How severe is CVE-2026-40885?

CVE-2026-40885 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-40885 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-40885?

CVE-2026-40885 primarily affects Goshs. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-40885?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-40885 have an EU (EUVD) identifier?

Yes. CVE-2026-40885 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-24273.

When was CVE-2026-40885 published?

CVE-2026-40885 was published on 2026-04-21 and last updated on 2026-06-17.

CVE-2026-40885

CVE-2026-40885 is a high-severity vulnerability in Goshs with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-200.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v4: 7.7
EPSS exploit prediction: 0% (23rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-24273
Weakness: CWE-200
Affected product: Goshs
Published: 2026-04-21
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2026-40885?: 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.
How severe is CVE-2026-40885?: CVE-2026-40885 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-40885 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-40885?: CVE-2026-40885 primarily affects Goshs. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-40885?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-40885 have an EU (EUVD) identifier?: Yes. CVE-2026-40885 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-24273.
When was CVE-2026-40885 published?: CVE-2026-40885 was published on 2026-04-21 and last updated on 2026-06-17.

References

https://github.com/patrickhener/goshs/security/advisories/GHSA-7h3j-592v-jcrp

Affected products (2)

cpe:2.3:a:goshs:goshs:2.0.0:beta4:*:*:*:go:*:*
cpe:2.3:a:goshs:goshs:2.0.0:beta5:*:*:*:go:*:*

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