goshs: Authentication Bypass Using an Alternate Path or Channel
CVE-2026-34581 is a high-severity authentication bypass using an alternate path or channel vulnerability in goshs from Patrickhener, with a CVSS 3.1 base score of 8.1 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, but only if a user takes part, for example by opening a link or file. Affected goshs versions: >= 1.1.0, < 2.0.0-beta.2. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.4% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Check which version of goshs you run against the affected versions below, and install the vendor's latest release.
- Read the advisory on github.com for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
- Because the attack needs a user to take part, warn users about unexpected links and files related to this product until it is patched.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Patrickhener | goshs | >= 1.1.0, < 2.0.0-beta.2 | Not stated |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- RequiredA user must take an action such as opening a file or link.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- NoneAvailability is not affected.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N. Scored by CNA (github.com).
Official description
goshs is a SimpleHTTPServer written in Go. From version 1.1.0 to before version 2.0.0-beta.2, when using the Share Token it is possible to bypass the limited selected file download with all the gosh functionalities, including code exec. This issue has been patched in version 2.0.0-beta.2.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Authentication Bypass Using an Alternate Path or Channel
The product requires authentication, but the product has an alternate path or channel that does not require authentication.
How developers prevent this class of flaw
- Funnel all access through a single choke point to simplify how users can access a resource. For every access, perform a check to determine if the user has permissions to access the resource.
More Authentication Bypass Using an Alternate Path or Channel vulnerabilities (CWE-288)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: poc, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Patches and release notes
Other vulnerabilities in goshs
- 8.1 High severity
- 9.1 Critical severity
- 8.8 High severity
- 9.8 Critical severity
- 8.1 High severity
- 8.8 High severity
Recent Authentication Bypass Using an Alternate Path or Channel vulnerabilities
- 7.5 High severity
- 9.8 Critical severity
- 7.8 High severity
- 8.7 High severity
- 8.1 High severity
- 9.8 Critical severity
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