Secuno
ENNL
Book demo

CVE-2026-40189

Goshs broken access control

9.8 CRITICALPublic exploitEPSS 0.66%
  1. Published10 Apr 2026

Description

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Goshs2.0.0 · < 2.0.0

Remediation

Fixed in
Goshs≥ 2.0.0

References

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-891089.1
SAP Manufacturing Integration and Intelligence does not sufficiently enforce…
CVE-2026-1096408.1
Frappe ERPNext before 16.22.0 contains a missing authorization vulnerability that…
CVE-2026-843158.3
Nginx UI is a web user interface for the Nginx web server. Prior to 2.4.1, Nginx UI…
CVE-2026-571189.8
PraisonAI is a multi-agent teams system. Prior to praisonaiagents 1.6.59,…
CVE-2026-1092018.3
LogicalDOC Community Edition through 9.3 contains a missing authorization vulnerability…
CVE-2026-1091858.8
jshERP through 3.6 contains a missing authorization vulnerability in the UserController…

Frequently asked

Is CVE-2026-40189 being actively exploited?

CVE-2026-40189 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.66%.

How severe is CVE-2026-40189?

CVE-2026-40189 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.66% probability of exploitation.

Which products are affected by CVE-2026-40189?

Affected products include Goshs.

How do I fix CVE-2026-40189?

Upgrade affected software to a fixed version, for example Goshs 2.0.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-40189 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation worksBook a demo

Get Patch this first every Monday

Five vulnerabilities that matter this week, ranked on real exploitation. Plain language, one email, no spam.

You can unsubscribe with one click from every issue. We handle your details as described in our privacy policy.

Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.