CVE-2026-42091 (GCVE-0-2026-42091)
Vulnerability from cvelistv5 – Published: 2026-05-04 17:24 – Updated: 2026-05-05 14:14
VLAI
EPSS
VEX
Title
goshs has Cross-Origin Arbitrary File Write via Missing CSRF on PUT and Wildcard CORS
Summary
goshs is a SimpleHTTPServer written in Go. Prior to version 2.0.2, the PUT upload handler (httpserver/updown.go) lacks the CSRF token validation that was added to the POST upload handler during the CVE-2026-40883 fix. Combined with the unconditional Access-Control-Allow-Origin: * on the OPTIONS preflight handler (httpserver/server.go), any website can write arbitrary files to a goshs instance through the victim's browser — bypassing network isolation (e.g. localhost, internal network). This issue has been patched in version 2.0.2.
Severity
6.5 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-05 13:07 UTC
CWE
- CWE-352 - Cross-Site Request Forgery (CSRF)
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/patrickhener/goshs/security/ad… | x_refsource_CONFIRM |
| https://github.com/patrickhener/goshs/commit/0e71… | x_refsource_MISC |
| https://github.com/patrickhener/goshs/releases/ta… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| patrickhener | goshs |
Affected:
< 2.0.2
|
guessed |
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FKIE_CVE-2026-42091
Vulnerability from fkie_nvd - Published: 2026-05-04 18:16 - Updated: 2026-06-17 10:47
Severity
Summary
goshs is a SimpleHTTPServer written in Go. Prior to version 2.0.2, the PUT upload handler (httpserver/updown.go) lacks the CSRF token validation that was added to the POST upload handler during the CVE-2026-40883 fix. Combined with the unconditional Access-Control-Allow-Origin: * on the OPTIONS preflight handler (httpserver/server.go), any website can write arbitrary files to a goshs instance through the victim's browser — bypassing network isolation (e.g. localhost, internal network). This issue has been patched in version 2.0.2.
References
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GHSA-RHF7-WVW3-VJVM
Vulnerability from github – Published: 2026-04-23 14:28 – Updated: 2026-05-04 20:11
VLAI
Summary
goshs has Cross-Origin Arbitrary File Write via Missing CSRF on PUT and Wildcard CORS
Details
Summary
The PUT upload handler (httpserver/updown.go) lacks the CSRF token validation that was added to the POST upload handler during the GHSA-jrq5-hg6x-j6g3 fix. Combined with the unconditional Access-Control-Allow-Origin: * on the OPTIONS preflight handler (httpserver/server.go), any website can write arbitrary files to a goshs instance through the victim's browser — bypassing network isolation (e.g. localhost, internal network).
Details
Root Cause 1 — Missing CSRF on PUT (httpserver/updown.go:19)
When GHSA-jrq5-hg6x-j6g3 was fixed (commit e3c3d37), checkCSRF() was added to the POST upload() function (line 78) but not to the PUT put() function directly above it in the same file. This means PUT requests are accepted without any CSRF token.
// POST — protected
func (fs *FileServer) upload(w http.ResponseWriter, req *http.Request) {
if !fs.checkCSRF(w, req) { return }
// ...
}
// PUT — unprotected
func (fs *FileServer) put(w http.ResponseWriter, req *http.Request) {
// No checkCSRF call
// ...
}
Root Cause 2 — Wildcard CORS (httpserver/server.go:126)
The OPTIONS handler unconditionally returns permissive CORS headers:
w.Header().Set("Access-Control-Allow-Origin", "*")
w.Header().Set("Access-Control-Allow-Methods", "POST, PUT, OPTIONS")
w.Header().Set("Access-Control-Allow-Headers", "Content-Type, Authorization")
This allows any website's JavaScript to pass the browser's CORS preflight check and send PUT requests to the goshs server.
PoC
Please extract the uploaded compressed file before proceeding
- bash poc.sh
Impact
- Arbitrary file write to the goshs webroot from any website the victim visits
- File overwrite — existing files can be silently replaced
Severity
6.5 (Medium)
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"severity": "MODERATE"
},
"details": "### Summary\nThe PUT upload handler (`httpserver/updown.go`) lacks the CSRF token validation that was added to the POST upload handler during the GHSA-jrq5-hg6x-j6g3 fix. Combined with the unconditional `Access-Control-Allow-Origin: *` on the OPTIONS preflight handler (`httpserver/server.go`), any website can write arbitrary files to a goshs instance through the victim\u0027s browser \u2014 bypassing network isolation (e.g. localhost, internal network).\n\n### Details\n**Root Cause 1 \u2014 Missing CSRF on PUT** (`httpserver/updown.go:19`)\n\nWhen GHSA-jrq5-hg6x-j6g3 was fixed (commit `e3c3d37`), `checkCSRF()` was added to the POST `upload()` function (line 78) but not to the PUT `put()` function directly above it in the same file. This means PUT requests are accepted without any CSRF token.\n\n```go\n// POST \u2014 protected \nfunc (fs *FileServer) upload(w http.ResponseWriter, req *http.Request) {\n if !fs.checkCSRF(w, req) { return }\n // ...\n}\n\n// PUT \u2014 unprotected \nfunc (fs *FileServer) put(w http.ResponseWriter, req *http.Request) {\n // No checkCSRF call\n // ...\n}\n```\n\n**Root Cause 2 \u2014 Wildcard CORS** (`httpserver/server.go:126`)\n\nThe OPTIONS handler unconditionally returns permissive CORS headers:\n\n```go\nw.Header().Set(\"Access-Control-Allow-Origin\", \"*\")\nw.Header().Set(\"Access-Control-Allow-Methods\", \"POST, PUT, OPTIONS\")\nw.Header().Set(\"Access-Control-Allow-Headers\", \"Content-Type, Authorization\")\n```\n\nThis allows any website\u0027s JavaScript to pass the browser\u0027s CORS preflight check and send PUT requests to the goshs server.\n\n### PoC\n[poc.zip](https://github.com/user-attachments/files/26828829/poc.zip)\n\nPlease extract the uploaded compressed file before proceeding\n\n1. bash poc.sh\n\u003cimg width=\"543\" height=\"376\" alt=\"\u1109\u1173\u110f\u1173\u1105\u1175\u11ab\u1109\u1163\u11ba 2026-04-17 \u110b\u1169\u1112\u116e 11 08 13\" src=\"https://github.com/user-attachments/assets/a695cbc8-133e-4e80-a2f5-9fe9fd36b569\" /\u003e\n\n\n\n\n### Impact\n- Arbitrary file write to the goshs webroot from any website the victim visits\n- File overwrite \u2014 existing files can be silently replaced",
"id": "GHSA-rhf7-wvw3-vjvm",
"modified": "2026-05-04T20:11:00Z",
"published": "2026-04-23T14:28:14Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/patrickhener/goshs/security/advisories/GHSA-rhf7-wvw3-vjvm"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42091"
},
{
"type": "WEB",
"url": "https://github.com/patrickhener/goshs/commit/0e715b94e10c3d1aa552276000f15f104dee2f32"
},
{
"type": "PACKAGE",
"url": "https://github.com/patrickhener/goshs"
},
{
"type": "WEB",
"url": "https://github.com/patrickhener/goshs/releases/tag/v2.0.2"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
}
],
"summary": "goshs has Cross-Origin Arbitrary File Write via Missing CSRF on PUT and Wildcard CORS"
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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