*:*:*:go:*:* versions up to (excluding) 2.0.0 *cpe:2.3:a:goshs:goshs:2.0.0:beta2:*:*:*:go:*:* *cpe:2.3:a:goshs:goshs:2.0.0:beta3:*:*:*:go:*:* Added Reference Type GitHub, Inc.: https://github.com/patrickhener/goshs/commit/f212c4f4a126556bab008f79758e21a839ef2c0f Types: Patch Added Reference Type GitHub, Inc.: https://github.com/patrickhener/goshs/releases/tag/v2.0.0-beta.4 Types: Product, Release Notes Added Reference Type GitHub, Inc.: https://github.com/patrickhener/goshs/security/advisories/GHSA-wvhv-qcqf-f3cx Types: Exploit, Mitigation, Vendor Advisory Added Reference Type CISA-ADP: https://github.com/patrickhener/goshs/security/advisories/GHSA-wvhv-qcqf-f3cx Types: Exploit, Mitigation, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Apr. 13, 2026
Action Type Old Value New Value Added Reference https://github.com/patrickhener/goshs/security/advisories/GHSA-wvhv-qcqf-f3cx -
New CVE Received by [email protected]
Apr. 10, 2026
Action Type Old Value New Value Added 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. Added CVSS V4.0 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 Added CWE CWE-862 Added Reference https://github.com/patrickhener/goshs/commit/f212c4f4a126556bab008f79758e21a839ef2c0f Added Reference https://github.com/patrickhener/goshs/releases/tag/v2.0.0-beta.4 Added Reference https://github.com/patrickhener/goshs/security/advisories/GHSA-wvhv-qcqf-f3cx