CVE-2026-40885

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.

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CVSS v3.1 Score

8.8

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS — Exploit Prediction

0.0006

Probability of exploitation

0.20%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-200 CWE-200

Affected Products

Vendor	Product	Versions
goshs	goshs	All
goshs	goshs	All

References

Advisories & Patches

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

Exploits

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

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. It has a CVSS v3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-40885? +

CVE-2026-40885 has a CVSS v3.1 score of 8.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0006, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-40885? +

CVE-2026-40885 affects products from goshs, specifically: goshs. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-40885? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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