CVE-2026-34581 goshs has Auth Bypass via Share Token

What is CVE-2026-34581?

CVE-2026-34581 is a high-severity authentication bypass vulnerability in patrickhener goshs, published on 2 Apr 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

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.

Weakness: CWE-288

Which versions are affected by CVE-2026-34581?

3 open source packages ship an affected version, including github.com/patrickhener/goshs. It affects 1 product.

Products include Goshs Goshs.

How do I fix CVE-2026-34581?

Upgrade to a fixed version.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2026-34581 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-34581 exists.

Other vulnerabilities in patrickhener goshs

• CVE-2026-40884 goshs: Empty-username SFTP password authentication bypass in goshs Critical 9.8
• CVE-2026-35392 goshs has an Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in goshs PUT Upload Critical 9.8
• CVE-2026-35393 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in goshs POST multipart upload Critical 9.8
• CVE-2026-35471 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in goshs Critical 9.8
• CVE-2026-40189 goshs has a file-based ACL authorization bypass in goshs state-changing routes Critical 9.3

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-jgfx-74g2-9r6g, GO-2026-5469.