CVE-2026-42091
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.
- CVSS 3.1
- 6.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N - EPSS
- 0.2% chance of exploitation in the next 30 days; higher than 5% of CVEs (scores of 2026-10-26)
- CWE
- CWE-352
- Published
- Modified
- Record from
- the NVD, synced
Affected
- goshs:goshs
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-rhf7-wvw3-vjvm | Go | github.com/patrickhener/goshs/v2 | <2.0.2 | 2.0.2 |
| GHSA-rhf7-wvw3-vjvm | Go | github.com/patrickhener/goshs | <=1.1.4 | no fix published |
| GO-2026-5625 | Go | github.com/patrickhener/goshs | all versions | no fix published |
| GO-2026-5625 | Go | goshs.de/goshs | all versions | no fix published |
| GO-2026-5625 | Go | goshs.de/goshs/v2 | <2.0.2 | 2.0.2 |